org.apache.jackrabbit.oak.plugins.document

Class VersionGCRecommendations

java.lang.Object

org.apache.jackrabbit.oak.plugins.document.VersionGCRecommendations

public class VersionGCRecommendations
extends java.lang.Object

Gives a recommendation about parameters for the next revision garbage collection run.

Constructor Summary

Constructors

Constructor and Description

VersionGCRecommendations(long maxRevisionAgeMs, org.apache.jackrabbit.oak.plugins.document.Checkpoints checkpoints, Clock clock, VersionGCSupport vgc, VersionGCOptions options, GCMonitor gcMonitor) With the given maximum age of revisions to keep (earliest time in the past to collect), the desired precision in which times shall be sliced and the given limit on the number of collected documents in one run, calculate if gc shall run at all (ignoreDueToCheckPoint) in which time interval documents shall be collected (scope) if collection should fail if it reaches maxCollect documents, maxCollect will specify the limit or be 0 if no limit shall be enforced. After a run, recommendations evaluate the result of the gc to update its persisted recommendations for future runs.

Method Summary

Modifier and Type	Method and Description
void	evaluate(VersionGarbageCollector.VersionGCStats stats) Evaluate the results of the last run.

Methods inherited from class java.lang.Object

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

Constructor Detail

VersionGCRecommendations

public VersionGCRecommendations(long maxRevisionAgeMs,
                                org.apache.jackrabbit.oak.plugins.document.Checkpoints checkpoints,
                                Clock clock,
                                VersionGCSupport vgc,
                                VersionGCOptions options,
                                GCMonitor gcMonitor)

With the given maximum age of revisions to keep (earliest time in the past to collect), the desired precision in which times shall be sliced and the given limit on the number of collected documents in one run, calculate

1. if gc shall run at all (ignoreDueToCheckPoint)
2. in which time interval documents shall be collected (scope)
3. if collection should fail if it reaches maxCollect documents, maxCollect will specify the limit or be 0 if no limit shall be enforced.

After a run, recommendations evaluate the result of the gc to update its persisted recommendations for future runs.

In the settings collection, recommendations keeps "revisionsOlderThan" from the last successful run. It also updates the time interval recommended for the next run.

Parameters:

maxRevisionAgeMs - the minimum age for revisions to be collected

checkpoints - checkpoints from DocumentNodeStore

clock - clock from DocumentNodeStore

vgc - VersionGC support class

options - options for running the gc

gcMonitor - monitor class for messages

Method Detail

evaluate

public void evaluate(VersionGarbageCollector.VersionGCStats stats)

Evaluate the results of the last run. Update recommendations for future runs. Will set VersionGarbageCollector.VersionGCStats.needRepeat if collection needs to run another iteration for collecting documents up to "now".

Parameters:

stats - the statistics from the last run