Package org.apache.lucene.sandbox.index

Class MergeOnFlushMergePolicy

java.lang.Object

org.apache.lucene.index.MergePolicy

org.apache.lucene.index.FilterMergePolicy

org.apache.lucene.sandbox.index.MergeOnFlushMergePolicy

All Implemented Interfaces:

Unwrappable<MergePolicy>

public class MergeOnFlushMergePolicy
extends FilterMergePolicy

A simple extension to wrap MergePolicy to merge all tiny segments (or at least segments smaller than specified in setSmallSegmentThresholdMB(double) into one segment on commit.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.MergePolicy

MergePolicy.MergeAbortedException, MergePolicy.MergeContext, MergePolicy.MergeException, MergePolicy.MergeSpecification, MergePolicy.OneMerge, MergePolicy.OneMergeProgress

Field Summary

Fields inherited from class org.apache.lucene.index.FilterMergePolicy

in

Fields inherited from class org.apache.lucene.index.MergePolicy

DEFAULT_MAX_CFS_SEGMENT_SIZE, DEFAULT_NO_CFS_RATIO, maxCFSSegmentSize, noCFSRatio

Constructor Summary

Constructors

Constructor	Description
MergeOnFlushMergePolicy(MergePolicy mergePolicy)	Creates a MergeOnFlushMergePolicy merge policy instance wrapping another.

Method Summary

Modifier and Type	Method	Description
MergePolicy.MergeSpecification	findFullFlushMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos, MergePolicy.MergeContext mergeContext)
double	getSmallSegmentThresholdMB()
void	setSmallSegmentThresholdMB(double smallSegmentThresholdMB)

Methods inherited from class org.apache.lucene.index.FilterMergePolicy

findForcedDeletesMerges, findForcedMerges, findMerges, getMaxCFSSegmentSizeMB, getNoCFSRatio, keepFullyDeletedSegment, numDeletesToMerge, setMaxCFSSegmentSizeMB, setNoCFSRatio, size, toString, unwrap, useCompoundFile

Methods inherited from class org.apache.lucene.index.MergePolicy

assertDelCount, isMerged, message, segString, verbose

Methods inherited from class java.lang.Object

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

Constructor Details

MergeOnFlushMergePolicy

public MergeOnFlushMergePolicy(MergePolicy mergePolicy)

Creates a MergeOnFlushMergePolicy merge policy instance wrapping another.

Parameters:

mergePolicy - the wrapped MergePolicy

Method Details

getSmallSegmentThresholdMB

public double getSmallSegmentThresholdMB()

setSmallSegmentThresholdMB

public void setSmallSegmentThresholdMB(double smallSegmentThresholdMB)

Parameters:

smallSegmentThresholdMB - all segments smaller than this will be merged into a single segment before commit completes.

findFullFlushMerges

public MergePolicy.MergeSpecification findFullFlushMerges(MergeTrigger mergeTrigger,
 SegmentInfos segmentInfos,
 MergePolicy.MergeContext mergeContext)
                                                   throws IOException

Overrides:

findFullFlushMerges in class FilterMergePolicy

Throws:

IOException