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;
023
024import org.apache.hadoop.hbase.TableName;
025import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * Action that changes the encoding on a column family from a list of tables.
031 */
032public class ChangeEncodingAction extends Action {
033  private final TableName tableName;
034  private final Random random;
035  private static final Logger LOG = LoggerFactory.getLogger(ChangeEncodingAction.class);
036
037  public ChangeEncodingAction(TableName tableName) {
038    this.tableName = tableName;
039    this.random = new Random();
040  }
041
042  @Override
043  public void perform() throws IOException {
044    LOG.debug("Performing action: Changing encodings on " + tableName);
045    // possible DataBlockEncoding id's
046    final int[] possibleIds = {0, 2, 3, 4, 6};
047
048    modifyAllTableColumns(tableName, (columnName, columnBuilder) -> {
049      short id = (short) possibleIds[random.nextInt(possibleIds.length)];
050      DataBlockEncoding encoding = DataBlockEncoding.getEncodingById(id);
051      columnBuilder.setDataBlockEncoding(encoding);
052      LOG.debug("Set encoding of column family " + columnName + " to: " + encoding);
053    });
054  }
055}