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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 TableAddFamilyHandler extends TableEventHandler {
38  
39    private final HColumnDescriptor familyDesc;
40  
41    public TableAddFamilyHandler(byte[] tableName, HColumnDescriptor familyDesc,
42        Server server, final MasterServices masterServices) throws IOException {
43      super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
44      this.familyDesc = familyDesc;
45    }
46  
47    @Override
48    protected void handleTableOperation(List<HRegionInfo> hris)
49    throws IOException {
50      HTableDescriptor htd = hris.get(0).getTableDesc();
51      byte [] familyName = familyDesc.getName();
52      if(htd.hasFamily(familyName)) {
53        throw new InvalidFamilyOperationException(
54            "Family '" + Bytes.toString(familyName) + "' already exists so " +
55            "cannot be added");
56      }
57      for(HRegionInfo hri : hris) {
58        // Update the HTD
59        hri.getTableDesc().addFamily(familyDesc);
60        // Update region in META
61        MetaEditor.updateRegionInfo(this.server.getCatalogTracker(), hri);
62        // Update region info in FS
63        this.masterServices.getMasterFileSystem().updateRegionInfo(hri);
64      }
65    }
66  }