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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.util.Random;
22  
23  import org.apache.hadoop.hbase.HBaseTestingUtility;
24  import org.apache.hadoop.hbase.client.Admin;
25  import org.apache.hadoop.hbase.client.HBaseAdmin;
26  import org.apache.hadoop.hbase.TableName;
27  
28  /**
29   * Action that tries to truncate of a table.
30   */
31  public class TruncateTableAction extends Action {
32    private final TableName tableName;
33    private final Random random;
34  
35    public TruncateTableAction(String tableName) {
36      this.tableName = TableName.valueOf(tableName);
37      this.random = new Random();
38    }
39  
40    @Override
41    public void perform() throws Exception {
42      HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
43      Admin admin = util.getHBaseAdmin();
44  
45      // Don't try the truncate if we're stopping
46      if (context.isStopping()) {
47        return;
48      }
49  
50      boolean preserveSplits = random.nextBoolean();
51      LOG.info("Performing action: Truncate table " + tableName.getNameAsString() +
52               "preserve splits " + preserveSplits);
53      admin.truncateTable(tableName, preserveSplits);
54    }
55  }