org.apache.hadoop.hbase
Class KeyValue.MetaKeyComparator

java.lang.Object
  org.apache.hadoop.hbase.KeyValue.KeyComparator
      org.apache.hadoop.hbase.KeyValue.MetaKeyComparator

All Implemented Interfaces:

Comparator<byte[]>, KeyValue.SamePrefixComparator<byte[]>, org.apache.hadoop.io.RawComparator<byte[]>

Enclosing class:

KeyValue

public static class KeyValue.MetaKeyComparator
extends KeyValue.KeyComparator

Compare key portion of a KeyValue for keys in .META. table.

Constructor Summary

KeyValue.MetaKeyComparator()

Method Summary

protected int	compareRowid(byte[] left, int loffset, int llength, byte[] right, int roffset, int rlength)
int	compareRows(byte[] left, int loffset, int llength, byte[] right, int roffset, int rlength)
byte[]	getShortMidpointKey(byte[] leftKey, byte[] rightKey) Generate a faked byte array if possible.

Methods inherited from class org.apache.hadoop.hbase.KeyValue.KeyComparator

compare, compare, compareColumns, compareIgnoringPrefix

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

KeyValue.MetaKeyComparator

public KeyValue.MetaKeyComparator()

Method Detail

compareRows

public int compareRows(byte[] left,
                       int loffset,
                       int llength,
                       byte[] right,
                       int roffset,
                       int rlength)

Overrides:

compareRows in class KeyValue.KeyComparator

getShortMidpointKey

public byte[] getShortMidpointKey(byte[] leftKey,
                                  byte[] rightKey)

Description copied from class: KeyValue.KeyComparator

Generate a faked byte array if possible. It aims to: 1)reduce key length, which expects to reduce HFile index memory footprint 2)replace TS field with LATEST_TIMESTAMP(to avoid seeking previous block) see HBASE-7845 for more details we need to ensure: leftKey < newKey <= rightKey

Overrides:

getShortMidpointKey in class KeyValue.KeyComparator

Parameters:

leftKey - the previous block's real stop key usually

rightKey - the current block's real start key usually

Returns:

newKey: the newly generated faked key

compareRowid

protected int compareRowid(byte[] left,
                           int loffset,
                           int llength,
                           byte[] right,
                           int roffset,
                           int rlength)