1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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 import org.apache.hadoop.hbase.util.Bytes;
26
27 import java.io.IOException;
28
29
30 class ModifyColumn extends ColumnOperation {
31 private final HColumnDescriptor descriptor;
32 private final byte [] columnName;
33
34 ModifyColumn(final HMaster master, final byte [] tableName,
35 final byte [] columnName, HColumnDescriptor descriptor)
36 throws IOException {
37 super(master, tableName);
38 this.descriptor = descriptor;
39 this.columnName = columnName;
40 }
41
42 @Override
43 protected void postProcessMeta(MetaRegion m, HRegionInterface server)
44 throws IOException {
45 for (HRegionInfo i: unservedRegions) {
46 if (i.getTableDesc().hasFamily(columnName)) {
47 i.getTableDesc().addFamily(descriptor);
48 updateRegionInfo(server, m.getRegionName(), i);
49 } else {
50 throw new InvalidColumnNameException("Column family '" +
51 Bytes.toString(columnName) +
52 "' doesn't exist, so cannot be modified.");
53 }
54 }
55 }
56 }