CompactionPolicy (Apache HBase 1.2.12 API)

All Classes

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java.lang.Object
- org.apache.hadoop.hbase.regionserver.compactions.CompactionPolicy

Direct Known Subclasses:

RatioBasedCompactionPolicy, StripeCompactionPolicy
```
@InterfaceAudience.Private
public abstract class CompactionPolicy
extends Object
```
A compaction policy determines how to select files for compaction, how to compact them, and how to generate the compacted files.

Field Summary

Fields
Modifier and Type Field and Description

protected CompactionConfiguration comConf

protected StoreConfigInformation storeConfigInfo

Constructor Summary

Constructors
Constructor and Description

CompactionPolicy(org.apache.hadoop.conf.Configuration conf, StoreConfigInformation storeConfigInfo)

Method Summary

Methods
Modifier and Type	Method and Description
`CompactionConfiguration`	`getConf()`
`abstract boolean`	`isMajorCompaction(Collection<StoreFile> filesToCompact)`
`void`	`setConf(org.apache.hadoop.conf.Configuration conf)` Inform the policy that some configuration has been change, so cached value should be updated it any.
`abstract boolean`	`throttleCompaction(long compactionSize)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

comConf

protected CompactionConfiguration comConf

storeConfigInfo

protected StoreConfigInformation storeConfigInfo

Constructor Detail

CompactionPolicy

public CompactionPolicy(org.apache.hadoop.conf.Configuration conf,
                StoreConfigInformation storeConfigInfo)

Method Detail
- isMajorCompaction
```
public abstract boolean isMajorCompaction(Collection<StoreFile> filesToCompact)
                                   throws IOException
```
  Parameters:
  filesToCompact - Files to compact. Can be null.
  
  Returns:
  True if we should run a major compaction.
  
  Throws:
  
  IOException
- throttleCompaction
```
public abstract boolean throttleCompaction(long compactionSize)
```
  Parameters:
  compactionSize - Total size of some compaction
  
  Returns:
  whether this should be a large or small compaction
- setConf
```
public void setConf(org.apache.hadoop.conf.Configuration conf)
```
  Inform the policy that some configuration has been change, so cached value should be updated it any.
- getConf
```
public CompactionConfiguration getConf()
```
  Returns:
  The current compaction configuration settings.

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