org.elasticsearch.index.merge.EnableMergeScheduler Maven / Gradle / Ivy
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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.merge;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.MergeScheduler;
import org.apache.lucene.index.MergeTrigger;
import java.io.IOException;
/**
* A wrapper of another {@link org.apache.lucene.index.MergeScheduler} that allows
* to explicitly enable merge and disable on a thread local basis. The default is
* to have merges disabled.
*
* This merge scheduler can be used to get around the fact that even though a merge
* policy can control that no new merges will be created as a result of a segment flush
* (during indexing operation for example), the {@link #merge(org.apache.lucene.index.IndexWriter, org.apache.lucene.index.MergeTrigger, boolean)}
* call will still be called, and can result in stalling indexing.
*/
public class EnableMergeScheduler extends MergeScheduler {
private final MergeScheduler mergeScheduler;
public EnableMergeScheduler(MergeScheduler mergeScheduler) {
this.mergeScheduler = mergeScheduler;
}
@Override
public void merge(IndexWriter writer, MergeTrigger trigger, boolean newMergesFound) throws IOException {
if (trigger == MergeTrigger.EXPLICIT) {
mergeScheduler.merge(writer, trigger, newMergesFound);
}
}
@Override
public void close() throws IOException {
mergeScheduler.close();
}
@Override
public MergeScheduler clone() {
// Lucene IW makes a clone internally but since we hold on to this instance
// the clone will just be the identity.
return this;
}
@Override
public String toString() {
return "EnableMergeScheduler(" + mergeScheduler + ")";
}
}