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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.catalog.MetaEditor;
31  import org.apache.hadoop.hbase.master.MasterServices;
32  import org.apache.hadoop.hbase.util.Bytes;
33  
34  /**
35   * Handles adding a new family to an existing table.
36   */
37  public class TableModifyFamilyHandler extends TableEventHandler {
38  
39    private final HColumnDescriptor familyDesc;
40  
41    public TableModifyFamilyHandler(byte[] tableName,
42        HColumnDescriptor familyDesc, Server server,
43        final MasterServices masterServices) throws IOException {
44      super(EventType.C_M_MODIFY_FAMILY, tableName, server, masterServices);
45      this.familyDesc = familyDesc;
46    }
47  
48    @Override
49    protected void handleTableOperation(List<HRegionInfo> regions) throws IOException {
50      HTableDescriptor htd = regions.get(0).getTableDesc();
51      byte [] familyName = familyDesc.getName();
52      if(!htd.hasFamily(familyName)) {
53        throw new InvalidFamilyOperationException("Family '" +
54          Bytes.toString(familyName) + "' doesn't exists so cannot be modified");
55      }
56      for(HRegionInfo hri : regions) {
57        // Update the HTD
58        hri.getTableDesc().addFamily(familyDesc);
59        // Update region in META
60        MetaEditor.updateRegionInfo(this.server.getCatalogTracker(), hri);
61        // Update region info in FS
62        this.masterServices.getMasterFileSystem().updateRegionInfo(hri);
63      }
64    }
65  }