org.apache.accumulo.tserver.compaction.strategies

Class ConfigurableCompactionStrategy

java.lang.Object

org.apache.accumulo.tserver.compaction.CompactionStrategy

org.apache.accumulo.tserver.compaction.strategies.ConfigurableCompactionStrategy

public class ConfigurableCompactionStrategy
extends CompactionStrategy

Constructor Summary

Constructors

Constructor and Description
ConfigurableCompactionStrategy()

Method Summary

Methods

Modifier and Type	Method and Description
CompactionPlan	getCompactionPlan(MajorCompactionRequest request) Get the plan for compacting a tablets files.
void	init(Map<String,String> options) The settings for the compaction strategy pulled from zookeeper.
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

Methods inherited from class java.lang.Object

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

Constructor Detail

ConfigurableCompactionStrategy

public ConfigurableCompactionStrategy()

Method Detail

init

public void init(Map<String,String> options)

Description copied from class: CompactionStrategy

The settings for the compaction strategy pulled from zookeeper. The table.compacations.major.strategy.opts part of the setting will be removed.

Overrides:

init in class CompactionStrategy

shouldCompact

public boolean shouldCompact(MajorCompactionRequest request)
                      throws IOException

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

Throws:

IOException

getCompactionPlan

public CompactionPlan getCompactionPlan(MajorCompactionRequest request)
                                 throws IOException

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.

Throws:

IOException