org.elasticsearch.index.deletionpolicy.KeepOnlyLastDeletionPolicy Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* 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.deletionpolicy;
import org.apache.lucene.index.IndexCommit;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.settings.IndexSettingsService;
import org.elasticsearch.index.shard.ShardId;
import java.util.List;
/**
* This {@link org.apache.lucene.index.IndexDeletionPolicy} implementation that
* keeps only the most recent commit and immediately removes
* all prior commits after a new commit is done. This is
* the default deletion policy.
*/
public class KeepOnlyLastDeletionPolicy extends AbstractESDeletionPolicy {
@Inject
public KeepOnlyLastDeletionPolicy(ShardId shardId, IndexSettingsService indexSettingsService) {
this(shardId, indexSettingsService.getSettings());
}
public KeepOnlyLastDeletionPolicy(ShardId shardId, Settings indexSettings) {
super(shardId, indexSettings);
logger.debug("Using [keep_only_last] deletion policy");
}
/**
* Deletes all commits except the most recent one.
*/
@Override
public void onInit(List commits) {
// Note that commits.size() should normally be 1:
onCommit(commits);
}
/**
* Deletes all commits except the most recent one.
*/
@Override
public void onCommit(List commits) {
// Note that commits.size() should normally be 2 (if not
// called by onInit above):
int size = commits.size();
for (int i = 0; i < size - 1; i++) {
commits.get(i).delete();
}
}
}