org.elasticsearch.index.deletionpolicy.KeepLastNDeletionPolicy Maven / Gradle / Ivy
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* 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.apache.lucene.index.IndexDeletionPolicy;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.ShardId;
import java.io.IOException;
import java.util.List;
/**
*
*/
public class KeepLastNDeletionPolicy extends AbstractESDeletionPolicy {
private final int numToKeep;
@Inject
public KeepLastNDeletionPolicy(ShardId shardId, @IndexSettings Settings indexSettings) {
super(shardId, indexSettings);
this.numToKeep = componentSettings.getAsInt("num_to_keep", 5);
logger.debug("Using [keep_last_n] deletion policy with num_to_keep[{}]", numToKeep);
}
public void onInit(List commits) throws IOException {
// do no deletions on init
doDeletes(commits);
}
public void onCommit(List commits) throws IOException {
doDeletes(commits);
}
private void doDeletes(List commits) {
int size = commits.size();
for (int i = 0; i < size - numToKeep; i++) {
commits.get(i).delete();
}
}
}