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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.chaos.actions;
20  
21  import java.io.IOException;
22  import java.util.Random;
23  import java.util.Set;
24  
25  import org.apache.hadoop.hbase.HColumnDescriptor;
26  import org.apache.hadoop.hbase.HTableDescriptor;
27  import org.apache.hadoop.hbase.TableName;
28  import org.apache.hadoop.hbase.client.Admin;
29  import org.apache.hadoop.hbase.util.Bytes;
30  
31  /**
32   * Action that removes a column family.
33   */
34  public class RemoveColumnAction extends Action {
35    private final TableName tableName;
36    private final Set<String> protectedColumns;
37    private Admin admin;
38    private Random random;
39  
40    public RemoveColumnAction(TableName tableName, Set<String> protectedColumns) {
41      this.tableName = tableName;
42      this.protectedColumns = protectedColumns;
43      random = new Random();
44    }
45  
46    @Override
47    public void init(ActionContext context) throws IOException {
48      super.init(context);
49      this.admin = context.getHBaseIntegrationTestingUtility().getHBaseAdmin();
50    }
51  
52    @Override
53    public void perform() throws Exception {
54      HTableDescriptor tableDescriptor = admin.getTableDescriptor(tableName);
55      HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
56  
57      if (columnDescriptors.length <= (protectedColumns == null ? 1 : protectedColumns.size())) {
58        return;
59      }
60  
61      int index = random.nextInt(columnDescriptors.length);
62      while(protectedColumns != null &&
63            protectedColumns.contains(columnDescriptors[index].getNameAsString())) {
64        index = random.nextInt(columnDescriptors.length);
65      }
66      byte[] colDescName = columnDescriptors[index].getName();
67      LOG.debug("Performing action: Removing " + Bytes.toString(colDescName)+ " from "
68          + tableName.getNameAsString());
69      tableDescriptor.removeFamily(colDescName);
70  
71      // Don't try the modify if we're stopping
72      if (context.isStopping()) {
73        return;
74      }
75      admin.modifyTable(tableName, tableDescriptor);
76    }
77  }