org.apache.hadoop.hbase.regionserver

Class IncreasingToUpperBoundRegionSplitPolicy

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

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable

Direct Known Subclasses:

BusyRegionSplitPolicy, DelimitedKeyPrefixRegionSplitPolicy, KeyPrefixRegionSplitPolicy, SteppingSplitPolicy

@InterfaceAudience.Private
public class IncreasingToUpperBoundRegionSplitPolicy
extends ConstantSizeRegionSplitPolicy

Split size is the number of regions that are on this server that all are of the same table, cubed, times 2x the region flush size OR the maximum region split size, whichever is smaller.

For example, if the flush size is 128MB, then after two flushes (256MB) we will split which will make two regions that will split when their size is 2^3 * 128MB*2 = 2048MB.

If one of these regions splits, then there are three regions and now the split size is 3^3 * 128MB*2 = 6912MB, and so on until we reach the configured maximum file size and then from there on out, we'll use that.

Field Summary

Fields

Modifier and Type	Field and Description
protected long	initialSize
private static org.slf4j.Logger	LOG

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

region

Constructor Summary

Constructors

Constructor and Description
IncreasingToUpperBoundRegionSplitPolicy()

Method Summary

Modifier and Type	Method and Description
protected void	configureForRegion(HRegion region) Upon construction, this method will be called with the region to be governed.
private int	getCountOfCommonTableRegions()
protected long	getSizeToCheck(int tableRegionsCount)
protected boolean	shouldSplit()

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

getDesiredMaxFileSize, positiveJitterRate

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

create, getSplitPoint, getSplitPolicyClass, skipStoreFileRangeCheck

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

LOG

private static final org.slf4j.Logger LOG

initialSize

protected long initialSize

Constructor Detail

IncreasingToUpperBoundRegionSplitPolicy

public IncreasingToUpperBoundRegionSplitPolicy()

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 ConstantSizeRegionSplitPolicy

shouldSplit

protected boolean shouldSplit()

Overrides:

shouldSplit in class ConstantSizeRegionSplitPolicy

Returns:

true if the specified region should be split.

getCountOfCommonTableRegions

private int getCountOfCommonTableRegions()

Returns:

Count of regions on this server that share the table this.region belongs to

getSizeToCheck

protected long getSizeToCheck(int tableRegionsCount)

Returns:

Region max size or count of regions cubed * 2 * flushsize, which ever is smaller; guard against there being zero regions on this server.