mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-27 09:05:18 +00:00
2451 lines
84 KiB
Go
2451 lines
84 KiB
Go
// Copyright 2011 The LevelDB-Go and Pebble Authors. All rights reserved. Use
|
|
// of this source code is governed by a BSD-style license that can be found in
|
|
// the LICENSE file.
|
|
|
|
package sstable
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"math"
|
|
"runtime"
|
|
"sort"
|
|
"sync"
|
|
|
|
"github.com/cespare/xxhash/v2"
|
|
"github.com/cockroachdb/errors"
|
|
"github.com/cockroachdb/pebble/internal/base"
|
|
"github.com/cockroachdb/pebble/internal/bytealloc"
|
|
"github.com/cockroachdb/pebble/internal/cache"
|
|
"github.com/cockroachdb/pebble/internal/crc"
|
|
"github.com/cockroachdb/pebble/internal/invariants"
|
|
"github.com/cockroachdb/pebble/internal/keyspan"
|
|
"github.com/cockroachdb/pebble/internal/private"
|
|
"github.com/cockroachdb/pebble/internal/rangekey"
|
|
"github.com/cockroachdb/pebble/objstorage"
|
|
)
|
|
|
|
// encodedBHPEstimatedSize estimates the size of the encoded BlockHandleWithProperties.
|
|
// It would also be nice to account for the length of the data block properties here,
|
|
// but isn't necessary since this is an estimate.
|
|
const encodedBHPEstimatedSize = binary.MaxVarintLen64 * 2
|
|
|
|
var errWriterClosed = errors.New("pebble: writer is closed")
|
|
|
|
// WriterMetadata holds info about a finished sstable.
|
|
type WriterMetadata struct {
|
|
Size uint64
|
|
SmallestPoint InternalKey
|
|
// LargestPoint, LargestRangeKey, LargestRangeDel should not be accessed
|
|
// before Writer.Close is called, because they may only be set on
|
|
// Writer.Close.
|
|
LargestPoint InternalKey
|
|
SmallestRangeDel InternalKey
|
|
LargestRangeDel InternalKey
|
|
SmallestRangeKey InternalKey
|
|
LargestRangeKey InternalKey
|
|
HasPointKeys bool
|
|
HasRangeDelKeys bool
|
|
HasRangeKeys bool
|
|
SmallestSeqNum uint64
|
|
LargestSeqNum uint64
|
|
Properties Properties
|
|
}
|
|
|
|
// SetSmallestPointKey sets the smallest point key to the given key.
|
|
// NB: this method set the "absolute" smallest point key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetSmallestPointKey(k InternalKey) {
|
|
m.SmallestPoint = k
|
|
m.HasPointKeys = true
|
|
}
|
|
|
|
// SetSmallestRangeDelKey sets the smallest rangedel key to the given key.
|
|
// NB: this method set the "absolute" smallest rangedel key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetSmallestRangeDelKey(k InternalKey) {
|
|
m.SmallestRangeDel = k
|
|
m.HasRangeDelKeys = true
|
|
}
|
|
|
|
// SetSmallestRangeKey sets the smallest range key to the given key.
|
|
// NB: this method set the "absolute" smallest range key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetSmallestRangeKey(k InternalKey) {
|
|
m.SmallestRangeKey = k
|
|
m.HasRangeKeys = true
|
|
}
|
|
|
|
// SetLargestPointKey sets the largest point key to the given key.
|
|
// NB: this method set the "absolute" largest point key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetLargestPointKey(k InternalKey) {
|
|
m.LargestPoint = k
|
|
m.HasPointKeys = true
|
|
}
|
|
|
|
// SetLargestRangeDelKey sets the largest rangedel key to the given key.
|
|
// NB: this method set the "absolute" largest rangedel key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetLargestRangeDelKey(k InternalKey) {
|
|
m.LargestRangeDel = k
|
|
m.HasRangeDelKeys = true
|
|
}
|
|
|
|
// SetLargestRangeKey sets the largest range key to the given key.
|
|
// NB: this method set the "absolute" largest range key. Any existing key is
|
|
// overridden.
|
|
func (m *WriterMetadata) SetLargestRangeKey(k InternalKey) {
|
|
m.LargestRangeKey = k
|
|
m.HasRangeKeys = true
|
|
}
|
|
|
|
func (m *WriterMetadata) updateSeqNum(seqNum uint64) {
|
|
if m.SmallestSeqNum > seqNum {
|
|
m.SmallestSeqNum = seqNum
|
|
}
|
|
if m.LargestSeqNum < seqNum {
|
|
m.LargestSeqNum = seqNum
|
|
}
|
|
}
|
|
|
|
// Writer is a table writer.
|
|
type Writer struct {
|
|
writable objstorage.Writable
|
|
meta WriterMetadata
|
|
err error
|
|
// cacheID and fileNum are used to remove blocks written to the sstable from
|
|
// the cache, providing a defense in depth against bugs which cause cache
|
|
// collisions.
|
|
cacheID uint64
|
|
fileNum base.DiskFileNum
|
|
// The following fields are copied from Options.
|
|
blockSize int
|
|
blockSizeThreshold int
|
|
indexBlockSize int
|
|
indexBlockSizeThreshold int
|
|
compare Compare
|
|
split Split
|
|
formatKey base.FormatKey
|
|
compression Compression
|
|
separator Separator
|
|
successor Successor
|
|
tableFormat TableFormat
|
|
isStrictObsolete bool
|
|
writingToLowestLevel bool
|
|
cache *cache.Cache
|
|
restartInterval int
|
|
checksumType ChecksumType
|
|
// disableKeyOrderChecks disables the checks that keys are added to an
|
|
// sstable in order. It is intended for internal use only in the construction
|
|
// of invalid sstables for testing. See tool/make_test_sstables.go.
|
|
disableKeyOrderChecks bool
|
|
// With two level indexes, the index/filter of a SST file is partitioned into
|
|
// smaller blocks with an additional top-level index on them. When reading an
|
|
// index/filter, only the top-level index is loaded into memory. The two level
|
|
// index/filter then uses the top-level index to load on demand into the block
|
|
// cache the partitions that are required to perform the index/filter query.
|
|
//
|
|
// Two level indexes are enabled automatically when there is more than one
|
|
// index block.
|
|
//
|
|
// This is useful when there are very large index blocks, which generally occurs
|
|
// with the usage of large keys. With large index blocks, the index blocks fight
|
|
// the data blocks for block cache space and the index blocks are likely to be
|
|
// re-read many times from the disk. The top level index, which has a much
|
|
// smaller memory footprint, can be used to prevent the entire index block from
|
|
// being loaded into the block cache.
|
|
twoLevelIndex bool
|
|
// Internal flag to allow creation of range-del-v1 format blocks. Only used
|
|
// for testing. Note that v2 format blocks are backwards compatible with v1
|
|
// format blocks.
|
|
rangeDelV1Format bool
|
|
indexBlock *indexBlockBuf
|
|
rangeDelBlock blockWriter
|
|
rangeKeyBlock blockWriter
|
|
topLevelIndexBlock blockWriter
|
|
props Properties
|
|
propCollectors []TablePropertyCollector
|
|
blockPropCollectors []BlockPropertyCollector
|
|
obsoleteCollector obsoleteKeyBlockPropertyCollector
|
|
blockPropsEncoder blockPropertiesEncoder
|
|
// filter accumulates the filter block. If populated, the filter ingests
|
|
// either the output of w.split (i.e. a prefix extractor) if w.split is not
|
|
// nil, or the full keys otherwise.
|
|
filter filterWriter
|
|
indexPartitions []indexBlockAndBlockProperties
|
|
|
|
// indexBlockAlloc is used to bulk-allocate byte slices used to store index
|
|
// blocks in indexPartitions. These live until the index finishes.
|
|
indexBlockAlloc []byte
|
|
// indexSepAlloc is used to bulk-allocate index block separator slices stored
|
|
// in indexPartitions. These live until the index finishes.
|
|
indexSepAlloc bytealloc.A
|
|
|
|
// To allow potentially overlapping (i.e. un-fragmented) range keys spans to
|
|
// be added to the Writer, a keyspan.Fragmenter is used to retain the keys
|
|
// and values, emitting fragmented, coalesced spans as appropriate. Range
|
|
// keys must be added in order of their start user-key.
|
|
fragmenter keyspan.Fragmenter
|
|
rangeKeyEncoder rangekey.Encoder
|
|
rangeKeysBySuffix keyspan.KeysBySuffix
|
|
rangeKeySpan keyspan.Span
|
|
rkBuf []byte
|
|
// dataBlockBuf consists of the state which is currently owned by and used by
|
|
// the Writer client goroutine. This state can be handed off to other goroutines.
|
|
dataBlockBuf *dataBlockBuf
|
|
// blockBuf consists of the state which is owned by and used by the Writer client
|
|
// goroutine.
|
|
blockBuf blockBuf
|
|
|
|
coordination coordinationState
|
|
|
|
// Information (other than the byte slice) about the last point key, to
|
|
// avoid extracting it again.
|
|
lastPointKeyInfo pointKeyInfo
|
|
|
|
// For value blocks.
|
|
shortAttributeExtractor base.ShortAttributeExtractor
|
|
requiredInPlaceValueBound UserKeyPrefixBound
|
|
valueBlockWriter *valueBlockWriter
|
|
}
|
|
|
|
type pointKeyInfo struct {
|
|
trailer uint64
|
|
// Only computed when w.valueBlockWriter is not nil.
|
|
userKeyLen int
|
|
// prefixLen uses w.split, if not nil. Only computed when w.valueBlockWriter
|
|
// is not nil.
|
|
prefixLen int
|
|
// True iff the point was marked obsolete.
|
|
isObsolete bool
|
|
}
|
|
|
|
type coordinationState struct {
|
|
parallelismEnabled bool
|
|
|
|
// writeQueue is used to write data blocks to disk. The writeQueue is primarily
|
|
// used to maintain the order in which data blocks must be written to disk. For
|
|
// this reason, every single data block write must be done through the writeQueue.
|
|
writeQueue *writeQueue
|
|
|
|
sizeEstimate dataBlockEstimates
|
|
}
|
|
|
|
func (c *coordinationState) init(parallelismEnabled bool, writer *Writer) {
|
|
c.parallelismEnabled = parallelismEnabled
|
|
// useMutex is false regardless of parallelismEnabled, because we do not do
|
|
// parallel compression yet.
|
|
c.sizeEstimate.useMutex = false
|
|
|
|
// writeQueueSize determines the size of the write queue, or the number
|
|
// of items which can be added to the queue without blocking. By default, we
|
|
// use a writeQueue size of 0, since we won't be doing any block writes in
|
|
// parallel.
|
|
writeQueueSize := 0
|
|
if parallelismEnabled {
|
|
writeQueueSize = runtime.GOMAXPROCS(0)
|
|
}
|
|
c.writeQueue = newWriteQueue(writeQueueSize, writer)
|
|
}
|
|
|
|
// sizeEstimate is a general purpose helper for estimating two kinds of sizes:
|
|
// A. The compressed sstable size, which is useful for deciding when to start
|
|
//
|
|
// a new sstable during flushes or compactions. In practice, we use this in
|
|
// estimating the data size (excluding the index).
|
|
//
|
|
// B. The size of index blocks to decide when to start a new index block.
|
|
//
|
|
// There are some terminology peculiarities which are due to the origin of
|
|
// sizeEstimate for use case A with parallel compression enabled (for which
|
|
// the code has not been merged). Specifically this relates to the terms
|
|
// "written" and "compressed".
|
|
// - The notion of "written" for case A is sufficiently defined by saying that
|
|
// the data block is compressed. Waiting for the actual data block write to
|
|
// happen can result in unnecessary estimation, when we already know how big
|
|
// it will be in compressed form. Additionally, with the forthcoming value
|
|
// blocks containing older MVCC values, these compressed block will be held
|
|
// in-memory until late in the sstable writing, and we do want to accurately
|
|
// account for them without waiting for the actual write.
|
|
// For case B, "written" means that the index entry has been fully
|
|
// generated, and has been added to the uncompressed block buffer for that
|
|
// index block. It does not include actually writing a potentially
|
|
// compressed index block.
|
|
// - The notion of "compressed" is to differentiate between a "inflight" size
|
|
// and the actual size, and is handled via computing a compression ratio
|
|
// observed so far (defaults to 1).
|
|
// For case A, this is actual data block compression, so the "inflight" size
|
|
// is uncompressed blocks (that are no longer being written to) and the
|
|
// "compressed" size is after they have been compressed.
|
|
// For case B the inflight size is for a key-value pair in the index for
|
|
// which the value size (the encoded size of the BlockHandleWithProperties)
|
|
// is not accurately known, while the compressed size is the size of that
|
|
// entry when it has been added to the (in-progress) index ssblock.
|
|
//
|
|
// Usage: To update state, one can optionally provide an inflight write value
|
|
// using addInflight (used for case B). When something is "written" the state
|
|
// can be updated using either writtenWithDelta or writtenWithTotal, which
|
|
// provide the actual delta size or the total size (latter must be
|
|
// monotonically non-decreasing). If there were no calls to addInflight, there
|
|
// isn't any real estimation happening here. So case A does not do any real
|
|
// estimation. However, when we introduce parallel compression, there will be
|
|
// estimation in that the client goroutine will call addInFlight and the
|
|
// compression goroutines will call writtenWithDelta.
|
|
type sizeEstimate struct {
|
|
// emptySize is the size when there is no inflight data, and numEntries is 0.
|
|
// emptySize is constant once set.
|
|
emptySize uint64
|
|
|
|
// inflightSize is the estimated size of some inflight data which hasn't
|
|
// been written yet.
|
|
inflightSize uint64
|
|
|
|
// totalSize is the total size of the data which has already been written.
|
|
totalSize uint64
|
|
|
|
// numWrittenEntries is the total number of entries which have already been
|
|
// written.
|
|
numWrittenEntries uint64
|
|
// numInflightEntries is the total number of entries which are inflight, and
|
|
// haven't been written.
|
|
numInflightEntries uint64
|
|
|
|
// maxEstimatedSize stores the maximum result returned from sizeEstimate.size.
|
|
// It ensures that values returned from subsequent calls to Writer.EstimatedSize
|
|
// never decrease.
|
|
maxEstimatedSize uint64
|
|
|
|
// We assume that the entries added to the sizeEstimate can be compressed.
|
|
// For this reason, we keep track of a compressedSize and an uncompressedSize
|
|
// to compute a compression ratio for the inflight entries. If the entries
|
|
// aren't being compressed, then compressedSize and uncompressedSize must be
|
|
// equal.
|
|
compressedSize uint64
|
|
uncompressedSize uint64
|
|
}
|
|
|
|
func (s *sizeEstimate) init(emptySize uint64) {
|
|
s.emptySize = emptySize
|
|
}
|
|
|
|
func (s *sizeEstimate) size() uint64 {
|
|
ratio := float64(1)
|
|
if s.uncompressedSize > 0 {
|
|
ratio = float64(s.compressedSize) / float64(s.uncompressedSize)
|
|
}
|
|
estimatedInflightSize := uint64(float64(s.inflightSize) * ratio)
|
|
total := s.totalSize + estimatedInflightSize
|
|
if total > s.maxEstimatedSize {
|
|
s.maxEstimatedSize = total
|
|
} else {
|
|
total = s.maxEstimatedSize
|
|
}
|
|
|
|
if total == 0 {
|
|
return s.emptySize
|
|
}
|
|
|
|
return total
|
|
}
|
|
|
|
func (s *sizeEstimate) numTotalEntries() uint64 {
|
|
return s.numWrittenEntries + s.numInflightEntries
|
|
}
|
|
|
|
func (s *sizeEstimate) addInflight(size int) {
|
|
s.numInflightEntries++
|
|
s.inflightSize += uint64(size)
|
|
}
|
|
|
|
func (s *sizeEstimate) writtenWithTotal(newTotalSize uint64, inflightSize int) {
|
|
finalEntrySize := int(newTotalSize - s.totalSize)
|
|
s.writtenWithDelta(finalEntrySize, inflightSize)
|
|
}
|
|
|
|
func (s *sizeEstimate) writtenWithDelta(finalEntrySize int, inflightSize int) {
|
|
if inflightSize > 0 {
|
|
// This entry was previously inflight, so we should decrement inflight
|
|
// entries and update the "compression" stats for future estimation.
|
|
s.numInflightEntries--
|
|
s.inflightSize -= uint64(inflightSize)
|
|
s.uncompressedSize += uint64(inflightSize)
|
|
s.compressedSize += uint64(finalEntrySize)
|
|
}
|
|
s.numWrittenEntries++
|
|
s.totalSize += uint64(finalEntrySize)
|
|
}
|
|
|
|
func (s *sizeEstimate) clear() {
|
|
*s = sizeEstimate{emptySize: s.emptySize}
|
|
}
|
|
|
|
type indexBlockBuf struct {
|
|
// block will only be accessed from the writeQueue.
|
|
block blockWriter
|
|
|
|
size struct {
|
|
useMutex bool
|
|
mu sync.Mutex
|
|
estimate sizeEstimate
|
|
}
|
|
|
|
// restartInterval matches indexBlockBuf.block.restartInterval. We store it twice, because the `block`
|
|
// must only be accessed from the writeQueue goroutine.
|
|
restartInterval int
|
|
}
|
|
|
|
func (i *indexBlockBuf) clear() {
|
|
i.block.clear()
|
|
if i.size.useMutex {
|
|
i.size.mu.Lock()
|
|
defer i.size.mu.Unlock()
|
|
}
|
|
i.size.estimate.clear()
|
|
i.restartInterval = 0
|
|
}
|
|
|
|
var indexBlockBufPool = sync.Pool{
|
|
New: func() interface{} {
|
|
return &indexBlockBuf{}
|
|
},
|
|
}
|
|
|
|
const indexBlockRestartInterval = 1
|
|
|
|
func newIndexBlockBuf(useMutex bool) *indexBlockBuf {
|
|
i := indexBlockBufPool.Get().(*indexBlockBuf)
|
|
i.size.useMutex = useMutex
|
|
i.restartInterval = indexBlockRestartInterval
|
|
i.block.restartInterval = indexBlockRestartInterval
|
|
i.size.estimate.init(emptyBlockSize)
|
|
return i
|
|
}
|
|
|
|
func (i *indexBlockBuf) shouldFlush(
|
|
sep InternalKey, valueLen, targetBlockSize, sizeThreshold int,
|
|
) bool {
|
|
if i.size.useMutex {
|
|
i.size.mu.Lock()
|
|
defer i.size.mu.Unlock()
|
|
}
|
|
|
|
nEntries := i.size.estimate.numTotalEntries()
|
|
return shouldFlush(
|
|
sep, valueLen, i.restartInterval, int(i.size.estimate.size()),
|
|
int(nEntries), targetBlockSize, sizeThreshold)
|
|
}
|
|
|
|
func (i *indexBlockBuf) add(key InternalKey, value []byte, inflightSize int) {
|
|
i.block.add(key, value)
|
|
size := i.block.estimatedSize()
|
|
if i.size.useMutex {
|
|
i.size.mu.Lock()
|
|
defer i.size.mu.Unlock()
|
|
}
|
|
i.size.estimate.writtenWithTotal(uint64(size), inflightSize)
|
|
}
|
|
|
|
func (i *indexBlockBuf) finish() []byte {
|
|
b := i.block.finish()
|
|
return b
|
|
}
|
|
|
|
func (i *indexBlockBuf) addInflight(inflightSize int) {
|
|
if i.size.useMutex {
|
|
i.size.mu.Lock()
|
|
defer i.size.mu.Unlock()
|
|
}
|
|
i.size.estimate.addInflight(inflightSize)
|
|
}
|
|
|
|
func (i *indexBlockBuf) estimatedSize() uint64 {
|
|
if i.size.useMutex {
|
|
i.size.mu.Lock()
|
|
defer i.size.mu.Unlock()
|
|
}
|
|
|
|
// Make sure that the size estimation works as expected when parallelism
|
|
// is disabled.
|
|
if invariants.Enabled && !i.size.useMutex {
|
|
if i.size.estimate.inflightSize != 0 {
|
|
panic("unexpected inflight entry in index block size estimation")
|
|
}
|
|
|
|
// NB: The i.block should only be accessed from the writeQueue goroutine,
|
|
// when parallelism is enabled. We break that invariant here, but that's
|
|
// okay since parallelism is disabled.
|
|
if i.size.estimate.size() != uint64(i.block.estimatedSize()) {
|
|
panic("index block size estimation sans parallelism is incorrect")
|
|
}
|
|
}
|
|
return i.size.estimate.size()
|
|
}
|
|
|
|
// sizeEstimate is used for sstable size estimation. sizeEstimate can be
|
|
// accessed by the Writer client and compressionQueue goroutines. Fields
|
|
// should only be read/updated through the functions defined on the
|
|
// *sizeEstimate type.
|
|
type dataBlockEstimates struct {
|
|
// If we don't do block compression in parallel, then we don't need to take
|
|
// the performance hit of synchronizing using this mutex.
|
|
useMutex bool
|
|
mu sync.Mutex
|
|
|
|
estimate sizeEstimate
|
|
}
|
|
|
|
// inflightSize is the uncompressed block size estimate which has been
|
|
// previously provided to addInflightDataBlock(). If addInflightDataBlock()
|
|
// has not been called, this must be set to 0. compressedSize is the
|
|
// compressed size of the block.
|
|
func (d *dataBlockEstimates) dataBlockCompressed(compressedSize int, inflightSize int) {
|
|
if d.useMutex {
|
|
d.mu.Lock()
|
|
defer d.mu.Unlock()
|
|
}
|
|
d.estimate.writtenWithDelta(compressedSize+blockTrailerLen, inflightSize)
|
|
}
|
|
|
|
// size is an estimated size of datablock data which has been written to disk.
|
|
func (d *dataBlockEstimates) size() uint64 {
|
|
if d.useMutex {
|
|
d.mu.Lock()
|
|
defer d.mu.Unlock()
|
|
}
|
|
// If there is no parallel compression, there should not be any inflight bytes.
|
|
if invariants.Enabled && !d.useMutex {
|
|
if d.estimate.inflightSize != 0 {
|
|
panic("unexpected inflight entry in data block size estimation")
|
|
}
|
|
}
|
|
return d.estimate.size()
|
|
}
|
|
|
|
// Avoid linter unused error.
|
|
var _ = (&dataBlockEstimates{}).addInflightDataBlock
|
|
|
|
// NB: unused since no parallel compression.
|
|
func (d *dataBlockEstimates) addInflightDataBlock(size int) {
|
|
if d.useMutex {
|
|
d.mu.Lock()
|
|
defer d.mu.Unlock()
|
|
}
|
|
|
|
d.estimate.addInflight(size)
|
|
}
|
|
|
|
var writeTaskPool = sync.Pool{
|
|
New: func() interface{} {
|
|
t := &writeTask{}
|
|
t.compressionDone = make(chan bool, 1)
|
|
return t
|
|
},
|
|
}
|
|
|
|
type checksummer struct {
|
|
checksumType ChecksumType
|
|
xxHasher *xxhash.Digest
|
|
}
|
|
|
|
func (c *checksummer) checksum(block []byte, blockType []byte) (checksum uint32) {
|
|
// Calculate the checksum.
|
|
switch c.checksumType {
|
|
case ChecksumTypeCRC32c:
|
|
checksum = crc.New(block).Update(blockType).Value()
|
|
case ChecksumTypeXXHash64:
|
|
if c.xxHasher == nil {
|
|
c.xxHasher = xxhash.New()
|
|
} else {
|
|
c.xxHasher.Reset()
|
|
}
|
|
c.xxHasher.Write(block)
|
|
c.xxHasher.Write(blockType)
|
|
checksum = uint32(c.xxHasher.Sum64())
|
|
default:
|
|
panic(errors.Newf("unsupported checksum type: %d", c.checksumType))
|
|
}
|
|
return checksum
|
|
}
|
|
|
|
type blockBuf struct {
|
|
// tmp is a scratch buffer, large enough to hold either footerLen bytes,
|
|
// blockTrailerLen bytes, (5 * binary.MaxVarintLen64) bytes, and most
|
|
// likely large enough for a block handle with properties.
|
|
tmp [blockHandleLikelyMaxLen]byte
|
|
// compressedBuf is the destination buffer for compression. It is re-used over the
|
|
// lifetime of the blockBuf, avoiding the allocation of a temporary buffer for each block.
|
|
compressedBuf []byte
|
|
checksummer checksummer
|
|
}
|
|
|
|
func (b *blockBuf) clear() {
|
|
// We can't assign b.compressedBuf[:0] to compressedBuf because snappy relies
|
|
// on the length of the buffer, and not the capacity to determine if it needs
|
|
// to make an allocation.
|
|
*b = blockBuf{
|
|
compressedBuf: b.compressedBuf, checksummer: b.checksummer,
|
|
}
|
|
}
|
|
|
|
// A dataBlockBuf holds all the state required to compress and write a data block to disk.
|
|
// A dataBlockBuf begins its lifecycle owned by the Writer client goroutine. The Writer
|
|
// client goroutine adds keys to the sstable, writing directly into a dataBlockBuf's blockWriter
|
|
// until the block is full. Once a dataBlockBuf's block is full, the dataBlockBuf may be passed
|
|
// to other goroutines for compression and file I/O.
|
|
type dataBlockBuf struct {
|
|
blockBuf
|
|
dataBlock blockWriter
|
|
|
|
// uncompressed is a reference to a byte slice which is owned by the dataBlockBuf. It is the
|
|
// next byte slice to be compressed. The uncompressed byte slice will be backed by the
|
|
// dataBlock.buf.
|
|
uncompressed []byte
|
|
// compressed is a reference to a byte slice which is owned by the dataBlockBuf. It is the
|
|
// compressed byte slice which must be written to disk. The compressed byte slice may be
|
|
// backed by the dataBlock.buf, or the dataBlockBuf.compressedBuf, depending on whether
|
|
// we use the result of the compression.
|
|
compressed []byte
|
|
|
|
// We're making calls to BlockPropertyCollectors from the Writer client goroutine. We need to
|
|
// pass the encoded block properties over to the write queue. To prevent copies, and allocations,
|
|
// we give each dataBlockBuf, a blockPropertiesEncoder.
|
|
blockPropsEncoder blockPropertiesEncoder
|
|
// dataBlockProps is set when Writer.finishDataBlockProps is called. The dataBlockProps slice is
|
|
// a shallow copy of the internal buffer of the dataBlockBuf.blockPropsEncoder.
|
|
dataBlockProps []byte
|
|
|
|
// sepScratch is reusable scratch space for computing separator keys.
|
|
sepScratch []byte
|
|
}
|
|
|
|
func (d *dataBlockBuf) clear() {
|
|
d.blockBuf.clear()
|
|
d.dataBlock.clear()
|
|
|
|
d.uncompressed = nil
|
|
d.compressed = nil
|
|
d.dataBlockProps = nil
|
|
d.sepScratch = d.sepScratch[:0]
|
|
}
|
|
|
|
var dataBlockBufPool = sync.Pool{
|
|
New: func() interface{} {
|
|
return &dataBlockBuf{}
|
|
},
|
|
}
|
|
|
|
func newDataBlockBuf(restartInterval int, checksumType ChecksumType) *dataBlockBuf {
|
|
d := dataBlockBufPool.Get().(*dataBlockBuf)
|
|
d.dataBlock.restartInterval = restartInterval
|
|
d.checksummer.checksumType = checksumType
|
|
return d
|
|
}
|
|
|
|
func (d *dataBlockBuf) finish() {
|
|
d.uncompressed = d.dataBlock.finish()
|
|
}
|
|
|
|
func (d *dataBlockBuf) compressAndChecksum(c Compression) {
|
|
d.compressed = compressAndChecksum(d.uncompressed, c, &d.blockBuf)
|
|
}
|
|
|
|
func (d *dataBlockBuf) shouldFlush(
|
|
key InternalKey, valueLen, targetBlockSize, sizeThreshold int,
|
|
) bool {
|
|
return shouldFlush(
|
|
key, valueLen, d.dataBlock.restartInterval, d.dataBlock.estimatedSize(),
|
|
d.dataBlock.nEntries, targetBlockSize, sizeThreshold)
|
|
}
|
|
|
|
type indexBlockAndBlockProperties struct {
|
|
nEntries int
|
|
// sep is the last key added to this block, for computing a separator later.
|
|
sep InternalKey
|
|
properties []byte
|
|
// block is the encoded block produced by blockWriter.finish.
|
|
block []byte
|
|
}
|
|
|
|
// Set sets the value for the given key. The sequence number is set to 0.
|
|
// Intended for use to externally construct an sstable before ingestion into a
|
|
// DB. For a given Writer, the keys passed to Set must be in strictly increasing
|
|
// order.
|
|
//
|
|
// TODO(peter): untested
|
|
func (w *Writer) Set(key, value []byte) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
if w.isStrictObsolete {
|
|
return errors.Errorf("use AddWithForceObsolete")
|
|
}
|
|
// forceObsolete is false based on the assumption that no RANGEDELs in the
|
|
// sstable delete the added points.
|
|
return w.addPoint(base.MakeInternalKey(key, 0, InternalKeyKindSet), value, false)
|
|
}
|
|
|
|
// Delete deletes the value for the given key. The sequence number is set to
|
|
// 0. Intended for use to externally construct an sstable before ingestion into
|
|
// a DB.
|
|
//
|
|
// TODO(peter): untested
|
|
func (w *Writer) Delete(key []byte) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
if w.isStrictObsolete {
|
|
return errors.Errorf("use AddWithForceObsolete")
|
|
}
|
|
// forceObsolete is false based on the assumption that no RANGEDELs in the
|
|
// sstable delete the added points.
|
|
return w.addPoint(base.MakeInternalKey(key, 0, InternalKeyKindDelete), nil, false)
|
|
}
|
|
|
|
// DeleteRange deletes all of the keys (and values) in the range [start,end)
|
|
// (inclusive on start, exclusive on end). The sequence number is set to
|
|
// 0. Intended for use to externally construct an sstable before ingestion into
|
|
// a DB.
|
|
//
|
|
// TODO(peter): untested
|
|
func (w *Writer) DeleteRange(start, end []byte) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
return w.addTombstone(base.MakeInternalKey(start, 0, InternalKeyKindRangeDelete), end)
|
|
}
|
|
|
|
// Merge adds an action to the DB that merges the value at key with the new
|
|
// value. The details of the merge are dependent upon the configured merge
|
|
// operator. The sequence number is set to 0. Intended for use to externally
|
|
// construct an sstable before ingestion into a DB.
|
|
//
|
|
// TODO(peter): untested
|
|
func (w *Writer) Merge(key, value []byte) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
if w.isStrictObsolete {
|
|
return errors.Errorf("use AddWithForceObsolete")
|
|
}
|
|
// forceObsolete is false based on the assumption that no RANGEDELs in the
|
|
// sstable that delete the added points. If the user configured this writer
|
|
// to be strict-obsolete, addPoint will reject the addition of this MERGE.
|
|
return w.addPoint(base.MakeInternalKey(key, 0, InternalKeyKindMerge), value, false)
|
|
}
|
|
|
|
// Add adds a key/value pair to the table being written. For a given Writer,
|
|
// the keys passed to Add must be in increasing order. The exception to this
|
|
// rule is range deletion tombstones. Range deletion tombstones need to be
|
|
// added ordered by their start key, but they can be added out of order from
|
|
// point entries. Additionally, range deletion tombstones must be fragmented
|
|
// (i.e. by keyspan.Fragmenter).
|
|
func (w *Writer) Add(key InternalKey, value []byte) error {
|
|
if w.isStrictObsolete {
|
|
return errors.Errorf("use AddWithForceObsolete")
|
|
}
|
|
return w.AddWithForceObsolete(key, value, false)
|
|
}
|
|
|
|
// AddWithForceObsolete must be used when writing a strict-obsolete sstable.
|
|
//
|
|
// forceObsolete indicates whether the caller has determined that this key is
|
|
// obsolete even though it may be the latest point key for this userkey. This
|
|
// should be set to true for keys obsoleted by RANGEDELs, and is required for
|
|
// strict-obsolete sstables.
|
|
//
|
|
// Note that there are two properties, S1 and S2 (see comment in format.go)
|
|
// that strict-obsolete ssts must satisfy. S2, due to RANGEDELs, is solely the
|
|
// responsibility of the caller. S1 is solely the responsibility of the
|
|
// callee.
|
|
func (w *Writer) AddWithForceObsolete(key InternalKey, value []byte, forceObsolete bool) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
|
|
switch key.Kind() {
|
|
case InternalKeyKindRangeDelete:
|
|
return w.addTombstone(key, value)
|
|
case base.InternalKeyKindRangeKeyDelete,
|
|
base.InternalKeyKindRangeKeySet,
|
|
base.InternalKeyKindRangeKeyUnset:
|
|
w.err = errors.Errorf(
|
|
"pebble: range keys must be added via one of the RangeKey* functions")
|
|
return w.err
|
|
}
|
|
return w.addPoint(key, value, forceObsolete)
|
|
}
|
|
|
|
func (w *Writer) makeAddPointDecisionV2(key InternalKey) error {
|
|
prevTrailer := w.lastPointKeyInfo.trailer
|
|
w.lastPointKeyInfo.trailer = key.Trailer
|
|
if w.dataBlockBuf.dataBlock.nEntries == 0 {
|
|
return nil
|
|
}
|
|
if !w.disableKeyOrderChecks {
|
|
prevPointUserKey := w.dataBlockBuf.dataBlock.getCurUserKey()
|
|
cmpUser := w.compare(prevPointUserKey, key.UserKey)
|
|
if cmpUser > 0 || (cmpUser == 0 && prevTrailer <= key.Trailer) {
|
|
return errors.Errorf(
|
|
"pebble: keys must be added in strictly increasing order: %s, %s",
|
|
InternalKey{UserKey: prevPointUserKey, Trailer: prevTrailer}.Pretty(w.formatKey),
|
|
key.Pretty(w.formatKey))
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// REQUIRES: at least one point has been written to the Writer.
|
|
func (w *Writer) getLastPointUserKey() []byte {
|
|
if w.dataBlockBuf.dataBlock.nEntries == 0 {
|
|
panic(errors.AssertionFailedf("no point keys added to writer"))
|
|
}
|
|
return w.dataBlockBuf.dataBlock.getCurUserKey()
|
|
}
|
|
|
|
func (w *Writer) makeAddPointDecisionV3(
|
|
key InternalKey, valueLen int,
|
|
) (setHasSamePrefix bool, writeToValueBlock bool, isObsolete bool, err error) {
|
|
prevPointKeyInfo := w.lastPointKeyInfo
|
|
w.lastPointKeyInfo.userKeyLen = len(key.UserKey)
|
|
w.lastPointKeyInfo.prefixLen = w.lastPointKeyInfo.userKeyLen
|
|
if w.split != nil {
|
|
w.lastPointKeyInfo.prefixLen = w.split(key.UserKey)
|
|
}
|
|
w.lastPointKeyInfo.trailer = key.Trailer
|
|
w.lastPointKeyInfo.isObsolete = false
|
|
if !w.meta.HasPointKeys {
|
|
return false, false, false, nil
|
|
}
|
|
keyKind := base.TrailerKind(key.Trailer)
|
|
prevPointUserKey := w.getLastPointUserKey()
|
|
prevPointKey := InternalKey{UserKey: prevPointUserKey, Trailer: prevPointKeyInfo.trailer}
|
|
prevKeyKind := base.TrailerKind(prevPointKeyInfo.trailer)
|
|
considerWriteToValueBlock := prevKeyKind == InternalKeyKindSet &&
|
|
keyKind == InternalKeyKindSet
|
|
if considerWriteToValueBlock && !w.requiredInPlaceValueBound.IsEmpty() {
|
|
keyPrefix := key.UserKey[:w.lastPointKeyInfo.prefixLen]
|
|
cmpUpper := w.compare(
|
|
w.requiredInPlaceValueBound.Upper, keyPrefix)
|
|
if cmpUpper <= 0 {
|
|
// Common case for CockroachDB. Make it empty since all future keys in
|
|
// this sstable will also have cmpUpper <= 0.
|
|
w.requiredInPlaceValueBound = UserKeyPrefixBound{}
|
|
} else if w.compare(keyPrefix, w.requiredInPlaceValueBound.Lower) >= 0 {
|
|
considerWriteToValueBlock = false
|
|
}
|
|
}
|
|
// cmpPrefix is initialized iff considerWriteToValueBlock.
|
|
var cmpPrefix int
|
|
var cmpUser int
|
|
if considerWriteToValueBlock {
|
|
// Compare the prefixes.
|
|
cmpPrefix = w.compare(prevPointUserKey[:prevPointKeyInfo.prefixLen],
|
|
key.UserKey[:w.lastPointKeyInfo.prefixLen])
|
|
cmpUser = cmpPrefix
|
|
if cmpPrefix == 0 {
|
|
// Need to compare suffixes to compute cmpUser.
|
|
cmpUser = w.compare(prevPointUserKey[prevPointKeyInfo.prefixLen:],
|
|
key.UserKey[w.lastPointKeyInfo.prefixLen:])
|
|
}
|
|
} else {
|
|
cmpUser = w.compare(prevPointUserKey, key.UserKey)
|
|
}
|
|
// Ensure that no one adds a point key kind without considering the obsolete
|
|
// handling for that kind.
|
|
switch keyKind {
|
|
case InternalKeyKindSet, InternalKeyKindSetWithDelete, InternalKeyKindMerge,
|
|
InternalKeyKindDelete, InternalKeyKindSingleDelete, InternalKeyKindDeleteSized:
|
|
default:
|
|
panic(errors.AssertionFailedf("unexpected key kind %s", keyKind.String()))
|
|
}
|
|
// If same user key, then the current key is obsolete if any of the
|
|
// following is true:
|
|
// C1 The prev key was obsolete.
|
|
// C2 The prev key was not a MERGE. When the previous key is a MERGE we must
|
|
// preserve SET* and MERGE since their values will be merged into the
|
|
// previous key. We also must preserve DEL* since there may be an older
|
|
// SET*/MERGE in a lower level that must not be merged with the MERGE --
|
|
// if we omit the DEL* that lower SET*/MERGE will become visible.
|
|
//
|
|
// Regardless of whether it is the same user key or not
|
|
// C3 The current key is some kind of point delete, and we are writing to
|
|
// the lowest level, then it is also obsolete. The correctness of this
|
|
// relies on the same user key not spanning multiple sstables in a level.
|
|
//
|
|
// C1 ensures that for a user key there is at most one transition from
|
|
// !obsolete to obsolete. Consider a user key k, for which the first n keys
|
|
// are not obsolete. We consider the various value of n:
|
|
//
|
|
// n = 0: This happens due to forceObsolete being set by the caller, or due
|
|
// to C3. forceObsolete must only be set due a RANGEDEL, and that RANGEDEL
|
|
// must also delete all the lower seqnums for the same user key. C3 triggers
|
|
// due to a point delete and that deletes all the lower seqnums for the same
|
|
// user key.
|
|
//
|
|
// n = 1: This is the common case. It happens when the first key is not a
|
|
// MERGE, or the current key is some kind of point delete.
|
|
//
|
|
// n > 1: This is due to a sequence of MERGE keys, potentially followed by a
|
|
// single non-MERGE key.
|
|
isObsoleteC1AndC2 := cmpUser == 0 &&
|
|
(prevPointKeyInfo.isObsolete || prevKeyKind != InternalKeyKindMerge)
|
|
isObsoleteC3 := w.writingToLowestLevel &&
|
|
(keyKind == InternalKeyKindDelete || keyKind == InternalKeyKindSingleDelete ||
|
|
keyKind == InternalKeyKindDeleteSized)
|
|
isObsolete = isObsoleteC1AndC2 || isObsoleteC3
|
|
// TODO(sumeer): storing isObsolete SET and SETWITHDEL in value blocks is
|
|
// possible, but requires some care in documenting and checking invariants.
|
|
// There is code that assumes nothing in value blocks because of single MVCC
|
|
// version (those should be ok). We have to ensure setHasSamePrefix is
|
|
// correctly initialized here etc.
|
|
|
|
if !w.disableKeyOrderChecks &&
|
|
(cmpUser > 0 || (cmpUser == 0 && prevPointKeyInfo.trailer <= key.Trailer)) {
|
|
return false, false, false, errors.Errorf(
|
|
"pebble: keys must be added in strictly increasing order: %s, %s",
|
|
prevPointKey.Pretty(w.formatKey), key.Pretty(w.formatKey))
|
|
}
|
|
if !considerWriteToValueBlock {
|
|
return false, false, isObsolete, nil
|
|
}
|
|
// NB: it is possible that cmpUser == 0, i.e., these two SETs have identical
|
|
// user keys (because of an open snapshot). This should be the rare case.
|
|
setHasSamePrefix = cmpPrefix == 0
|
|
considerWriteToValueBlock = setHasSamePrefix
|
|
// Use of 0 here is somewhat arbitrary. Given the minimum 3 byte encoding of
|
|
// valueHandle, this should be > 3. But tiny values are common in test and
|
|
// unlikely in production, so we use 0 here for better test coverage.
|
|
const tinyValueThreshold = 0
|
|
if considerWriteToValueBlock && valueLen <= tinyValueThreshold {
|
|
considerWriteToValueBlock = false
|
|
}
|
|
return setHasSamePrefix, considerWriteToValueBlock, isObsolete, nil
|
|
}
|
|
|
|
func (w *Writer) addPoint(key InternalKey, value []byte, forceObsolete bool) error {
|
|
if w.isStrictObsolete && key.Kind() == InternalKeyKindMerge {
|
|
return errors.Errorf("MERGE not supported in a strict-obsolete sstable")
|
|
}
|
|
var err error
|
|
var setHasSameKeyPrefix, writeToValueBlock, addPrefixToValueStoredWithKey bool
|
|
var isObsolete bool
|
|
maxSharedKeyLen := len(key.UserKey)
|
|
if w.valueBlockWriter != nil {
|
|
// maxSharedKeyLen is limited to the prefix of the preceding key. If the
|
|
// preceding key was in a different block, then the blockWriter will
|
|
// ignore this maxSharedKeyLen.
|
|
maxSharedKeyLen = w.lastPointKeyInfo.prefixLen
|
|
setHasSameKeyPrefix, writeToValueBlock, isObsolete, err =
|
|
w.makeAddPointDecisionV3(key, len(value))
|
|
addPrefixToValueStoredWithKey = base.TrailerKind(key.Trailer) == InternalKeyKindSet
|
|
} else {
|
|
err = w.makeAddPointDecisionV2(key)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
isObsolete = w.tableFormat >= TableFormatPebblev4 && (isObsolete || forceObsolete)
|
|
w.lastPointKeyInfo.isObsolete = isObsolete
|
|
var valueStoredWithKey []byte
|
|
var prefix valuePrefix
|
|
var valueStoredWithKeyLen int
|
|
if writeToValueBlock {
|
|
vh, err := w.valueBlockWriter.addValue(value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
n := encodeValueHandle(w.blockBuf.tmp[:], vh)
|
|
valueStoredWithKey = w.blockBuf.tmp[:n]
|
|
valueStoredWithKeyLen = len(valueStoredWithKey) + 1
|
|
var attribute base.ShortAttribute
|
|
if w.shortAttributeExtractor != nil {
|
|
// TODO(sumeer): for compactions, it is possible that the input sstable
|
|
// already has this value in the value section and so we have already
|
|
// extracted the ShortAttribute. Avoid extracting it again. This will
|
|
// require changing the Writer.Add interface.
|
|
if attribute, err = w.shortAttributeExtractor(
|
|
key.UserKey, w.lastPointKeyInfo.prefixLen, value); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
prefix = makePrefixForValueHandle(setHasSameKeyPrefix, attribute)
|
|
} else {
|
|
valueStoredWithKey = value
|
|
valueStoredWithKeyLen = len(value)
|
|
if addPrefixToValueStoredWithKey {
|
|
valueStoredWithKeyLen++
|
|
}
|
|
prefix = makePrefixForInPlaceValue(setHasSameKeyPrefix)
|
|
}
|
|
|
|
if err := w.maybeFlush(key, valueStoredWithKeyLen); err != nil {
|
|
return err
|
|
}
|
|
|
|
for i := range w.propCollectors {
|
|
if err := w.propCollectors[i].Add(key, value); err != nil {
|
|
w.err = err
|
|
return err
|
|
}
|
|
}
|
|
for i := range w.blockPropCollectors {
|
|
v := value
|
|
if addPrefixToValueStoredWithKey {
|
|
// Values for SET are not required to be in-place, and in the future may
|
|
// not even be read by the compaction, so pass nil values. Block
|
|
// property collectors in such Pebble DB's must not look at the value.
|
|
v = nil
|
|
}
|
|
if err := w.blockPropCollectors[i].Add(key, v); err != nil {
|
|
w.err = err
|
|
return err
|
|
}
|
|
}
|
|
if w.tableFormat >= TableFormatPebblev4 {
|
|
w.obsoleteCollector.AddPoint(isObsolete)
|
|
}
|
|
|
|
w.maybeAddToFilter(key.UserKey)
|
|
w.dataBlockBuf.dataBlock.addWithOptionalValuePrefix(
|
|
key, isObsolete, valueStoredWithKey, maxSharedKeyLen, addPrefixToValueStoredWithKey, prefix,
|
|
setHasSameKeyPrefix)
|
|
|
|
w.meta.updateSeqNum(key.SeqNum())
|
|
|
|
if !w.meta.HasPointKeys {
|
|
k := w.dataBlockBuf.dataBlock.getCurKey()
|
|
// NB: We need to ensure that SmallestPoint.UserKey is set, so we create
|
|
// an InternalKey which is semantically identical to the key, but won't
|
|
// have a nil UserKey. We do this, because key.UserKey could be nil, and
|
|
// we don't want SmallestPoint.UserKey to be nil.
|
|
//
|
|
// todo(bananabrick): Determine if it's okay to have a nil SmallestPoint
|
|
// .UserKey now that we don't rely on a nil UserKey to determine if the
|
|
// key has been set or not.
|
|
w.meta.SetSmallestPointKey(k.Clone())
|
|
}
|
|
|
|
w.props.NumEntries++
|
|
switch key.Kind() {
|
|
case InternalKeyKindDelete, InternalKeyKindSingleDelete:
|
|
w.props.NumDeletions++
|
|
w.props.RawPointTombstoneKeySize += uint64(len(key.UserKey))
|
|
case InternalKeyKindDeleteSized:
|
|
var size uint64
|
|
if len(value) > 0 {
|
|
var n int
|
|
size, n = binary.Uvarint(value)
|
|
if n <= 0 {
|
|
w.err = errors.Newf("%s key's value (%x) does not parse as uvarint",
|
|
errors.Safe(key.Kind().String()), value)
|
|
return w.err
|
|
}
|
|
}
|
|
w.props.NumDeletions++
|
|
w.props.NumSizedDeletions++
|
|
w.props.RawPointTombstoneKeySize += uint64(len(key.UserKey))
|
|
w.props.RawPointTombstoneValueSize += size
|
|
case InternalKeyKindMerge:
|
|
w.props.NumMergeOperands++
|
|
}
|
|
w.props.RawKeySize += uint64(key.Size())
|
|
w.props.RawValueSize += uint64(len(value))
|
|
return nil
|
|
}
|
|
|
|
func (w *Writer) prettyTombstone(k InternalKey, value []byte) fmt.Formatter {
|
|
return keyspan.Span{
|
|
Start: k.UserKey,
|
|
End: value,
|
|
Keys: []keyspan.Key{{Trailer: k.Trailer}},
|
|
}.Pretty(w.formatKey)
|
|
}
|
|
|
|
func (w *Writer) addTombstone(key InternalKey, value []byte) error {
|
|
if !w.disableKeyOrderChecks && !w.rangeDelV1Format && w.rangeDelBlock.nEntries > 0 {
|
|
// Check that tombstones are being added in fragmented order. If the two
|
|
// tombstones overlap, their start and end keys must be identical.
|
|
prevKey := w.rangeDelBlock.getCurKey()
|
|
switch c := w.compare(prevKey.UserKey, key.UserKey); {
|
|
case c > 0:
|
|
w.err = errors.Errorf("pebble: keys must be added in order: %s, %s",
|
|
prevKey.Pretty(w.formatKey), key.Pretty(w.formatKey))
|
|
return w.err
|
|
case c == 0:
|
|
prevValue := w.rangeDelBlock.curValue
|
|
if w.compare(prevValue, value) != 0 {
|
|
w.err = errors.Errorf("pebble: overlapping tombstones must be fragmented: %s vs %s",
|
|
w.prettyTombstone(prevKey, prevValue),
|
|
w.prettyTombstone(key, value))
|
|
return w.err
|
|
}
|
|
if prevKey.SeqNum() <= key.SeqNum() {
|
|
w.err = errors.Errorf("pebble: keys must be added in strictly increasing order: %s, %s",
|
|
prevKey.Pretty(w.formatKey), key.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
default:
|
|
prevValue := w.rangeDelBlock.curValue
|
|
if w.compare(prevValue, key.UserKey) > 0 {
|
|
w.err = errors.Errorf("pebble: overlapping tombstones must be fragmented: %s vs %s",
|
|
w.prettyTombstone(prevKey, prevValue),
|
|
w.prettyTombstone(key, value))
|
|
return w.err
|
|
}
|
|
}
|
|
}
|
|
|
|
if key.Trailer == InternalKeyRangeDeleteSentinel {
|
|
w.err = errors.Errorf("pebble: cannot add range delete sentinel: %s", key.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
|
|
for i := range w.propCollectors {
|
|
if err := w.propCollectors[i].Add(key, value); err != nil {
|
|
w.err = err
|
|
return err
|
|
}
|
|
}
|
|
|
|
w.meta.updateSeqNum(key.SeqNum())
|
|
|
|
switch {
|
|
case w.rangeDelV1Format:
|
|
// Range tombstones are not fragmented in the v1 (i.e. RocksDB) range
|
|
// deletion block format, so we need to track the largest range tombstone
|
|
// end key as every range tombstone is added.
|
|
//
|
|
// Note that writing the v1 format is only supported for tests.
|
|
if w.props.NumRangeDeletions == 0 {
|
|
w.meta.SetSmallestRangeDelKey(key.Clone())
|
|
w.meta.SetLargestRangeDelKey(base.MakeRangeDeleteSentinelKey(value).Clone())
|
|
} else {
|
|
if base.InternalCompare(w.compare, w.meta.SmallestRangeDel, key) > 0 {
|
|
w.meta.SetSmallestRangeDelKey(key.Clone())
|
|
}
|
|
end := base.MakeRangeDeleteSentinelKey(value)
|
|
if base.InternalCompare(w.compare, w.meta.LargestRangeDel, end) < 0 {
|
|
w.meta.SetLargestRangeDelKey(end.Clone())
|
|
}
|
|
}
|
|
|
|
default:
|
|
// Range tombstones are fragmented in the v2 range deletion block format,
|
|
// so the start key of the first range tombstone added will be the smallest
|
|
// range tombstone key. The largest range tombstone key will be determined
|
|
// in Writer.Close() as the end key of the last range tombstone added.
|
|
if w.props.NumRangeDeletions == 0 {
|
|
w.meta.SetSmallestRangeDelKey(key.Clone())
|
|
}
|
|
}
|
|
|
|
w.props.NumEntries++
|
|
w.props.NumDeletions++
|
|
w.props.NumRangeDeletions++
|
|
w.props.RawKeySize += uint64(key.Size())
|
|
w.props.RawValueSize += uint64(len(value))
|
|
w.rangeDelBlock.add(key, value)
|
|
return nil
|
|
}
|
|
|
|
// RangeKeySet sets a range between start (inclusive) and end (exclusive) with
|
|
// the given suffix to the given value. The resulting range key is given the
|
|
// sequence number zero, with the expectation that the resulting sstable will be
|
|
// ingested.
|
|
//
|
|
// Keys must be added to the table in increasing order of start key. Spans are
|
|
// not required to be fragmented. The same suffix may not be set or unset twice
|
|
// over the same keyspan, because it would result in inconsistent state. Both
|
|
// the Set and Unset would share the zero sequence number, and a key cannot be
|
|
// both simultaneously set and unset.
|
|
func (w *Writer) RangeKeySet(start, end, suffix, value []byte) error {
|
|
return w.addRangeKeySpan(keyspan.Span{
|
|
Start: w.tempRangeKeyCopy(start),
|
|
End: w.tempRangeKeyCopy(end),
|
|
Keys: []keyspan.Key{
|
|
{
|
|
Trailer: base.MakeTrailer(0, base.InternalKeyKindRangeKeySet),
|
|
Suffix: w.tempRangeKeyCopy(suffix),
|
|
Value: w.tempRangeKeyCopy(value),
|
|
},
|
|
},
|
|
})
|
|
}
|
|
|
|
// RangeKeyUnset un-sets a range between start (inclusive) and end (exclusive)
|
|
// with the given suffix. The resulting range key is given the
|
|
// sequence number zero, with the expectation that the resulting sstable will be
|
|
// ingested.
|
|
//
|
|
// Keys must be added to the table in increasing order of start key. Spans are
|
|
// not required to be fragmented. The same suffix may not be set or unset twice
|
|
// over the same keyspan, because it would result in inconsistent state. Both
|
|
// the Set and Unset would share the zero sequence number, and a key cannot be
|
|
// both simultaneously set and unset.
|
|
func (w *Writer) RangeKeyUnset(start, end, suffix []byte) error {
|
|
return w.addRangeKeySpan(keyspan.Span{
|
|
Start: w.tempRangeKeyCopy(start),
|
|
End: w.tempRangeKeyCopy(end),
|
|
Keys: []keyspan.Key{
|
|
{
|
|
Trailer: base.MakeTrailer(0, base.InternalKeyKindRangeKeyUnset),
|
|
Suffix: w.tempRangeKeyCopy(suffix),
|
|
},
|
|
},
|
|
})
|
|
}
|
|
|
|
// RangeKeyDelete deletes a range between start (inclusive) and end (exclusive).
|
|
//
|
|
// Keys must be added to the table in increasing order of start key. Spans are
|
|
// not required to be fragmented.
|
|
func (w *Writer) RangeKeyDelete(start, end []byte) error {
|
|
return w.addRangeKeySpan(keyspan.Span{
|
|
Start: w.tempRangeKeyCopy(start),
|
|
End: w.tempRangeKeyCopy(end),
|
|
Keys: []keyspan.Key{
|
|
{Trailer: base.MakeTrailer(0, base.InternalKeyKindRangeKeyDelete)},
|
|
},
|
|
})
|
|
}
|
|
|
|
// AddRangeKey adds a range key set, unset, or delete key/value pair to the
|
|
// table being written.
|
|
//
|
|
// Range keys must be supplied in strictly ascending order of start key (i.e.
|
|
// user key ascending, sequence number descending, and key type descending).
|
|
// Ranges added must also be supplied in fragmented span order - i.e. other than
|
|
// spans that are perfectly aligned (same start and end keys), spans may not
|
|
// overlap. Range keys may be added out of order relative to point keys and
|
|
// range deletions.
|
|
func (w *Writer) AddRangeKey(key InternalKey, value []byte) error {
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
return w.addRangeKey(key, value)
|
|
}
|
|
|
|
func (w *Writer) addRangeKeySpan(span keyspan.Span) error {
|
|
if w.compare(span.Start, span.End) >= 0 {
|
|
return errors.Errorf(
|
|
"pebble: start key must be strictly less than end key",
|
|
)
|
|
}
|
|
if w.fragmenter.Start() != nil && w.compare(w.fragmenter.Start(), span.Start) > 0 {
|
|
return errors.Errorf("pebble: spans must be added in order: %s > %s",
|
|
w.formatKey(w.fragmenter.Start()), w.formatKey(span.Start))
|
|
}
|
|
// Add this span to the fragmenter.
|
|
w.fragmenter.Add(span)
|
|
return w.err
|
|
}
|
|
|
|
func (w *Writer) encodeRangeKeySpan(span keyspan.Span) {
|
|
// This method is the emit function of the Fragmenter.
|
|
//
|
|
// NB: The span should only contain range keys and be internally consistent
|
|
// (eg, no duplicate suffixes, no additional keys after a RANGEKEYDEL).
|
|
//
|
|
// We use w.rangeKeysBySuffix and w.rangeKeySpan to avoid allocations.
|
|
|
|
// Sort the keys by suffix. Iteration doesn't *currently* depend on it, but
|
|
// we may want to in the future.
|
|
w.rangeKeysBySuffix.Cmp = w.compare
|
|
w.rangeKeysBySuffix.Keys = span.Keys
|
|
sort.Sort(&w.rangeKeysBySuffix)
|
|
|
|
w.rangeKeySpan = span
|
|
w.rangeKeySpan.Keys = w.rangeKeysBySuffix.Keys
|
|
w.err = firstError(w.err, w.rangeKeyEncoder.Encode(&w.rangeKeySpan))
|
|
}
|
|
|
|
func (w *Writer) addRangeKey(key InternalKey, value []byte) error {
|
|
if !w.disableKeyOrderChecks && w.rangeKeyBlock.nEntries > 0 {
|
|
prevStartKey := w.rangeKeyBlock.getCurKey()
|
|
prevEndKey, _, ok := rangekey.DecodeEndKey(prevStartKey.Kind(), w.rangeKeyBlock.curValue)
|
|
if !ok {
|
|
// We panic here as we should have previously decoded and validated this
|
|
// key and value when it was first added to the range key block.
|
|
panic(errors.Errorf("pebble: invalid end key for span: %s",
|
|
prevStartKey.Pretty(w.formatKey)))
|
|
}
|
|
|
|
curStartKey := key
|
|
curEndKey, _, ok := rangekey.DecodeEndKey(curStartKey.Kind(), value)
|
|
if !ok {
|
|
w.err = errors.Errorf("pebble: invalid end key for span: %s",
|
|
curStartKey.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
|
|
// Start keys must be strictly increasing.
|
|
if base.InternalCompare(w.compare, prevStartKey, curStartKey) >= 0 {
|
|
w.err = errors.Errorf(
|
|
"pebble: range keys starts must be added in increasing order: %s, %s",
|
|
prevStartKey.Pretty(w.formatKey), key.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
|
|
// Start keys are increasing. If the start user keys are equal, the
|
|
// end keys must be equal (i.e. aligned spans).
|
|
if w.compare(prevStartKey.UserKey, curStartKey.UserKey) == 0 {
|
|
if w.compare(prevEndKey, curEndKey) != 0 {
|
|
w.err = errors.Errorf("pebble: overlapping range keys must be fragmented: %s, %s",
|
|
prevStartKey.Pretty(w.formatKey),
|
|
curStartKey.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
} else if w.compare(prevEndKey, curStartKey.UserKey) > 0 {
|
|
// If the start user keys are NOT equal, the spans must be disjoint (i.e.
|
|
// no overlap).
|
|
// NOTE: the inequality excludes zero, as we allow the end key of the
|
|
// lower span be the same as the start key of the upper span, because
|
|
// the range end key is considered an exclusive bound.
|
|
w.err = errors.Errorf("pebble: overlapping range keys must be fragmented: %s, %s",
|
|
prevStartKey.Pretty(w.formatKey),
|
|
curStartKey.Pretty(w.formatKey))
|
|
return w.err
|
|
}
|
|
}
|
|
|
|
// TODO(travers): Add an invariant-gated check to ensure that suffix-values
|
|
// are sorted within coalesced spans.
|
|
|
|
// Range-keys and point-keys are intended to live in "parallel" keyspaces.
|
|
// However, we track a single seqnum in the table metadata that spans both of
|
|
// these keyspaces.
|
|
// TODO(travers): Consider tracking range key seqnums separately.
|
|
w.meta.updateSeqNum(key.SeqNum())
|
|
|
|
// Range tombstones are fragmented, so the start key of the first range key
|
|
// added will be the smallest. The largest range key is determined in
|
|
// Writer.Close() as the end key of the last range key added to the block.
|
|
if w.props.NumRangeKeys() == 0 {
|
|
w.meta.SetSmallestRangeKey(key.Clone())
|
|
}
|
|
|
|
// Update block properties.
|
|
w.props.RawRangeKeyKeySize += uint64(key.Size())
|
|
w.props.RawRangeKeyValueSize += uint64(len(value))
|
|
switch key.Kind() {
|
|
case base.InternalKeyKindRangeKeyDelete:
|
|
w.props.NumRangeKeyDels++
|
|
case base.InternalKeyKindRangeKeySet:
|
|
w.props.NumRangeKeySets++
|
|
case base.InternalKeyKindRangeKeyUnset:
|
|
w.props.NumRangeKeyUnsets++
|
|
default:
|
|
panic(errors.Errorf("pebble: invalid range key type: %s", key.Kind()))
|
|
}
|
|
|
|
for i := range w.blockPropCollectors {
|
|
if err := w.blockPropCollectors[i].Add(key, value); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Add the key to the block.
|
|
w.rangeKeyBlock.add(key, value)
|
|
return nil
|
|
}
|
|
|
|
// tempRangeKeyBuf returns a slice of length n from the Writer's rkBuf byte
|
|
// slice. Any byte written to the returned slice is retained for the lifetime of
|
|
// the Writer.
|
|
func (w *Writer) tempRangeKeyBuf(n int) []byte {
|
|
if cap(w.rkBuf)-len(w.rkBuf) < n {
|
|
size := len(w.rkBuf) + 2*n
|
|
if size < 2*cap(w.rkBuf) {
|
|
size = 2 * cap(w.rkBuf)
|
|
}
|
|
buf := make([]byte, len(w.rkBuf), size)
|
|
copy(buf, w.rkBuf)
|
|
w.rkBuf = buf
|
|
}
|
|
b := w.rkBuf[len(w.rkBuf) : len(w.rkBuf)+n]
|
|
w.rkBuf = w.rkBuf[:len(w.rkBuf)+n]
|
|
return b
|
|
}
|
|
|
|
// tempRangeKeyCopy returns a copy of the provided slice, stored in the Writer's
|
|
// range key buffer.
|
|
func (w *Writer) tempRangeKeyCopy(k []byte) []byte {
|
|
if len(k) == 0 {
|
|
return nil
|
|
}
|
|
buf := w.tempRangeKeyBuf(len(k))
|
|
copy(buf, k)
|
|
return buf
|
|
}
|
|
|
|
func (w *Writer) maybeAddToFilter(key []byte) {
|
|
if w.filter != nil {
|
|
if w.split != nil {
|
|
prefix := key[:w.split(key)]
|
|
w.filter.addKey(prefix)
|
|
} else {
|
|
w.filter.addKey(key)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (w *Writer) flush(key InternalKey) error {
|
|
// We're finishing a data block.
|
|
err := w.finishDataBlockProps(w.dataBlockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
w.dataBlockBuf.finish()
|
|
w.dataBlockBuf.compressAndChecksum(w.compression)
|
|
// Since dataBlockEstimates.addInflightDataBlock was never called, the
|
|
// inflightSize is set to 0.
|
|
w.coordination.sizeEstimate.dataBlockCompressed(len(w.dataBlockBuf.compressed), 0)
|
|
|
|
// Determine if the index block should be flushed. Since we're accessing the
|
|
// dataBlockBuf.dataBlock.curKey here, we have to make sure that once we start
|
|
// to pool the dataBlockBufs, the curKey isn't used by the Writer once the
|
|
// dataBlockBuf is added back to a sync.Pool. In this particular case, the
|
|
// byte slice which supports "sep" will eventually be copied when "sep" is
|
|
// added to the index block.
|
|
prevKey := w.dataBlockBuf.dataBlock.getCurKey()
|
|
sep := w.indexEntrySep(prevKey, key, w.dataBlockBuf)
|
|
// We determine that we should flush an index block from the Writer client
|
|
// goroutine, but we actually finish the index block from the writeQueue.
|
|
// When we determine that an index block should be flushed, we need to call
|
|
// BlockPropertyCollector.FinishIndexBlock. But block property collector
|
|
// calls must happen sequentially from the Writer client. Therefore, we need
|
|
// to determine that we are going to flush the index block from the Writer
|
|
// client.
|
|
shouldFlushIndexBlock := supportsTwoLevelIndex(w.tableFormat) && w.indexBlock.shouldFlush(
|
|
sep, encodedBHPEstimatedSize, w.indexBlockSize, w.indexBlockSizeThreshold,
|
|
)
|
|
|
|
var indexProps []byte
|
|
var flushableIndexBlock *indexBlockBuf
|
|
if shouldFlushIndexBlock {
|
|
flushableIndexBlock = w.indexBlock
|
|
w.indexBlock = newIndexBlockBuf(w.coordination.parallelismEnabled)
|
|
// Call BlockPropertyCollector.FinishIndexBlock, since we've decided to
|
|
// flush the index block.
|
|
indexProps, err = w.finishIndexBlockProps()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// We've called BlockPropertyCollector.FinishDataBlock, and, if necessary,
|
|
// BlockPropertyCollector.FinishIndexBlock. Since we've decided to finish
|
|
// the data block, we can call
|
|
// BlockPropertyCollector.AddPrevDataBlockToIndexBlock.
|
|
w.addPrevDataBlockToIndexBlockProps()
|
|
|
|
// Schedule a write.
|
|
writeTask := writeTaskPool.Get().(*writeTask)
|
|
// We're setting compressionDone to indicate that compression of this block
|
|
// has already been completed.
|
|
writeTask.compressionDone <- true
|
|
writeTask.buf = w.dataBlockBuf
|
|
writeTask.indexEntrySep = sep
|
|
writeTask.currIndexBlock = w.indexBlock
|
|
writeTask.indexInflightSize = sep.Size() + encodedBHPEstimatedSize
|
|
writeTask.finishedIndexProps = indexProps
|
|
writeTask.flushableIndexBlock = flushableIndexBlock
|
|
|
|
// The writeTask corresponds to an unwritten index entry.
|
|
w.indexBlock.addInflight(writeTask.indexInflightSize)
|
|
|
|
w.dataBlockBuf = nil
|
|
if w.coordination.parallelismEnabled {
|
|
w.coordination.writeQueue.add(writeTask)
|
|
} else {
|
|
err = w.coordination.writeQueue.addSync(writeTask)
|
|
}
|
|
w.dataBlockBuf = newDataBlockBuf(w.restartInterval, w.checksumType)
|
|
|
|
return err
|
|
}
|
|
|
|
func (w *Writer) maybeFlush(key InternalKey, valueLen int) error {
|
|
if !w.dataBlockBuf.shouldFlush(key, valueLen, w.blockSize, w.blockSizeThreshold) {
|
|
return nil
|
|
}
|
|
|
|
err := w.flush(key)
|
|
|
|
if err != nil {
|
|
w.err = err
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// dataBlockBuf.dataBlockProps set by this method must be encoded before any future use of the
|
|
// dataBlockBuf.blockPropsEncoder, since the properties slice will get reused by the
|
|
// blockPropsEncoder.
|
|
func (w *Writer) finishDataBlockProps(buf *dataBlockBuf) error {
|
|
if len(w.blockPropCollectors) == 0 {
|
|
return nil
|
|
}
|
|
var err error
|
|
buf.blockPropsEncoder.resetProps()
|
|
for i := range w.blockPropCollectors {
|
|
scratch := buf.blockPropsEncoder.getScratchForProp()
|
|
if scratch, err = w.blockPropCollectors[i].FinishDataBlock(scratch); err != nil {
|
|
return err
|
|
}
|
|
if len(scratch) > 0 {
|
|
buf.blockPropsEncoder.addProp(shortID(i), scratch)
|
|
}
|
|
}
|
|
|
|
buf.dataBlockProps = buf.blockPropsEncoder.unsafeProps()
|
|
return nil
|
|
}
|
|
|
|
// The BlockHandleWithProperties returned by this method must be encoded before any future use of
|
|
// the Writer.blockPropsEncoder, since the properties slice will get reused by the blockPropsEncoder.
|
|
// maybeAddBlockPropertiesToBlockHandle should only be called if block is being written synchronously
|
|
// with the Writer client.
|
|
func (w *Writer) maybeAddBlockPropertiesToBlockHandle(
|
|
bh BlockHandle,
|
|
) (BlockHandleWithProperties, error) {
|
|
err := w.finishDataBlockProps(w.dataBlockBuf)
|
|
if err != nil {
|
|
return BlockHandleWithProperties{}, err
|
|
}
|
|
return BlockHandleWithProperties{BlockHandle: bh, Props: w.dataBlockBuf.dataBlockProps}, nil
|
|
}
|
|
|
|
func (w *Writer) indexEntrySep(prevKey, key InternalKey, dataBlockBuf *dataBlockBuf) InternalKey {
|
|
// Make a rough guess that we want key-sized scratch to compute the separator.
|
|
if cap(dataBlockBuf.sepScratch) < key.Size() {
|
|
dataBlockBuf.sepScratch = make([]byte, 0, key.Size()*2)
|
|
}
|
|
|
|
var sep InternalKey
|
|
if key.UserKey == nil && key.Trailer == 0 {
|
|
sep = prevKey.Successor(w.compare, w.successor, dataBlockBuf.sepScratch[:0])
|
|
} else {
|
|
sep = prevKey.Separator(w.compare, w.separator, dataBlockBuf.sepScratch[:0], key)
|
|
}
|
|
return sep
|
|
}
|
|
|
|
// addIndexEntry adds an index entry for the specified key and block handle.
|
|
// addIndexEntry can be called from both the Writer client goroutine, and the
|
|
// writeQueue goroutine. If the flushIndexBuf != nil, then the indexProps, as
|
|
// they're used when the index block is finished.
|
|
//
|
|
// Invariant:
|
|
// 1. addIndexEntry must not store references to the sep InternalKey, the tmp
|
|
// byte slice, bhp.Props. That is, these must be either deep copied or
|
|
// encoded.
|
|
// 2. addIndexEntry must not hold references to the flushIndexBuf, and the writeTo
|
|
// indexBlockBufs.
|
|
func (w *Writer) addIndexEntry(
|
|
sep InternalKey,
|
|
bhp BlockHandleWithProperties,
|
|
tmp []byte,
|
|
flushIndexBuf *indexBlockBuf,
|
|
writeTo *indexBlockBuf,
|
|
inflightSize int,
|
|
indexProps []byte,
|
|
) error {
|
|
if bhp.Length == 0 {
|
|
// A valid blockHandle must be non-zero.
|
|
// In particular, it must have a non-zero length.
|
|
return nil
|
|
}
|
|
|
|
encoded := encodeBlockHandleWithProperties(tmp, bhp)
|
|
|
|
if flushIndexBuf != nil {
|
|
if cap(w.indexPartitions) == 0 {
|
|
w.indexPartitions = make([]indexBlockAndBlockProperties, 0, 32)
|
|
}
|
|
// Enable two level indexes if there is more than one index block.
|
|
w.twoLevelIndex = true
|
|
if err := w.finishIndexBlock(flushIndexBuf, indexProps); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
writeTo.add(sep, encoded, inflightSize)
|
|
return nil
|
|
}
|
|
|
|
func (w *Writer) addPrevDataBlockToIndexBlockProps() {
|
|
for i := range w.blockPropCollectors {
|
|
w.blockPropCollectors[i].AddPrevDataBlockToIndexBlock()
|
|
}
|
|
}
|
|
|
|
// addIndexEntrySync adds an index entry for the specified key and block handle.
|
|
// Writer.addIndexEntry is only called synchronously once Writer.Close is called.
|
|
// addIndexEntrySync should only be called if we're sure that index entries
|
|
// aren't being written asynchronously.
|
|
//
|
|
// Invariant:
|
|
// 1. addIndexEntrySync must not store references to the prevKey, key InternalKey's,
|
|
// the tmp byte slice. That is, these must be either deep copied or encoded.
|
|
func (w *Writer) addIndexEntrySync(
|
|
prevKey, key InternalKey, bhp BlockHandleWithProperties, tmp []byte,
|
|
) error {
|
|
sep := w.indexEntrySep(prevKey, key, w.dataBlockBuf)
|
|
shouldFlush := supportsTwoLevelIndex(
|
|
w.tableFormat) && w.indexBlock.shouldFlush(
|
|
sep, encodedBHPEstimatedSize, w.indexBlockSize, w.indexBlockSizeThreshold,
|
|
)
|
|
var flushableIndexBlock *indexBlockBuf
|
|
var props []byte
|
|
var err error
|
|
if shouldFlush {
|
|
flushableIndexBlock = w.indexBlock
|
|
w.indexBlock = newIndexBlockBuf(w.coordination.parallelismEnabled)
|
|
|
|
// Call BlockPropertyCollector.FinishIndexBlock, since we've decided to
|
|
// flush the index block.
|
|
props, err = w.finishIndexBlockProps()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
err = w.addIndexEntry(sep, bhp, tmp, flushableIndexBlock, w.indexBlock, 0, props)
|
|
if flushableIndexBlock != nil {
|
|
flushableIndexBlock.clear()
|
|
indexBlockBufPool.Put(flushableIndexBlock)
|
|
}
|
|
w.addPrevDataBlockToIndexBlockProps()
|
|
return err
|
|
}
|
|
|
|
func shouldFlush(
|
|
key InternalKey,
|
|
valueLen int,
|
|
restartInterval, estimatedBlockSize, numEntries, targetBlockSize, sizeThreshold int,
|
|
) bool {
|
|
if numEntries == 0 {
|
|
return false
|
|
}
|
|
|
|
if estimatedBlockSize >= targetBlockSize {
|
|
return true
|
|
}
|
|
|
|
// The block is currently smaller than the target size.
|
|
if estimatedBlockSize <= sizeThreshold {
|
|
// The block is smaller than the threshold size at which we'll consider
|
|
// flushing it.
|
|
return false
|
|
}
|
|
|
|
newSize := estimatedBlockSize + key.Size() + valueLen
|
|
if numEntries%restartInterval == 0 {
|
|
newSize += 4
|
|
}
|
|
newSize += 4 // varint for shared prefix length
|
|
newSize += uvarintLen(uint32(key.Size())) // varint for unshared key bytes
|
|
newSize += uvarintLen(uint32(valueLen)) // varint for value size
|
|
// Flush if the block plus the new entry is larger than the target size.
|
|
return newSize > targetBlockSize
|
|
}
|
|
|
|
func cloneKeyWithBuf(k InternalKey, a bytealloc.A) (bytealloc.A, InternalKey) {
|
|
if len(k.UserKey) == 0 {
|
|
return a, k
|
|
}
|
|
a, keyCopy := a.Copy(k.UserKey)
|
|
return a, InternalKey{UserKey: keyCopy, Trailer: k.Trailer}
|
|
}
|
|
|
|
// Invariants: The byte slice returned by finishIndexBlockProps is heap-allocated
|
|
//
|
|
// and has its own lifetime, independent of the Writer and the blockPropsEncoder,
|
|
//
|
|
// and it is safe to:
|
|
// 1. Reuse w.blockPropsEncoder without first encoding the byte slice returned.
|
|
// 2. Store the byte slice in the Writer since it is a copy and not supported by
|
|
// an underlying buffer.
|
|
func (w *Writer) finishIndexBlockProps() ([]byte, error) {
|
|
w.blockPropsEncoder.resetProps()
|
|
for i := range w.blockPropCollectors {
|
|
scratch := w.blockPropsEncoder.getScratchForProp()
|
|
var err error
|
|
if scratch, err = w.blockPropCollectors[i].FinishIndexBlock(scratch); err != nil {
|
|
return nil, err
|
|
}
|
|
if len(scratch) > 0 {
|
|
w.blockPropsEncoder.addProp(shortID(i), scratch)
|
|
}
|
|
}
|
|
return w.blockPropsEncoder.props(), nil
|
|
}
|
|
|
|
// finishIndexBlock finishes the current index block and adds it to the top
|
|
// level index block. This is only used when two level indexes are enabled.
|
|
//
|
|
// Invariants:
|
|
// 1. The props slice passed into finishedIndexBlock must not be a
|
|
// owned by any other struct, since it will be stored in the Writer.indexPartitions
|
|
// slice.
|
|
// 2. None of the buffers owned by indexBuf will be shallow copied and stored elsewhere.
|
|
// That is, it must be safe to reuse indexBuf after finishIndexBlock has been called.
|
|
func (w *Writer) finishIndexBlock(indexBuf *indexBlockBuf, props []byte) error {
|
|
part := indexBlockAndBlockProperties{
|
|
nEntries: indexBuf.block.nEntries, properties: props,
|
|
}
|
|
w.indexSepAlloc, part.sep = cloneKeyWithBuf(
|
|
indexBuf.block.getCurKey(), w.indexSepAlloc,
|
|
)
|
|
bk := indexBuf.finish()
|
|
if len(w.indexBlockAlloc) < len(bk) {
|
|
// Allocate enough bytes for approximately 16 index blocks.
|
|
w.indexBlockAlloc = make([]byte, len(bk)*16)
|
|
}
|
|
n := copy(w.indexBlockAlloc, bk)
|
|
part.block = w.indexBlockAlloc[:n:n]
|
|
w.indexBlockAlloc = w.indexBlockAlloc[n:]
|
|
w.indexPartitions = append(w.indexPartitions, part)
|
|
return nil
|
|
}
|
|
|
|
func (w *Writer) writeTwoLevelIndex() (BlockHandle, error) {
|
|
props, err := w.finishIndexBlockProps()
|
|
if err != nil {
|
|
return BlockHandle{}, err
|
|
}
|
|
// Add the final unfinished index.
|
|
if err = w.finishIndexBlock(w.indexBlock, props); err != nil {
|
|
return BlockHandle{}, err
|
|
}
|
|
|
|
for i := range w.indexPartitions {
|
|
b := &w.indexPartitions[i]
|
|
w.props.NumDataBlocks += uint64(b.nEntries)
|
|
|
|
data := b.block
|
|
w.props.IndexSize += uint64(len(data))
|
|
bh, err := w.writeBlock(data, w.compression, &w.blockBuf)
|
|
if err != nil {
|
|
return BlockHandle{}, err
|
|
}
|
|
bhp := BlockHandleWithProperties{
|
|
BlockHandle: bh,
|
|
Props: b.properties,
|
|
}
|
|
encoded := encodeBlockHandleWithProperties(w.blockBuf.tmp[:], bhp)
|
|
w.topLevelIndexBlock.add(b.sep, encoded)
|
|
}
|
|
|
|
// NB: RocksDB includes the block trailer length in the index size
|
|
// property, though it doesn't include the trailer in the top level
|
|
// index size property.
|
|
w.props.IndexPartitions = uint64(len(w.indexPartitions))
|
|
w.props.TopLevelIndexSize = uint64(w.topLevelIndexBlock.estimatedSize())
|
|
w.props.IndexSize += w.props.TopLevelIndexSize + blockTrailerLen
|
|
|
|
return w.writeBlock(w.topLevelIndexBlock.finish(), w.compression, &w.blockBuf)
|
|
}
|
|
|
|
func compressAndChecksum(b []byte, compression Compression, blockBuf *blockBuf) []byte {
|
|
// Compress the buffer, discarding the result if the improvement isn't at
|
|
// least 12.5%.
|
|
blockType, compressed := compressBlock(compression, b, blockBuf.compressedBuf)
|
|
if blockType != noCompressionBlockType && cap(compressed) > cap(blockBuf.compressedBuf) {
|
|
blockBuf.compressedBuf = compressed[:cap(compressed)]
|
|
}
|
|
if len(compressed) < len(b)-len(b)/8 {
|
|
b = compressed
|
|
} else {
|
|
blockType = noCompressionBlockType
|
|
}
|
|
|
|
blockBuf.tmp[0] = byte(blockType)
|
|
|
|
// Calculate the checksum.
|
|
checksum := blockBuf.checksummer.checksum(b, blockBuf.tmp[:1])
|
|
binary.LittleEndian.PutUint32(blockBuf.tmp[1:5], checksum)
|
|
return b
|
|
}
|
|
|
|
func (w *Writer) writeCompressedBlock(block []byte, blockTrailerBuf []byte) (BlockHandle, error) {
|
|
bh := BlockHandle{Offset: w.meta.Size, Length: uint64(len(block))}
|
|
|
|
if w.cacheID != 0 && w.fileNum.FileNum() != 0 {
|
|
// Remove the block being written from the cache. This provides defense in
|
|
// depth against bugs which cause cache collisions.
|
|
//
|
|
// TODO(peter): Alternatively, we could add the uncompressed value to the
|
|
// cache.
|
|
w.cache.Delete(w.cacheID, w.fileNum, bh.Offset)
|
|
}
|
|
|
|
// Write the bytes to the file.
|
|
if err := w.writable.Write(block); err != nil {
|
|
return BlockHandle{}, err
|
|
}
|
|
w.meta.Size += uint64(len(block))
|
|
if err := w.writable.Write(blockTrailerBuf[:blockTrailerLen]); err != nil {
|
|
return BlockHandle{}, err
|
|
}
|
|
w.meta.Size += blockTrailerLen
|
|
|
|
return bh, nil
|
|
}
|
|
|
|
// Write implements io.Writer. This is analogous to writeCompressedBlock for
|
|
// blocks that already incorporate the trailer, and don't need the callee to
|
|
// return a BlockHandle.
|
|
func (w *Writer) Write(blockWithTrailer []byte) (n int, err error) {
|
|
offset := w.meta.Size
|
|
if w.cacheID != 0 && w.fileNum.FileNum() != 0 {
|
|
// Remove the block being written from the cache. This provides defense in
|
|
// depth against bugs which cause cache collisions.
|
|
//
|
|
// TODO(peter): Alternatively, we could add the uncompressed value to the
|
|
// cache.
|
|
w.cache.Delete(w.cacheID, w.fileNum, offset)
|
|
}
|
|
w.meta.Size += uint64(len(blockWithTrailer))
|
|
if err := w.writable.Write(blockWithTrailer); err != nil {
|
|
return 0, err
|
|
}
|
|
return len(blockWithTrailer), nil
|
|
}
|
|
|
|
func (w *Writer) writeBlock(
|
|
b []byte, compression Compression, blockBuf *blockBuf,
|
|
) (BlockHandle, error) {
|
|
b = compressAndChecksum(b, compression, blockBuf)
|
|
return w.writeCompressedBlock(b, blockBuf.tmp[:])
|
|
}
|
|
|
|
// assertFormatCompatibility ensures that the features present on the table are
|
|
// compatible with the table format version.
|
|
func (w *Writer) assertFormatCompatibility() error {
|
|
// PebbleDBv1: block properties.
|
|
if len(w.blockPropCollectors) > 0 && w.tableFormat < TableFormatPebblev1 {
|
|
return errors.Newf(
|
|
"table format version %s is less than the minimum required version %s for block properties",
|
|
w.tableFormat, TableFormatPebblev1,
|
|
)
|
|
}
|
|
|
|
// PebbleDBv2: range keys.
|
|
if w.props.NumRangeKeys() > 0 && w.tableFormat < TableFormatPebblev2 {
|
|
return errors.Newf(
|
|
"table format version %s is less than the minimum required version %s for range keys",
|
|
w.tableFormat, TableFormatPebblev2,
|
|
)
|
|
}
|
|
|
|
// PebbleDBv3: value blocks.
|
|
if (w.props.NumValueBlocks > 0 || w.props.NumValuesInValueBlocks > 0 ||
|
|
w.props.ValueBlocksSize > 0) && w.tableFormat < TableFormatPebblev3 {
|
|
return errors.Newf(
|
|
"table format version %s is less than the minimum required version %s for value blocks",
|
|
w.tableFormat, TableFormatPebblev3)
|
|
}
|
|
|
|
// PebbleDBv4: DELSIZED tombstones.
|
|
if w.props.NumSizedDeletions > 0 && w.tableFormat < TableFormatPebblev4 {
|
|
return errors.Newf(
|
|
"table format version %s is less than the minimum required version %s for sized deletion tombstones",
|
|
w.tableFormat, TableFormatPebblev4)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Close finishes writing the table and closes the underlying file that the
|
|
// table was written to.
|
|
func (w *Writer) Close() (err error) {
|
|
defer func() {
|
|
if w.valueBlockWriter != nil {
|
|
releaseValueBlockWriter(w.valueBlockWriter)
|
|
// Defensive code in case Close gets called again. We don't want to put
|
|
// the same object to a sync.Pool.
|
|
w.valueBlockWriter = nil
|
|
}
|
|
if w.writable != nil {
|
|
w.writable.Abort()
|
|
w.writable = nil
|
|
}
|
|
// Record any error in the writer (so we can exit early if Close is called
|
|
// again).
|
|
if err != nil {
|
|
w.err = err
|
|
}
|
|
}()
|
|
|
|
// finish must be called before we check for an error, because finish will
|
|
// block until every single task added to the writeQueue has been processed,
|
|
// and an error could be encountered while any of those tasks are processed.
|
|
if err := w.coordination.writeQueue.finish(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if w.err != nil {
|
|
return w.err
|
|
}
|
|
|
|
// The w.meta.LargestPointKey is only used once the Writer is closed, so it is safe to set it
|
|
// when the Writer is closed.
|
|
//
|
|
// The following invariants ensure that setting the largest key at this point of a Writer close
|
|
// is correct:
|
|
// 1. Keys must only be added to the Writer in an increasing order.
|
|
// 2. The current w.dataBlockBuf is guaranteed to have the latest key added to the Writer. This
|
|
// must be true, because a w.dataBlockBuf is only switched out when a dataBlock is flushed,
|
|
// however, if a dataBlock is flushed, then we add a key to the new w.dataBlockBuf in the
|
|
// addPoint function after the flush occurs.
|
|
if w.dataBlockBuf.dataBlock.nEntries >= 1 {
|
|
w.meta.SetLargestPointKey(w.dataBlockBuf.dataBlock.getCurKey().Clone())
|
|
}
|
|
|
|
// Finish the last data block, or force an empty data block if there
|
|
// aren't any data blocks at all.
|
|
if w.dataBlockBuf.dataBlock.nEntries > 0 || w.indexBlock.block.nEntries == 0 {
|
|
bh, err := w.writeBlock(w.dataBlockBuf.dataBlock.finish(), w.compression, &w.dataBlockBuf.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bhp, err := w.maybeAddBlockPropertiesToBlockHandle(bh)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
prevKey := w.dataBlockBuf.dataBlock.getCurKey()
|
|
if err := w.addIndexEntrySync(prevKey, InternalKey{}, bhp, w.dataBlockBuf.tmp[:]); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
w.props.DataSize = w.meta.Size
|
|
|
|
// Write the filter block.
|
|
var metaindex rawBlockWriter
|
|
metaindex.restartInterval = 1
|
|
if w.filter != nil {
|
|
b, err := w.filter.finish()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bh, err := w.writeBlock(b, NoCompression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
n := encodeBlockHandle(w.blockBuf.tmp[:], bh)
|
|
metaindex.add(InternalKey{UserKey: []byte(w.filter.metaName())}, w.blockBuf.tmp[:n])
|
|
w.props.FilterPolicyName = w.filter.policyName()
|
|
w.props.FilterSize = bh.Length
|
|
}
|
|
|
|
var indexBH BlockHandle
|
|
if w.twoLevelIndex {
|
|
w.props.IndexType = twoLevelIndex
|
|
// Write the two level index block.
|
|
indexBH, err = w.writeTwoLevelIndex()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
w.props.IndexType = binarySearchIndex
|
|
// NB: RocksDB includes the block trailer length in the index size
|
|
// property, though it doesn't include the trailer in the filter size
|
|
// property.
|
|
w.props.IndexSize = uint64(w.indexBlock.estimatedSize()) + blockTrailerLen
|
|
w.props.NumDataBlocks = uint64(w.indexBlock.block.nEntries)
|
|
|
|
// Write the single level index block.
|
|
indexBH, err = w.writeBlock(w.indexBlock.finish(), w.compression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Write the range-del block. The block handle must added to the meta index block
|
|
// after the properties block has been written. This is because the entries in the
|
|
// metaindex block must be sorted by key.
|
|
var rangeDelBH BlockHandle
|
|
if w.props.NumRangeDeletions > 0 {
|
|
if !w.rangeDelV1Format {
|
|
// Because the range tombstones are fragmented in the v2 format, the end
|
|
// key of the last added range tombstone will be the largest range
|
|
// tombstone key. Note that we need to make this into a range deletion
|
|
// sentinel because sstable boundaries are inclusive while the end key of
|
|
// a range deletion tombstone is exclusive. A Clone() is necessary as
|
|
// rangeDelBlock.curValue is the same slice that will get passed
|
|
// into w.writer, and some implementations of vfs.File mutate the
|
|
// slice passed into Write(). Also, w.meta will often outlive the
|
|
// blockWriter, and so cloning curValue allows the rangeDelBlock's
|
|
// internal buffer to get gc'd.
|
|
k := base.MakeRangeDeleteSentinelKey(w.rangeDelBlock.curValue).Clone()
|
|
w.meta.SetLargestRangeDelKey(k)
|
|
}
|
|
rangeDelBH, err = w.writeBlock(w.rangeDelBlock.finish(), NoCompression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Write the range-key block, flushing any remaining spans from the
|
|
// fragmenter first.
|
|
w.fragmenter.Finish()
|
|
|
|
var rangeKeyBH BlockHandle
|
|
if w.props.NumRangeKeys() > 0 {
|
|
key := w.rangeKeyBlock.getCurKey()
|
|
kind := key.Kind()
|
|
endKey, _, ok := rangekey.DecodeEndKey(kind, w.rangeKeyBlock.curValue)
|
|
if !ok {
|
|
return errors.Newf("invalid end key: %s", w.rangeKeyBlock.curValue)
|
|
}
|
|
k := base.MakeExclusiveSentinelKey(kind, endKey).Clone()
|
|
w.meta.SetLargestRangeKey(k)
|
|
// TODO(travers): The lack of compression on the range key block matches the
|
|
// lack of compression on the range-del block. Revisit whether we want to
|
|
// enable compression on this block.
|
|
rangeKeyBH, err = w.writeBlock(w.rangeKeyBlock.finish(), NoCompression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if w.valueBlockWriter != nil {
|
|
vbiHandle, vbStats, err := w.valueBlockWriter.finish(w, w.meta.Size)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
w.props.NumValueBlocks = vbStats.numValueBlocks
|
|
w.props.NumValuesInValueBlocks = vbStats.numValuesInValueBlocks
|
|
w.props.ValueBlocksSize = vbStats.valueBlocksAndIndexSize
|
|
if vbStats.numValueBlocks > 0 {
|
|
n := encodeValueBlocksIndexHandle(w.blockBuf.tmp[:], vbiHandle)
|
|
metaindex.add(InternalKey{UserKey: []byte(metaValueIndexName)}, w.blockBuf.tmp[:n])
|
|
}
|
|
}
|
|
|
|
// Add the range key block handle to the metaindex block. Note that we add the
|
|
// block handle to the metaindex block before the other meta blocks as the
|
|
// metaindex block entries must be sorted, and the range key block name sorts
|
|
// before the other block names.
|
|
if w.props.NumRangeKeys() > 0 {
|
|
n := encodeBlockHandle(w.blockBuf.tmp[:], rangeKeyBH)
|
|
metaindex.add(InternalKey{UserKey: []byte(metaRangeKeyName)}, w.blockBuf.tmp[:n])
|
|
}
|
|
|
|
{
|
|
userProps := make(map[string]string)
|
|
for i := range w.propCollectors {
|
|
if err := w.propCollectors[i].Finish(userProps); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
for i := range w.blockPropCollectors {
|
|
scratch := w.blockPropsEncoder.getScratchForProp()
|
|
// Place the shortID in the first byte.
|
|
scratch = append(scratch, byte(i))
|
|
buf, err := w.blockPropCollectors[i].FinishTable(scratch)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var prop string
|
|
if len(buf) > 0 {
|
|
prop = string(buf)
|
|
}
|
|
// NB: The property is populated in the map even if it is the
|
|
// empty string, since the presence in the map is what indicates
|
|
// that the block property collector was used when writing.
|
|
userProps[w.blockPropCollectors[i].Name()] = prop
|
|
}
|
|
if len(userProps) > 0 {
|
|
w.props.UserProperties = userProps
|
|
}
|
|
|
|
// Write the properties block.
|
|
var raw rawBlockWriter
|
|
// The restart interval is set to infinity because the properties block
|
|
// is always read sequentially and cached in a heap located object. This
|
|
// reduces table size without a significant impact on performance.
|
|
raw.restartInterval = propertiesBlockRestartInterval
|
|
w.props.CompressionOptions = rocksDBCompressionOptions
|
|
w.props.save(w.tableFormat, &raw)
|
|
bh, err := w.writeBlock(raw.finish(), NoCompression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
n := encodeBlockHandle(w.blockBuf.tmp[:], bh)
|
|
metaindex.add(InternalKey{UserKey: []byte(metaPropertiesName)}, w.blockBuf.tmp[:n])
|
|
}
|
|
|
|
// Add the range deletion block handle to the metaindex block.
|
|
if w.props.NumRangeDeletions > 0 {
|
|
n := encodeBlockHandle(w.blockBuf.tmp[:], rangeDelBH)
|
|
// The v2 range-del block encoding is backwards compatible with the v1
|
|
// encoding. We add meta-index entries for both the old name and the new
|
|
// name so that old code can continue to find the range-del block and new
|
|
// code knows that the range tombstones in the block are fragmented and
|
|
// sorted.
|
|
metaindex.add(InternalKey{UserKey: []byte(metaRangeDelName)}, w.blockBuf.tmp[:n])
|
|
if !w.rangeDelV1Format {
|
|
metaindex.add(InternalKey{UserKey: []byte(metaRangeDelV2Name)}, w.blockBuf.tmp[:n])
|
|
}
|
|
}
|
|
|
|
// Write the metaindex block. It might be an empty block, if the filter
|
|
// policy is nil. NoCompression is specified because a) RocksDB never
|
|
// compresses the meta-index block and b) RocksDB has some code paths which
|
|
// expect the meta-index block to not be compressed.
|
|
metaindexBH, err := w.writeBlock(metaindex.blockWriter.finish(), NoCompression, &w.blockBuf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Write the table footer.
|
|
footer := footer{
|
|
format: w.tableFormat,
|
|
checksum: w.blockBuf.checksummer.checksumType,
|
|
metaindexBH: metaindexBH,
|
|
indexBH: indexBH,
|
|
}
|
|
encoded := footer.encode(w.blockBuf.tmp[:])
|
|
if err := w.writable.Write(footer.encode(w.blockBuf.tmp[:])); err != nil {
|
|
return err
|
|
}
|
|
w.meta.Size += uint64(len(encoded))
|
|
w.meta.Properties = w.props
|
|
|
|
// Check that the features present in the table are compatible with the format
|
|
// configured for the table.
|
|
if err = w.assertFormatCompatibility(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := w.writable.Finish(); err != nil {
|
|
w.writable = nil
|
|
return err
|
|
}
|
|
w.writable = nil
|
|
|
|
w.dataBlockBuf.clear()
|
|
dataBlockBufPool.Put(w.dataBlockBuf)
|
|
w.dataBlockBuf = nil
|
|
w.indexBlock.clear()
|
|
indexBlockBufPool.Put(w.indexBlock)
|
|
w.indexBlock = nil
|
|
|
|
// Make any future calls to Set or Close return an error.
|
|
w.err = errWriterClosed
|
|
return nil
|
|
}
|
|
|
|
// EstimatedSize returns the estimated size of the sstable being written if a
|
|
// call to Finish() was made without adding additional keys.
|
|
func (w *Writer) EstimatedSize() uint64 {
|
|
return w.coordination.sizeEstimate.size() +
|
|
uint64(w.dataBlockBuf.dataBlock.estimatedSize()) +
|
|
w.indexBlock.estimatedSize()
|
|
}
|
|
|
|
// Metadata returns the metadata for the finished sstable. Only valid to call
|
|
// after the sstable has been finished.
|
|
func (w *Writer) Metadata() (*WriterMetadata, error) {
|
|
if w.writable != nil {
|
|
return nil, errors.New("pebble: writer is not closed")
|
|
}
|
|
return &w.meta, nil
|
|
}
|
|
|
|
// WriterOption provide an interface to do work on Writer while it is being
|
|
// opened.
|
|
type WriterOption interface {
|
|
// writerApply is called on the writer during opening in order to set
|
|
// internal parameters.
|
|
writerApply(*Writer)
|
|
}
|
|
|
|
// PreviousPointKeyOpt is a WriterOption that provides access to the last
|
|
// point key written to the writer while building a sstable.
|
|
type PreviousPointKeyOpt struct {
|
|
w *Writer
|
|
}
|
|
|
|
// UnsafeKey returns the last point key written to the writer to which this
|
|
// option was passed during creation. The returned key points directly into
|
|
// a buffer belonging to the Writer. The value's lifetime ends the next time a
|
|
// point key is added to the Writer.
|
|
// Invariant: UnsafeKey isn't and shouldn't be called after the Writer is closed.
|
|
func (o PreviousPointKeyOpt) UnsafeKey() base.InternalKey {
|
|
if o.w == nil {
|
|
return base.InvalidInternalKey
|
|
}
|
|
|
|
if o.w.dataBlockBuf.dataBlock.nEntries >= 1 {
|
|
// o.w.dataBlockBuf.dataBlock.curKey is guaranteed to point to the last point key
|
|
// which was added to the Writer.
|
|
return o.w.dataBlockBuf.dataBlock.getCurKey()
|
|
}
|
|
return base.InternalKey{}
|
|
}
|
|
|
|
func (o *PreviousPointKeyOpt) writerApply(w *Writer) {
|
|
o.w = w
|
|
}
|
|
|
|
// NewWriter returns a new table writer for the file. Closing the writer will
|
|
// close the file.
|
|
func NewWriter(writable objstorage.Writable, o WriterOptions, extraOpts ...WriterOption) *Writer {
|
|
o = o.ensureDefaults()
|
|
w := &Writer{
|
|
writable: writable,
|
|
meta: WriterMetadata{
|
|
SmallestSeqNum: math.MaxUint64,
|
|
},
|
|
blockSize: o.BlockSize,
|
|
blockSizeThreshold: (o.BlockSize*o.BlockSizeThreshold + 99) / 100,
|
|
indexBlockSize: o.IndexBlockSize,
|
|
indexBlockSizeThreshold: (o.IndexBlockSize*o.BlockSizeThreshold + 99) / 100,
|
|
compare: o.Comparer.Compare,
|
|
split: o.Comparer.Split,
|
|
formatKey: o.Comparer.FormatKey,
|
|
compression: o.Compression,
|
|
separator: o.Comparer.Separator,
|
|
successor: o.Comparer.Successor,
|
|
tableFormat: o.TableFormat,
|
|
isStrictObsolete: o.IsStrictObsolete,
|
|
writingToLowestLevel: o.WritingToLowestLevel,
|
|
cache: o.Cache,
|
|
restartInterval: o.BlockRestartInterval,
|
|
checksumType: o.Checksum,
|
|
indexBlock: newIndexBlockBuf(o.Parallelism),
|
|
rangeDelBlock: blockWriter{
|
|
restartInterval: 1,
|
|
},
|
|
rangeKeyBlock: blockWriter{
|
|
restartInterval: 1,
|
|
},
|
|
topLevelIndexBlock: blockWriter{
|
|
restartInterval: 1,
|
|
},
|
|
fragmenter: keyspan.Fragmenter{
|
|
Cmp: o.Comparer.Compare,
|
|
Format: o.Comparer.FormatKey,
|
|
},
|
|
}
|
|
if w.tableFormat >= TableFormatPebblev3 {
|
|
w.shortAttributeExtractor = o.ShortAttributeExtractor
|
|
w.requiredInPlaceValueBound = o.RequiredInPlaceValueBound
|
|
w.valueBlockWriter = newValueBlockWriter(
|
|
w.blockSize, w.blockSizeThreshold, w.compression, w.checksumType, func(compressedSize int) {
|
|
w.coordination.sizeEstimate.dataBlockCompressed(compressedSize, 0)
|
|
})
|
|
}
|
|
|
|
w.dataBlockBuf = newDataBlockBuf(w.restartInterval, w.checksumType)
|
|
|
|
w.blockBuf = blockBuf{
|
|
checksummer: checksummer{checksumType: o.Checksum},
|
|
}
|
|
|
|
w.coordination.init(o.Parallelism, w)
|
|
|
|
if writable == nil {
|
|
w.err = errors.New("pebble: nil writable")
|
|
return w
|
|
}
|
|
|
|
// Note that WriterOptions are applied in two places; the ones with a
|
|
// preApply() method are applied here. The rest are applied down below after
|
|
// default properties are set.
|
|
type preApply interface{ preApply() }
|
|
for _, opt := range extraOpts {
|
|
if _, ok := opt.(preApply); ok {
|
|
opt.writerApply(w)
|
|
}
|
|
}
|
|
|
|
w.props.PrefixExtractorName = "nullptr"
|
|
if o.FilterPolicy != nil {
|
|
switch o.FilterType {
|
|
case TableFilter:
|
|
w.filter = newTableFilterWriter(o.FilterPolicy)
|
|
if w.split != nil {
|
|
w.props.PrefixExtractorName = o.Comparer.Name
|
|
w.props.PrefixFiltering = true
|
|
} else {
|
|
w.props.WholeKeyFiltering = true
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("unknown filter type: %v", o.FilterType))
|
|
}
|
|
}
|
|
|
|
w.props.ComparerName = o.Comparer.Name
|
|
w.props.CompressionName = o.Compression.String()
|
|
w.props.MergerName = o.MergerName
|
|
w.props.PropertyCollectorNames = "[]"
|
|
w.props.ExternalFormatVersion = rocksDBExternalFormatVersion
|
|
|
|
if len(o.TablePropertyCollectors) > 0 || len(o.BlockPropertyCollectors) > 0 ||
|
|
w.tableFormat >= TableFormatPebblev4 {
|
|
var buf bytes.Buffer
|
|
buf.WriteString("[")
|
|
if len(o.TablePropertyCollectors) > 0 {
|
|
w.propCollectors = make([]TablePropertyCollector, len(o.TablePropertyCollectors))
|
|
for i := range o.TablePropertyCollectors {
|
|
w.propCollectors[i] = o.TablePropertyCollectors[i]()
|
|
if i > 0 {
|
|
buf.WriteString(",")
|
|
}
|
|
buf.WriteString(w.propCollectors[i].Name())
|
|
}
|
|
}
|
|
numBlockPropertyCollectors := len(o.BlockPropertyCollectors)
|
|
if w.tableFormat >= TableFormatPebblev4 {
|
|
numBlockPropertyCollectors++
|
|
}
|
|
// shortID is a uint8, so we cannot exceed that number of block
|
|
// property collectors.
|
|
if numBlockPropertyCollectors > math.MaxUint8 {
|
|
w.err = errors.New("pebble: too many block property collectors")
|
|
return w
|
|
}
|
|
if numBlockPropertyCollectors > 0 {
|
|
w.blockPropCollectors = make([]BlockPropertyCollector, numBlockPropertyCollectors)
|
|
}
|
|
if len(o.BlockPropertyCollectors) > 0 {
|
|
// The shortID assigned to a collector is the same as its index in
|
|
// this slice.
|
|
for i := range o.BlockPropertyCollectors {
|
|
w.blockPropCollectors[i] = o.BlockPropertyCollectors[i]()
|
|
if i > 0 || len(o.TablePropertyCollectors) > 0 {
|
|
buf.WriteString(",")
|
|
}
|
|
buf.WriteString(w.blockPropCollectors[i].Name())
|
|
}
|
|
}
|
|
if w.tableFormat >= TableFormatPebblev4 {
|
|
if numBlockPropertyCollectors > 1 || len(o.TablePropertyCollectors) > 0 {
|
|
buf.WriteString(",")
|
|
}
|
|
w.blockPropCollectors[numBlockPropertyCollectors-1] = &w.obsoleteCollector
|
|
buf.WriteString(w.obsoleteCollector.Name())
|
|
}
|
|
buf.WriteString("]")
|
|
w.props.PropertyCollectorNames = buf.String()
|
|
}
|
|
|
|
// Apply the remaining WriterOptions that do not have a preApply() method.
|
|
for _, opt := range extraOpts {
|
|
if _, ok := opt.(preApply); ok {
|
|
continue
|
|
}
|
|
opt.writerApply(w)
|
|
}
|
|
|
|
// Initialize the range key fragmenter and encoder.
|
|
w.fragmenter.Emit = w.encodeRangeKeySpan
|
|
w.rangeKeyEncoder.Emit = w.addRangeKey
|
|
return w
|
|
}
|
|
|
|
// internalGetProperties is a private, internal-use-only function that takes a
|
|
// Writer and returns a pointer to its Properties, allowing direct mutation.
|
|
// It's used by internal Pebble flushes and compactions to set internal
|
|
// properties. It gets installed in private.
|
|
func internalGetProperties(w *Writer) *Properties {
|
|
return &w.props
|
|
}
|
|
|
|
func init() {
|
|
private.SSTableWriterDisableKeyOrderChecks = func(i interface{}) {
|
|
w := i.(*Writer)
|
|
w.disableKeyOrderChecks = true
|
|
}
|
|
private.SSTableInternalProperties = internalGetProperties
|
|
}
|
|
|
|
type obsoleteKeyBlockPropertyCollector struct {
|
|
blockIsNonObsolete bool
|
|
indexIsNonObsolete bool
|
|
tableIsNonObsolete bool
|
|
}
|
|
|
|
func encodeNonObsolete(isNonObsolete bool, buf []byte) []byte {
|
|
if isNonObsolete {
|
|
return buf
|
|
}
|
|
return append(buf, 't')
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) Name() string {
|
|
return "obsolete-key"
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) Add(key InternalKey, value []byte) error {
|
|
// Ignore.
|
|
return nil
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) AddPoint(isObsolete bool) {
|
|
o.blockIsNonObsolete = o.blockIsNonObsolete || !isObsolete
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) FinishDataBlock(buf []byte) ([]byte, error) {
|
|
o.tableIsNonObsolete = o.tableIsNonObsolete || o.blockIsNonObsolete
|
|
return encodeNonObsolete(o.blockIsNonObsolete, buf), nil
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) AddPrevDataBlockToIndexBlock() {
|
|
o.indexIsNonObsolete = o.indexIsNonObsolete || o.blockIsNonObsolete
|
|
o.blockIsNonObsolete = false
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) FinishIndexBlock(buf []byte) ([]byte, error) {
|
|
indexIsNonObsolete := o.indexIsNonObsolete
|
|
o.indexIsNonObsolete = false
|
|
return encodeNonObsolete(indexIsNonObsolete, buf), nil
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) FinishTable(buf []byte) ([]byte, error) {
|
|
return encodeNonObsolete(o.tableIsNonObsolete, buf), nil
|
|
}
|
|
|
|
func (o *obsoleteKeyBlockPropertyCollector) UpdateKeySuffixes(
|
|
oldProp []byte, oldSuffix, newSuffix []byte,
|
|
) error {
|
|
_, err := propToIsObsolete(oldProp)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Suffix rewriting currently loses the obsolete bit.
|
|
o.blockIsNonObsolete = true
|
|
return nil
|
|
}
|
|
|
|
// NB: obsoleteKeyBlockPropertyFilter is stateless. This aspect of the filter
|
|
// is used in table_cache.go for in-place modification of a filters slice.
|
|
type obsoleteKeyBlockPropertyFilter struct{}
|
|
|
|
func (o obsoleteKeyBlockPropertyFilter) Name() string {
|
|
return "obsolete-key"
|
|
}
|
|
|
|
// Intersects returns true if the set represented by prop intersects with
|
|
// the set in the filter.
|
|
func (o obsoleteKeyBlockPropertyFilter) Intersects(prop []byte) (bool, error) {
|
|
return propToIsObsolete(prop)
|
|
}
|
|
|
|
func propToIsObsolete(prop []byte) (bool, error) {
|
|
if len(prop) == 0 {
|
|
return true, nil
|
|
}
|
|
if len(prop) > 1 || prop[0] != 't' {
|
|
return false, errors.Errorf("unexpected property %x", prop)
|
|
}
|
|
return false, nil
|
|
}
|