Package | Description |
---|---|
org.apache.hadoop.hbase.io.encoding |
Modifier and Type | Class and Description |
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class |
CopyKeyDataBlockEncoder
Just copy data, do not do any kind of compression.
|
class |
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 - ...
|
class |
FastDiffDeltaEncoder
Encoder similar to
DiffKeyDeltaEncoder but supposedly faster. |
class |
PrefixKeyDeltaEncoder
Compress key by storing size of common prefix with previous KeyValue and storing raw size of
rest.
|
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