org.apache.hadoop.hbase.regionserver

Class BusyRegionSplitPolicy

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.BusyRegionSplitPolicy

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable

@InterfaceAudience.LimitedPrivate(value="Configuration")
public class BusyRegionSplitPolicy
extends IncreasingToUpperBoundRegionSplitPolicy

This class represents a split policy which makes the split decision based on how busy a region is. The metric that is used here is the fraction of total write requests that are blocked due to high memstore utilization. This fractional rate is calculated over a running window of "hbase.busy.policy.aggWindow" milliseconds. The rate is a time-weighted aggregated average of the rate in the current window and the true average rate in the previous window.

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT_AGGREGATION_WINDOW
static float	DEFAULT_MAX_BLOCKED_REQUESTS
static long	DEFAULT_MIN_AGE_MS

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

initialSize

Constructor Summary

Constructors

Constructor and Description
BusyRegionSplitPolicy()

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.
protected boolean	shouldSplit()

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

getSizeToCheck

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

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

DEFAULT_MAX_BLOCKED_REQUESTS

public static final float DEFAULT_MAX_BLOCKED_REQUESTS

See Also:

Constant Field Values

DEFAULT_MIN_AGE_MS

public static final long DEFAULT_MIN_AGE_MS

See Also:

Constant Field Values

DEFAULT_AGGREGATION_WINDOW

public static final long DEFAULT_AGGREGATION_WINDOW

See Also:

Constant Field Values

Constructor Detail

BusyRegionSplitPolicy

public BusyRegionSplitPolicy()

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

shouldSplit

protected boolean shouldSplit()

Overrides:

shouldSplit in class IncreasingToUpperBoundRegionSplitPolicy

Returns:

true if the specified region should be split.