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 }