View Javadoc

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.fs.Path;
23  import org.apache.hadoop.hbase.HRegionInfo;
24  import org.apache.hadoop.hbase.ipc.HRegionInterface;
25  import org.apache.hadoop.hbase.regionserver.Store;
26  
27  import java.io.IOException;
28  
29  /** Instantiated to remove a column family from a table */
30  class DeleteColumn extends ColumnOperation {
31    private final byte [] columnName;
32  
33    DeleteColumn(final HMaster master, final byte [] tableName,
34      final byte [] columnName)
35    throws IOException {
36      super(master, tableName);
37      this.columnName = columnName;
38    }
39  
40    @Override
41    protected void postProcessMeta(MetaRegion m, HRegionInterface server)
42    throws IOException {
43      for (HRegionInfo i: unservedRegions) {
44        i.getTableDesc().removeFamily(columnName);
45        updateRegionInfo(server, m.getRegionName(), i);
46        // Delete the directories used by the column
47        Path tabledir =
48          new Path(this.master.getRootDir(), i.getTableDesc().getNameAsString());
49        this.master.getFileSystem().
50          delete(Store.getStoreHomedir(tabledir, i.getEncodedName(),
51          this.columnName), true);
52      }
53    }
54  }