chunkenc

package
v2.4.3 Latest Latest
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 Go to latest Published: Feb 9, 2022 License: AGPL-3.0 Imports: 35 Imported by: 0

README

Chunk format

  |                 |             |
  | MagicNumber(4b) | version(1b) |
  |                 |             |
  --------------------------------------------------
  |         block-1 bytes         |  checksum (4b) |
  --------------------------------------------------
  |         block-2 bytes         |  checksum (4b) |
  --------------------------------------------------
  |         block-n bytes         |  checksum (4b) |
  --------------------------------------------------
  |         #blocks (uvarint)                      |
  --------------------------------------------------
  | #entries(uvarint) | mint, maxt (varint) | offset, len (uvarint) | uncompressedSize (uvarint) |
  ------------------------------------------------------------------------------------------------
  | #entries(uvarint) | mint, maxt (varint) | offset, len (uvarint) | uncompressedSize (uvarint) |
  ------------------------------------------------------------------------------------------------
  | #entries(uvarint) | mint, maxt (varint) | offset, len (uvarint) | uncompressedSize (uvarint) |
  ------------------------------------------------------------------------------------------------
  | #entries(uvarint) | mint, maxt (varint) | offset, len (uvarint) | uncompressedSize (uvarint) |
  ------------------------------------------------------------------------------------------------
  |                      checksum(from #blocks)                     |
  -------------------------------------------------------------------
  | metasOffset - offset to the point with #blocks |
  --------------------------------------------------

Documentation

Index

Constants

View Source 
const (
	DefaultChunkFormat = chunkFormatV3 // the currently used chunk format

)
View Source 
const GzipLogChunk = encoding.Encoding(128)

GzipLogChunk is a cortex encoding type for our chunks. Deprecated: the chunk encoding/compression format is inside the chunk data.

View Source 
const LogChunk = encoding.Encoding(129)

LogChunk is a cortex encoding type for our chunks.

Variables

View Source 
var (
	ErrChunkFull       = errors.New("chunk full")
	ErrOutOfOrder      = errors.New("entry out of order")
	ErrTooFarBehind    = errors.New("entry too far behind")
	ErrInvalidSize     = errors.New("invalid size")
	ErrInvalidFlag     = errors.New("invalid flag")
	ErrInvalidChecksum = errors.New("invalid chunk checksum")
)

Errors returned by the chunk interface.

View Source 
var (
	// Gzip is the gnu zip compression pool
	Gzip     = GzipPool{/* contains filtered or unexported fields */}
	Lz4_64k  = LZ4Pool{/* contains filtered or unexported fields */} // Lz4_64k is the l4z compression pool, with 64k buffer size
	Lz4_256k = LZ4Pool{/* contains filtered or unexported fields */} // Lz4_256k uses 256k buffer
	Lz4_1M   = LZ4Pool{/* contains filtered or unexported fields */} // Lz4_1M uses 1M buffer
	Lz4_4M   = LZ4Pool{/* contains filtered or unexported fields */} // Lz4_4M uses 4M buffer
	Flate    = FlatePool{}
	Zstd     = ZstdPool{}
	// Snappy is the snappy compression pool
	Snappy SnappyPool
	// Noop is the no compression pool
	Noop NoopPool

	// BufReaderPool is bufio.Reader pool
	BufReaderPool = &BufioReaderPool{
		pool: sync.Pool{
			New: func() interface{} { return bufio.NewReader(nil) },
		},
	}

	// BytesBufferPool is a bytes buffer used for lines decompressed.
	// Buckets [0.5KB,1KB,2KB,4KB,8KB]
	BytesBufferPool = pool.New(1<<9, 1<<13, 2, func(size int) interface{} { return make([]byte, 0, size) })

	// SamplesPool pooling array of samples [512,1024,...,16k]
	SamplesPool = pool.New(1<<9, 1<<14, 2, func(size int) interface{} { return make([]logproto.Sample, 0, size) })

	// EncodeBufferPool is a pool used to binary encode.
	EncodeBufferPool = sync.Pool{
		New: func() interface{} {
			return &encbuf{
				b: make([]byte, 0, 256),
			}
		},
	}
)
View Source 
var HeadBlockFmts = []HeadBlockFmt{OrderedHeadBlockFmt, UnorderedHeadBlockFmt}

Functions

func IsOutOfOrderErr 

func IsOutOfOrderErr(err error) bool

func NewFacade 

func NewFacade(c Chunk, blockSize, targetSize int) encoding.Chunk

NewFacade makes a new Facade.

func SupportedEncoding 

func SupportedEncoding() string

SupportedEncoding returns the list of supported Encoding.

func UncompressedSize 

func UncompressedSize(c encoding.Chunk) (int, bool)

UncompressedSize is a helper function to hide the type assertion kludge when wanting the uncompressed size of the Cortex interface encoding.Chunk.

Types

type Block 

type Block interface {
	// MinTime is the minimum time of entries in the block
	MinTime() int64
	// MaxTime is the maximum time of entries in the block
	MaxTime() int64
	// Offset is the offset/position of the block in the chunk. Offset is unique for a given block per chunk.
	Offset() int
	// Entries is the amount of entries in the block.
	Entries() int
	// Iterator returns an entry iterator for the block.
	Iterator(ctx context.Context, pipeline log.StreamPipeline) iter.EntryIterator
	// SampleIterator returns a sample iterator for the block.
	SampleIterator(ctx context.Context, extractor log.StreamSampleExtractor) iter.SampleIterator
}

Block is a chunk block.

type BufioReaderPool 

type BufioReaderPool struct {
	// contains filtered or unexported fields
}

BufioReaderPool is a bufio reader that uses sync.Pool.

func (*BufioReaderPool) Get 

func (bufPool *BufioReaderPool) Get(r io.Reader) *bufio.Reader

Get returns a bufio.Reader which reads from r. The buffer size is that of the pool.

func (*BufioReaderPool) Put 

func (bufPool *BufioReaderPool) Put(b *bufio.Reader)

Put puts the bufio.Reader back into the pool.

type Chunk 

type Chunk interface {
	Bounds() (time.Time, time.Time)
	SpaceFor(*logproto.Entry) bool
	Append(*logproto.Entry) error
	Iterator(ctx context.Context, mintT, maxtT time.Time, direction logproto.Direction, pipeline log.StreamPipeline) (iter.EntryIterator, error)
	SampleIterator(ctx context.Context, from, through time.Time, extractor log.StreamSampleExtractor) iter.SampleIterator
	// Returns the list of blocks in the chunks.
	Blocks(mintT, maxtT time.Time) []Block
	// Size returns the number of entries in a chunk
	Size() int
	Bytes() ([]byte, error)
	BytesWith([]byte) ([]byte, error) // uses provided []byte for buffer instantiation
	io.WriterTo
	BlockCount() int
	Utilization() float64
	UncompressedSize() int
	CompressedSize() int
	Close() error
	Encoding() Encoding
	Rebound(start, end time.Time) (Chunk, error)
}

Chunk is the interface for the compressed logs chunk format.

func NewDumbChunk 

func NewDumbChunk() Chunk

NewDumbChunk returns a new chunk that isn't very good.

type Encoding 

type Encoding byte

Encoding is the identifier for a chunk encoding. 

const (
	EncNone Encoding = iota
	EncGZIP
	EncDumb
	EncLZ4_64k
	EncSnappy
	EncLZ4_256k
	EncLZ4_1M
	EncLZ4_4M
	EncFlate
	EncZstd
)

The different available encodings. Make sure to preserve the order, as these numeric values are written to the chunks!

func ParseEncoding 

func ParseEncoding(enc string) (Encoding, error)

ParseEncoding parses an chunk encoding (compression algorithm) by its name.

func (Encoding) String 

func (e Encoding) String() string

type Facade 

type Facade struct {
	encoding.Chunk
	// contains filtered or unexported fields
}

Facade for compatibility with cortex chunk type, so we can use its chunk store.

func (Facade) Encoding 

func (Facade) Encoding() encoding.Encoding

Encoding implements encoding.Chunk.

func (Facade) LokiChunk 

func (f Facade) LokiChunk() Chunk

LokiChunk returns the chunkenc.Chunk.

func (Facade) Marshal 

func (f Facade) Marshal(w io.Writer) error

Marshal implements encoding.Chunk.

func (Facade) Rebound 

func (f Facade) Rebound(start, end model.Time) (encoding.Chunk, error)

func (Facade) Size 

func (f Facade) Size() int

Size implements encoding.Chunk.

func (*Facade) UnmarshalFromBuf 

func (f *Facade) UnmarshalFromBuf(buf []byte) error

UnmarshalFromBuf implements encoding.Chunk.

func (Facade) Utilization 

func (f Facade) Utilization() float64

Utilization implements encoding.Chunk.

type FlatePool 

type FlatePool struct {
	// contains filtered or unexported fields
}

FlatePool is a flate compression pool

func (*FlatePool) GetReader 

func (pool *FlatePool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*FlatePool) GetWriter 

func (pool *FlatePool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*FlatePool) PutReader 

func (pool *FlatePool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*FlatePool) PutWriter 

func (pool *FlatePool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

type GzipPool 

type GzipPool struct {
	// contains filtered or unexported fields
}

GzipPool is a gun zip compression pool

func (*GzipPool) GetReader 

func (pool *GzipPool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*GzipPool) GetWriter 

func (pool *GzipPool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*GzipPool) PutReader 

func (pool *GzipPool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*GzipPool) PutWriter 

func (pool *GzipPool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

type HeadBlock 

type HeadBlock interface {
	IsEmpty() bool
	CheckpointTo(w io.Writer) error
	CheckpointBytes(b []byte) ([]byte, error)
	CheckpointSize() int
	LoadBytes(b []byte) error
	Serialise(pool WriterPool) ([]byte, error)
	Reset()
	Bounds() (mint, maxt int64)
	Entries() int
	UncompressedSize() int
	Convert(HeadBlockFmt) (HeadBlock, error)
	Append(int64, string) error
	Iterator(
		ctx context.Context,
		direction logproto.Direction,
		mint,
		maxt int64,
		pipeline log.StreamPipeline,
	) iter.EntryIterator
	SampleIterator(
		ctx context.Context,
		mint,
		maxt int64,
		extractor log.StreamSampleExtractor,
	) iter.SampleIterator
	Format() HeadBlockFmt
}

func HeadFromCheckpoint 

func HeadFromCheckpoint(b []byte, desired HeadBlockFmt) (HeadBlock, error)

HeadFromCheckpoint handles reading any head block format and returning the desired form. This is particularly helpful replaying WALs from different configurations such as after enabling unordered writes.

type HeadBlockFmt 

type HeadBlockFmt byte
const (
	OrderedHeadBlockFmt HeadBlockFmt
	UnorderedHeadBlockFmt
)

func (HeadBlockFmt) Byte 

func (f HeadBlockFmt) Byte() byte

func (HeadBlockFmt) NewBlock 

func (f HeadBlockFmt) NewBlock() HeadBlock

func (HeadBlockFmt) String 

func (f HeadBlockFmt) String() string

type LZ4Pool 

type LZ4Pool struct {
	// contains filtered or unexported fields
}

func (*LZ4Pool) GetReader 

func (pool *LZ4Pool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*LZ4Pool) GetWriter 

func (pool *LZ4Pool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*LZ4Pool) PutReader 

func (pool *LZ4Pool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*LZ4Pool) PutWriter 

func (pool *LZ4Pool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

type MemChunk 

type MemChunk struct {
	// contains filtered or unexported fields
}

MemChunk implements compressed log chunks.

func MemchunkFromCheckpoint 

func MemchunkFromCheckpoint(chk, head []byte, desired HeadBlockFmt, blockSize, targetSize int) (*MemChunk, error)

func NewByteChunk 

func NewByteChunk(b []byte, blockSize, targetSize int) (*MemChunk, error)

NewByteChunk returns a MemChunk on the passed bytes.

func NewMemChunk 

func NewMemChunk(enc Encoding, head HeadBlockFmt, blockSize, targetSize int) *MemChunk

NewMemChunk returns a new in-mem chunk.

func (*MemChunk) Append 

func (c *MemChunk) Append(entry *logproto.Entry) error

Append implements Chunk.

func (*MemChunk) BlockCount 

func (c *MemChunk) BlockCount() int

BlockCount implements Chunk.

func (*MemChunk) Blocks 

func (c *MemChunk) Blocks(mintT, maxtT time.Time) []Block

Blocks implements Chunk

func (*MemChunk) Bounds 

func (c *MemChunk) Bounds() (fromT, toT time.Time)

Bounds implements Chunk.

func (*MemChunk) Bytes 

func (c *MemChunk) Bytes() ([]byte, error)

Bytes implements Chunk. NOTE: Does not cut head block or include any head block data.

func (*MemChunk) BytesSize 

func (c *MemChunk) BytesSize() int

BytesSize returns the raw size of the chunk. NOTE: This does not account for the head block nor include any head block data.

func (*MemChunk) BytesWith 

func (c *MemChunk) BytesWith(b []byte) ([]byte, error)

BytesWith uses a provided []byte for buffer instantiation NOTE: This does not cut the head block nor include any head block data.

func (*MemChunk) CheckpointSize 

func (c *MemChunk) CheckpointSize() (chunk, head int)

func (*MemChunk) Close 

func (c *MemChunk) Close() error

Close implements Chunk. TODO: Fix this to check edge cases.

func (*MemChunk) CompressedSize 

func (c *MemChunk) CompressedSize() int

CompressedSize implements Chunk.

func (*MemChunk) ConvertHead 

func (c *MemChunk) ConvertHead(desired HeadBlockFmt) error

func (*MemChunk) Encoding 

func (c *MemChunk) Encoding() Encoding

Encoding implements Chunk.

func (*MemChunk) Iterator 

func (c *MemChunk) Iterator(ctx context.Context, mintT, maxtT time.Time, direction logproto.Direction, pipeline log.StreamPipeline) (iter.EntryIterator, error)

Iterator implements Chunk.

func (*MemChunk) Rebound 

func (c *MemChunk) Rebound(start, end time.Time) (Chunk, error)

Rebound builds a smaller chunk with logs having timestamp from start and end(both inclusive)

func (*MemChunk) SampleIterator 

func (c *MemChunk) SampleIterator(ctx context.Context, from, through time.Time, extractor log.StreamSampleExtractor) iter.SampleIterator

Iterator implements Chunk.

func (*MemChunk) SerializeForCheckpointTo 

func (c *MemChunk) SerializeForCheckpointTo(chk, head io.Writer) error

SerializeForCheckpointTo serialize the chunk & head into different `io.Writer` for checkpointing use. This is to ensure eventually flushed chunks don't have different substructures depending on when they were checkpointed. In turn this allows us to maintain a more effective dedupe ratio in storage.

func (*MemChunk) Size 

func (c *MemChunk) Size() int

Size implements Chunk.

func (*MemChunk) SpaceFor 

func (c *MemChunk) SpaceFor(e *logproto.Entry) bool

SpaceFor implements Chunk.

func (*MemChunk) UncompressedSize 

func (c *MemChunk) UncompressedSize() int

UncompressedSize implements Chunk.

func (*MemChunk) Utilization 

func (c *MemChunk) Utilization() float64

Utilization implements Chunk.

func (*MemChunk) WriteTo 

func (c *MemChunk) WriteTo(w io.Writer) (int64, error)

WriteTo Implements io.WriterTo NOTE: Does not cut head block or include any head block data. For this to be the case you must call Close() first. This decision notably enables WAL checkpointing, which would otherwise result in different content addressable chunks in storage based on the timing of when they were checkpointed (which would cause new blocks to be cut early).

type NoopPool 

type NoopPool struct{}

func (*NoopPool) GetReader 

func (pool *NoopPool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*NoopPool) GetWriter 

func (pool *NoopPool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*NoopPool) PutReader 

func (pool *NoopPool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*NoopPool) PutWriter 

func (pool *NoopPool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

type ReaderPool 

type ReaderPool interface {
	GetReader(io.Reader) io.Reader
	PutReader(io.Reader)
}

ReaderPool similar to WriterPool but for reading chunks.

type SnappyPool 

type SnappyPool struct {
	// contains filtered or unexported fields
}

func (*SnappyPool) GetReader 

func (pool *SnappyPool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*SnappyPool) GetWriter 

func (pool *SnappyPool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*SnappyPool) PutReader 

func (pool *SnappyPool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*SnappyPool) PutWriter 

func (pool *SnappyPool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

type WriterPool 

type WriterPool interface {
	GetWriter(io.Writer) io.WriteCloser
	PutWriter(io.WriteCloser)
}

WriterPool is a pool of io.Writer This is used by every chunk to avoid unnecessary allocations.

type ZstdPool 

type ZstdPool struct {
	// contains filtered or unexported fields
}

GzipPool is a gun zip compression pool

func (*ZstdPool) GetReader 

func (pool *ZstdPool) GetReader(src io.Reader) io.Reader

GetReader gets or creates a new CompressionReader and reset it to read from src

func (*ZstdPool) GetWriter 

func (pool *ZstdPool) GetWriter(dst io.Writer) io.WriteCloser

GetWriter gets or creates a new CompressionWriter and reset it to write to dst

func (*ZstdPool) PutReader 

func (pool *ZstdPool) PutReader(reader io.Reader)

PutReader places back in the pool a CompressionReader

func (*ZstdPool) PutWriter 

func (pool *ZstdPool) PutWriter(writer io.WriteCloser)

PutWriter places back in the pool a CompressionWriter

Source Files

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