KeyPrefixRegionSplitPolicy (Apache HBase 1.2.12 API)

All Classes

Summary:
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Field |
Constr |
Method

Detail:
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Constr |
Method

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
`private static org.apache.commons.logging.Log`	`LOG`
`static String`	`PREFIX_LENGTH_KEY`
`static String`	`PREFIX_LENGTH_KEY_DEPRECATED` Deprecated.
`private int`	`prefixLength`

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

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.ConstantSizeRegionSplitPolicy
getDesiredMaxFileSize, positiveJitterRate

Methods inherited from class org.apache.hadoop.hbase.regionserver.RegionSplitPolicy
create, 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
  - LOG
```
private static final org.apache.commons.logging.Log LOG
```
  - 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
  - prefixLength
```
private int prefixLength
```
- 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.

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