Package org.apache.accumulo.tserver.compaction

Class DefaultCompactionStrategy

java.lang.Object

org.apache.accumulo.tserver.compaction.CompactionStrategy

org.apache.accumulo.tserver.compaction.DefaultCompactionStrategy

Direct Known Subclasses:

BasicCompactionStrategy, SizeLimitCompactionStrategy, TooManyDeletesCompactionStrategy

public class DefaultCompactionStrategy
extends CompactionStrategy

Constructor Summary

Constructors

Constructor	Description
DefaultCompactionStrategy()

Method Summary

Modifier and Type	Method	Description
CompactionPlan	getCompactionPlan(MajorCompactionRequest request)	Get the plan for compacting a tablets files.
boolean	shouldCompact(MajorCompactionRequest request)	Determine if this tablet is eligible for a major compaction.

Methods inherited from class org.apache.accumulo.tserver.compaction.CompactionStrategy

gatherInformation, init

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultCompactionStrategy

public DefaultCompactionStrategy()

Method Detail

shouldCompact

public boolean shouldCompact(MajorCompactionRequest request)

Description copied from class: CompactionStrategy

Determine if this tablet is eligible for a major compaction. It's ok if it later determines (through CompactionStrategy.gatherInformation(MajorCompactionRequest) and CompactionStrategy.getCompactionPlan(MajorCompactionRequest)) that it does not need to. Any state stored during shouldCompact will no longer exist when CompactionStrategy.gatherInformation(MajorCompactionRequest) and CompactionStrategy.getCompactionPlan(MajorCompactionRequest) are called.

Called while holding the tablet lock, so it should not be doing any blocking.

Since no blocking should be done in this method, then its unexpected that this method will throw IOException. However since its in the API, it can not be easily removed.

Specified by:

shouldCompact in class CompactionStrategy

getCompactionPlan

public CompactionPlan getCompactionPlan(MajorCompactionRequest request)

Description copied from class: CompactionStrategy

Get the plan for compacting a tablets files. Called while holding the tablet lock, so it should not be doing any blocking.

Since no blocking should be done in this method, then its unexpected that this method will throw IOException. However since its in the API, it can not be easily removed.

Specified by:

getCompactionPlan in class CompactionStrategy

Parameters:

request - basic details about the tablet

Returns:

the plan for a major compaction, or null to cancel the compaction.