BusyRegionSplitPolicy (Apache HBase 1.4.11 API)

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Detail:
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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

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 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, 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.

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