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.handler;
21  
22  import java.io.IOException;
23  import java.util.List;
24  
25  import org.apache.hadoop.hbase.HRegionInfo;
26  import org.apache.hadoop.hbase.HTableDescriptor;
27  import org.apache.hadoop.hbase.InvalidFamilyOperationException;
28  import org.apache.hadoop.hbase.Server;
29  import org.apache.hadoop.hbase.catalog.MetaEditor;
30  import org.apache.hadoop.hbase.master.MasterFileSystem;
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 TableDeleteFamilyHandler extends TableEventHandler {
38  
39    private final byte [] familyName;
40  
41    public TableDeleteFamilyHandler(byte[] tableName, byte [] familyName,
42        Server server, final MasterServices masterServices) throws IOException {
43      super(EventType.C_M_ADD_FAMILY, tableName, server, masterServices);
44      this.familyName = familyName;
45    }
46  
47    @Override
48    protected void handleTableOperation(List<HRegionInfo> hris) throws IOException {
49      HTableDescriptor htd = hris.get(0).getTableDesc();
50      if(!htd.hasFamily(familyName)) {
51        throw new InvalidFamilyOperationException(
52            "Family '" + Bytes.toString(familyName) + "' does not exist so " +
53            "cannot be deleted");
54      }
55      for (HRegionInfo hri : hris) {
56        // Update the HTD
57        hri.getTableDesc().removeFamily(familyName);
58        // Update region in META
59        MetaEditor.updateRegionInfo(this.server.getCatalogTracker(), hri);
60        MasterFileSystem mfs = this.masterServices.getMasterFileSystem();
61        // Update region info in FS
62        mfs.updateRegionInfo(hri);
63        // Delete directory in FS
64        mfs.deleteFamily(hri, familyName);
65        // Update region info in FS
66        this.masterServices.getMasterFileSystem().updateRegionInfo(hri);
67      }
68    }
69  }