Package org.elasticsearch.index.shard

Class ElasticsearchMergePolicy

java.lang.Object

org.apache.lucene.index.MergePolicy

org.apache.lucene.index.MergePolicyWrapper

org.elasticsearch.index.shard.ElasticsearchMergePolicy

public final class ElasticsearchMergePolicy
extends org.apache.lucene.index.MergePolicyWrapper

A MergePolicy that upgrades segments and can upgrade merges.

It can be useful to use the background merging process to upgrade segments, for example when we perform internal changes that imply different index options or when a user modifies his mapping in non-breaking ways: we could imagine using this merge policy to be able to add doc values to fields after the fact or on the opposite to remove them.

For now, this MergePolicy takes care of moving versions that used to be stored as payloads to numeric doc values.

Nested Class Summary

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

org.apache.lucene.index.MergePolicy.MergeAbortedException, org.apache.lucene.index.MergePolicy.MergeException, org.apache.lucene.index.MergePolicy.MergeSpecification, org.apache.lucene.index.MergePolicy.OneMerge, org.apache.lucene.index.MergePolicy.OneMergeProgress

Field Summary

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

DEFAULT_MAX_CFS_SEGMENT_SIZE, DEFAULT_NO_CFS_RATIO, maxCFSSegmentSize, noCFSRatio

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

in

Constructor Summary

Constructors

Constructor	Description
ElasticsearchMergePolicy(org.apache.lucene.index.MergePolicy delegate)

Method Summary

Modifier and Type	Method	Description
org.apache.lucene.index.MergePolicy.MergeSpecification	findForcedMerges(org.apache.lucene.index.SegmentInfos segmentInfos, int maxSegmentCount, java.util.Map<org.apache.lucene.index.SegmentCommitInfo,java.lang.Boolean> segmentsToMerge, org.apache.lucene.index.IndexWriter writer)
void	setUpgradeInProgress(boolean upgrade, boolean onlyAncientSegments)	When upgrade is true, running a force merge will upgrade any segments written with older versions.

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

getMaxCFSSegmentSizeMB, isMerged

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

findForcedDeletesMerges, findMerges, getNoCFSRatio, setMaxCFSSegmentSizeMB, setNoCFSRatio, size, toString, useCompoundFile

Methods inherited from class java.lang.Object

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

Constructor Detail

ElasticsearchMergePolicy

public ElasticsearchMergePolicy(org.apache.lucene.index.MergePolicy delegate)

Parameters:

delegate - the merge policy to wrap

Method Detail

findForcedMerges

public org.apache.lucene.index.MergePolicy.MergeSpecification findForcedMerges(org.apache.lucene.index.SegmentInfos segmentInfos,
                                                                               int maxSegmentCount,
                                                                               java.util.Map<org.apache.lucene.index.SegmentCommitInfo,java.lang.Boolean> segmentsToMerge,
                                                                               org.apache.lucene.index.IndexWriter writer)
                                                                        throws java.io.IOException

Overrides:

findForcedMerges in class org.apache.lucene.index.MergePolicyWrapper

Throws:

java.io.IOException

setUpgradeInProgress

public void setUpgradeInProgress(boolean upgrade,
                                 boolean onlyAncientSegments)

When upgrade is true, running a force merge will upgrade any segments written with older versions. This will apply to the next call to IndexWriter.forceMerge(int) that is handled by this MergePolicy, as well as cascading calls made by IndexWriter.