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;
21
22 import org.apache.hadoop.hbase.HColumnDescriptor;
23 import org.apache.hadoop.hbase.HRegionInfo;
24 import org.apache.hadoop.hbase.ipc.HRegionInterface;
25
26 import java.io.IOException;
27
28 /** Instantiated to add a column family to a table */
29 class AddColumn extends ColumnOperation {
30 private final HColumnDescriptor newColumn;
31
32 AddColumn(final HMaster master, final byte [] tableName,
33 final HColumnDescriptor newColumn)
34 throws IOException {
35 super(master, tableName);
36 this.newColumn = newColumn;
37 }
38
39 @Override
40 protected void postProcessMeta(MetaRegion m, HRegionInterface server)
41 throws IOException {
42 for (HRegionInfo i: unservedRegions) {
43 // All we need to do to add a column is add it to the table descriptor.
44 // When the region is brought on-line, it will find the column missing
45 // and create it.
46 i.getTableDesc().addFamily(newColumn);
47 updateRegionInfo(server, m.getRegionName(), i);
48 }
49 }
50 }