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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.HColumnDescriptor;
26  import org.apache.hadoop.hbase.HRegionInfo;
27  import org.apache.hadoop.hbase.HTableDescriptor;
28  import org.apache.hadoop.hbase.InvalidFamilyOperationException;
29  import org.apache.hadoop.hbase.Server;
30  import org.apache.hadoop.hbase.master.MasterServices;
31  import org.apache.hadoop.hbase.util.Bytes;
32  
33  /**
34   * Handles adding a new family to an existing table.
35   */
36  public class TableModifyFamilyHandler extends TableEventHandler {
37    private final HColumnDescriptor familyDesc;
38  
39    public TableModifyFamilyHandler(byte[] tableName,
40        HColumnDescriptor familyDesc, Server server,
41        final MasterServices masterServices) throws IOException {
42      super(EventType.C_M_MODIFY_FAMILY, tableName, server, masterServices);
43      HTableDescriptor htd = getTableDescriptor();
44      hasColumnFamily(htd, familyDesc.getName());
45      this.familyDesc = familyDesc;
46    }
47  
48    @Override
49    protected void handleTableOperation(List<HRegionInfo> regions) throws IOException {
50      // Update table descriptor in HDFS
51      HTableDescriptor htd =
52        this.masterServices.getMasterFileSystem().modifyColumn(tableName, familyDesc);
53      // Update in-memory descriptor cache
54      this.masterServices.getTableDescriptors().add(htd);
55    }
56  
57    @Override
58    public String toString() {
59      String name = "UnknownServerName";
60      if(server != null && server.getServerName() != null) {
61        name = server.getServerName().toString();
62      }
63      String family = "UnknownFamily";
64      if(familyDesc != null) {
65        family = familyDesc.getNameAsString();
66      }
67      return getClass().getSimpleName() + "-" + name + "-" + getSeqid() + "-" + tableNameStr + "-" + family;
68    }
69  
70  }