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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.util.Bytes;
30  
31  /**
32   * Handles adding a new family to an existing table.
33   */
34  public class TableDeleteFamilyHandler extends TableEventHandler {
35  
36    private final byte [] familyName;
37  
38    public TableDeleteFamilyHandler(byte[] tableName, byte [] familyName,
39        Server server, final MasterServices masterServices) throws IOException {
40      super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
41      HTableDescriptor htd = getTableDescriptor();
42      this.familyName = hasColumnFamily(htd, familyName);
43    }
44  
45    @Override
46    protected void handleTableOperation(List<HRegionInfo> hris) throws IOException {
47      // Update table descriptor in HDFS
48      HTableDescriptor htd =
49        this.masterServices.getMasterFileSystem().deleteColumn(tableName, familyName);
50      // Update in-memory descriptor cache
51      this.masterServices.getTableDescriptors().add(htd);
52    }
53  
54    @Override
55    public String toString() {
56      String name = "UnknownServerName";
57      if(server != null && server.getServerName() != null) {
58        name = server.getServerName().toString();
59      }
60      String family = "UnknownFamily";
61      if(familyName != null) {
62        family = Bytes.toString(familyName);
63      }
64      return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-" + tableNameStr + "-" + family;
65    }
66  }