1 | /** |
---|
2 | * Licensed to the Apache Software Foundation (ASF) under one |
---|
3 | * or more contributor license agreements. See the NOTICE file |
---|
4 | * distributed with this work for additional information |
---|
5 | * regarding copyright ownership. The ASF licenses this file |
---|
6 | * to you under the Apache License, Version 2.0 (the |
---|
7 | * "License"); you may not use this file except in compliance |
---|
8 | * with the License. You may obtain a copy of the License at |
---|
9 | * |
---|
10 | * http://www.apache.org/licenses/LICENSE-2.0 |
---|
11 | * |
---|
12 | * Unless required by applicable law or agreed to in writing, software |
---|
13 | * distributed under the License is distributed on an "AS IS" BASIS, |
---|
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
15 | * See the License for the specific language governing permissions and |
---|
16 | * limitations under the License. |
---|
17 | */ |
---|
18 | package org.apache.hadoop.hdfs; |
---|
19 | |
---|
20 | import java.io.IOException; |
---|
21 | import java.util.ArrayList; |
---|
22 | |
---|
23 | import org.apache.hadoop.conf.Configuration; |
---|
24 | import org.apache.hadoop.hdfs.DFSClient.DFSOutputStream; |
---|
25 | import org.apache.hadoop.hdfs.server.namenode.DatanodeDescriptor; |
---|
26 | import org.apache.hadoop.fs.FSDataOutputStream; |
---|
27 | import org.apache.hadoop.fs.FileSystem; |
---|
28 | import org.apache.hadoop.fs.Path; |
---|
29 | |
---|
30 | import junit.framework.TestCase; |
---|
31 | |
---|
32 | /** |
---|
33 | * This class tests DatanodeDescriptor.getBlocksScheduled() at the |
---|
34 | * NameNode. This counter is supposed to keep track of blocks currently |
---|
35 | * scheduled to a datanode. |
---|
36 | */ |
---|
37 | public class TestBlocksScheduledCounter extends TestCase { |
---|
38 | |
---|
39 | public void testBlocksScheduledCounter() throws IOException { |
---|
40 | |
---|
41 | MiniDFSCluster cluster = new MiniDFSCluster(new Configuration(), 1, |
---|
42 | true, null); |
---|
43 | cluster.waitActive(); |
---|
44 | FileSystem fs = cluster.getFileSystem(); |
---|
45 | |
---|
46 | //open a file an write a few bytes: |
---|
47 | FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter")); |
---|
48 | for (int i=0; i<1024; i++) { |
---|
49 | out.write(i); |
---|
50 | } |
---|
51 | // flush to make sure a block is allocated. |
---|
52 | ((DFSOutputStream)(out.getWrappedStream())).sync(); |
---|
53 | |
---|
54 | ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>(); |
---|
55 | cluster.getNameNode().namesystem.DFSNodesStatus(dnList, dnList); |
---|
56 | DatanodeDescriptor dn = dnList.get(0); |
---|
57 | |
---|
58 | assertEquals(1, dn.getBlocksScheduled()); |
---|
59 | |
---|
60 | // close the file and the counter should go to zero. |
---|
61 | out.close(); |
---|
62 | assertEquals(0, dn.getBlocksScheduled()); |
---|
63 | } |
---|
64 | } |
---|