org.apache.hadoop.hbase.regionserver

Class KeyPrefixRegionSplitPolicy

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.hbase.regionserver.RegionSplitPolicy

org.apache.hadoop.hbase.regionserver.ConstantSizeRegionSplitPolicy

org.apache.hadoop.hbase.regionserver.IncreasingToUpperBoundRegionSplitPolicy

org.apache.hadoop.hbase.regionserver.KeyPrefixRegionSplitPolicy

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable

@InterfaceAudience.Private
public class KeyPrefixRegionSplitPolicy
extends IncreasingToUpperBoundRegionSplitPolicy

A custom RegionSplitPolicy implementing a SplitPolicy that groups rows by a prefix of the row-key This ensures that a region is not split "inside" a prefix of a row key. I.e. rows can be co-located in a region by their prefix.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PREFIX_LENGTH_KEY
static String	PREFIX_LENGTH_KEY_DEPRECATED Deprecated.

Fields inherited from class org.apache.hadoop.hbase.regionserver.RegionSplitPolicy

region

Constructor Summary

Constructors

Constructor and Description
KeyPrefixRegionSplitPolicy()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	configureForRegion(HRegion region) Upon construction, this method will be called with the region to be governed.
protected byte[]	getSplitPoint()

Methods inherited from class org.apache.hadoop.hbase.regionserver.IncreasingToUpperBoundRegionSplitPolicy

getSizeToCheck, shouldSplit

Methods inherited from class org.apache.hadoop.hbase.regionserver.RegionSplitPolicy

create

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Field Detail

PREFIX_LENGTH_KEY_DEPRECATED

@Deprecated
public static final String PREFIX_LENGTH_KEY_DEPRECATED

Deprecated.

See Also:

Constant Field Values

PREFIX_LENGTH_KEY

public static final String PREFIX_LENGTH_KEY

See Also:

Constant Field Values

Constructor Detail

KeyPrefixRegionSplitPolicy

public KeyPrefixRegionSplitPolicy()

Method Detail

configureForRegion

protected void configureForRegion(HRegion region)

Description copied from class: RegionSplitPolicy

Upon construction, this method will be called with the region to be governed. It will be called once and only once.

Overrides:

configureForRegion in class IncreasingToUpperBoundRegionSplitPolicy

getSplitPoint

protected byte[] getSplitPoint()

Overrides:

getSplitPoint in class RegionSplitPolicy

Returns:

the key at which the region should be split, or null if it cannot be split. This will only be called if shouldSplit previously returned true.