Interface | Description |
---|---|
DataBlockEncoder |
Encoding of KeyValue.
|
DataBlockEncoder.EncodedSeeker |
An interface which enable to seek while underlying data is encoded.
|
Class | Description |
---|---|
CopyKeyDataBlockEncoder |
Just copy data, do not do any kind of compression.
|
DiffKeyDeltaEncoder |
Compress using:
- store size of common prefix
- save column family once, it is same within HFile
- use integer compression for key, value and prefix (7-bit encoding)
- use bits to avoid duplication key length, value length
and type if it same as previous
- store in 3 bits length of timestamp field
- allow diff in timestamp instead of actual value
Format:
- 1 byte: flag
- 1-5 bytes: key length (only if FLAG_SAME_KEY_LENGTH is not set in flag)
- 1-5 bytes: value length (only if FLAG_SAME_VALUE_LENGTH is not set in flag)
- 1-5 bytes: prefix length
- ...
|
DiffKeyDeltaEncoder.DiffCompressionState | |
DiffKeyDeltaEncoder.DiffSeekerState | |
EncodedDataBlock |
Encapsulates a data block compressed using a particular encoding algorithm.
|
FastDiffDeltaEncoder |
Encoder similar to
DiffKeyDeltaEncoder but supposedly faster. |
FastDiffDeltaEncoder.FastDiffSeekerState | |
PrefixKeyDeltaEncoder |
Compress key by storing size of common prefix with previous KeyValue
and storing raw size of rest.
|
Enum | Description |
---|---|
DataBlockEncoding |
Provide access to all data block encoding algorithms.
|
Exception | Description |
---|---|
EncoderBufferTooSmallException |
Internal error which indicates a bug in a data block encoding algorithm.
|
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