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 java.util.Set;
024import org.apache.hadoop.hbase.TableName;
025import org.apache.hadoop.hbase.client.Admin;
026import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
027import org.apache.hadoop.hbase.client.TableDescriptor;
028import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
029import org.apache.hadoop.hbase.util.Bytes;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033/**
034 * Action that removes a column family.
035 */
036public class RemoveColumnAction extends Action {
037  private static final Logger LOG =
038      LoggerFactory.getLogger(RemoveColumnAction.class);
039  private final TableName tableName;
040  private final Set<String> protectedColumns;
041  private Admin admin;
042  private final Random random;
043
044  public RemoveColumnAction(TableName tableName, Set<String> protectedColumns) {
045    this.tableName = tableName;
046    this.protectedColumns = protectedColumns;
047    random = new Random();
048  }
049
050  @Override protected Logger getLogger() {
051    return LOG;
052  }
053
054  @Override
055  public void init(ActionContext context) throws IOException {
056    super.init(context);
057    this.admin = context.getHBaseIntegrationTestingUtility().getAdmin();
058  }
059
060  @Override
061  public void perform() throws Exception {
062    TableDescriptor tableDescriptor = admin.getDescriptor(tableName);
063    ColumnFamilyDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
064
065    if (columnDescriptors.length <= (protectedColumns == null ? 1 : protectedColumns.size())) {
066      return;
067    }
068
069    int index = random.nextInt(columnDescriptors.length);
070    while(protectedColumns != null &&
071          protectedColumns.contains(columnDescriptors[index].getNameAsString())) {
072      index = random.nextInt(columnDescriptors.length);
073    }
074    byte[] colDescName = columnDescriptors[index].getName();
075    getLogger().debug("Performing action: Removing " + Bytes.toString(colDescName)+ " from "
076        + tableName.getNameAsString());
077
078    TableDescriptorBuilder builder = TableDescriptorBuilder.newBuilder(tableDescriptor);
079    builder.removeColumnFamily(colDescName);
080
081    // Don't try the modify if we're stopping
082    if (context.isStopping()) {
083      return;
084    }
085    admin.modifyTable(builder.build());
086  }
087}