类的使用
org.apache.hadoop.hbase.io.encoding.AbstractDataBlockEncoder

使用AbstractDataBlockEncoder的程序包

程序包	说明
org.apache.hadoop.hbase.io.encoding

org.apache.hadoop.hbase.io.encoding中AbstractDataBlockEncoder的使用

org.apache.hadoop.hbase.io.encoding中AbstractDataBlockEncoder的子类

限定符和类型	类和说明
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 - ... bytes: rest of the row (if prefix length is small enough) - ... bytes: qualifier (or suffix depending on prefix length) - 1-8 bytes: timestamp or diff - 1 byte: type (only if FLAG_SAME_TYPE is not set in the flag) - ... bytes: value
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.
class	RowIndexCodecV1 Store cells following every row's start offset, so we can binary search to a row's cells.