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.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028/**
029 * Action that changes the encoding on a column family from a list of tables.
030 */
031public class ChangeEncodingAction extends Action {
032  private final TableName tableName;
033  private final Random random;
034  private static final Logger LOG = LoggerFactory.getLogger(ChangeEncodingAction.class);
035
036  public ChangeEncodingAction(TableName tableName) {
037    this.tableName = tableName;
038    this.random = new Random();
039  }
040
041  @Override protected Logger getLogger() {
042    return LOG;
043  }
044
045  @Override
046  public void perform() throws IOException {
047    getLogger().debug("Performing action: Changing encodings on " + tableName);
048    // possible DataBlockEncoding id's
049    final int[] possibleIds = {0, 2, 3, 4, 7};
050
051    modifyAllTableColumns(tableName, (columnName, columnBuilder) -> {
052      short id = (short) possibleIds[random.nextInt(possibleIds.length)];
053      DataBlockEncoding encoding = DataBlockEncoding.getEncodingById(id);
054      columnBuilder.setDataBlockEncoding(encoding);
055      getLogger().debug("Set encoding of column family " + columnName + " to: " + encoding);
056    });
057  }
058}