001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.hbase.chaos.actions;
020
021import java.io.IOException;
022import java.util.Random;
023import org.apache.hadoop.hbase.TableName;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * Action that changes the number of versions on a column family from a list of tables.
029 *
030 * Always keeps at least 1 as the number of versions.
031 */
032public class ChangeVersionsAction extends Action {
033  private static final Logger LOG = LoggerFactory.getLogger(ChangeVersionsAction.class);
034  private final TableName tableName;
035
036  private final Random random;
037
038  public ChangeVersionsAction(TableName tableName) {
039    this.tableName = tableName;
040    this.random = new Random();
041  }
042
043  @Override protected Logger getLogger() {
044    return LOG;
045  }
046
047  @Override
048  public void perform() throws IOException {
049    final int versions =  random.nextInt(3) + 1;
050
051    getLogger().debug("Performing action: Changing versions on " + tableName + " to " + versions);
052    modifyAllTableColumns(tableName, columnBuilder -> {
053      columnBuilder.setMinVersions(versions).setMaxVersions(versions);
054    });
055    getLogger().debug("Performing action: Just changed versions on " + tableName);
056  }
057}