org.apache.lucene.index

Class ForceMergePolicy

java.lang.Object

org.apache.lucene.index.MergePolicy

org.apache.lucene.index.FilterMergePolicy

org.apache.lucene.index.ForceMergePolicy

public final class ForceMergePolicy
extends FilterMergePolicy

A MergePolicy that only returns forced merges.

NOTE: Use this policy if you wish to disallow background merges but wish to run optimize/forceMerge segment merges.

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 and Description
ForceMergePolicy(MergePolicy in) Create a new ForceMergePolicy around the given MergePolicy

Method Summary

Modifier and Type	Method and Description
MergePolicy.MergeSpecification	findMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos, MergePolicy.MergeContext mergeContext) Determine what set of merge operations are now necessary on the index.

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

findForcedDeletesMerges, findForcedMerges, getMaxCFSSegmentSizeMB, getNoCFSRatio, keepFullyDeletedSegment, numDeletesToMerge, setMaxCFSSegmentSizeMB, setNoCFSRatio, size, toString, 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 Detail

ForceMergePolicy

public ForceMergePolicy(MergePolicy in)

Create a new ForceMergePolicy around the given MergePolicy

Method Detail

findMerges

public MergePolicy.MergeSpecification findMerges(MergeTrigger mergeTrigger,
                                                 SegmentInfos segmentInfos,
                                                 MergePolicy.MergeContext mergeContext)
                                          throws java.io.IOException

Description copied from class: MergePolicy

Determine what set of merge operations are now necessary on the index. IndexWriter calls this whenever there is a change to the segments. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Overrides:

findMerges in class FilterMergePolicy

Parameters:

mergeTrigger - the event that triggered the merge

segmentInfos - the total set of segments in the index

mergeContext - the IndexWriter to find the merges on

Throws:

java.io.IOException