View Javadoc

1   /**
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.master.handler;
21  
22  import java.io.IOException;
23  import java.util.List;
24  
25  import org.apache.hadoop.hbase.HRegionInfo;
26  import org.apache.hadoop.hbase.HTableDescriptor;
27  import org.apache.hadoop.hbase.Server;
28  import org.apache.hadoop.hbase.master.MasterServices;
29  import org.apache.hadoop.hbase.master.MasterFileSystem;
30  import org.apache.hadoop.hbase.util.Bytes;
31  
32  /**
33   * Handles adding a new family to an existing table.
34   */
35  public class TableDeleteFamilyHandler extends TableEventHandler {
36  
37    private final byte [] familyName;
38  
39    public TableDeleteFamilyHandler(byte[] tableName, byte [] familyName,
40        Server server, final MasterServices masterServices) throws IOException {
41      super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
42      HTableDescriptor htd = getTableDescriptor();
43      this.familyName = hasColumnFamily(htd, familyName);
44    }
45  
46    @Override
47    protected void handleTableOperation(List<HRegionInfo> hris) throws IOException {
48      MasterFileSystem mfs = this.masterServices.getMasterFileSystem();
49      // Update table descriptor
50      mfs.deleteColumn(tableName, familyName);
51      // Remove the column family from the file system
52      for (HRegionInfo hri : hris) {
53        // Delete the family directory in FS for all the regions one by one
54        mfs.deleteFamilyFromFS(hri, familyName);
55      }
56    }
57  
58    @Override
59    public String toString() {
60      String name = "UnknownServerName";
61      if(server != null && server.getServerName() != null) {
62        name = server.getServerName().toString();
63      }
64      String family = "UnknownFamily";
65      if(familyName != null) {
66        family = Bytes.toString(familyName);
67      }
68      return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-" + tableNameStr + "-" + family;
69    }
70  }