[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.hdfs; |
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| 19 | |
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| 20 | import java.io.IOException; |
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| 21 | import java.util.ArrayList; |
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| 22 | |
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| 23 | import org.apache.hadoop.conf.Configuration; |
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| 24 | import org.apache.hadoop.hdfs.DFSClient.DFSOutputStream; |
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| 25 | import org.apache.hadoop.hdfs.server.namenode.DatanodeDescriptor; |
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| 26 | import org.apache.hadoop.fs.FSDataOutputStream; |
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| 27 | import org.apache.hadoop.fs.FileSystem; |
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| 28 | import org.apache.hadoop.fs.Path; |
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| 29 | |
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| 30 | import junit.framework.TestCase; |
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| 31 | |
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| 32 | /** |
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| 33 | * This class tests DatanodeDescriptor.getBlocksScheduled() at the |
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| 34 | * NameNode. This counter is supposed to keep track of blocks currently |
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| 35 | * scheduled to a datanode. |
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| 36 | */ |
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| 37 | public class TestBlocksScheduledCounter extends TestCase { |
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| 38 | |
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| 39 | public void testBlocksScheduledCounter() throws IOException { |
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| 40 | |
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| 41 | MiniDFSCluster cluster = new MiniDFSCluster(new Configuration(), 1, |
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| 42 | true, null); |
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| 43 | cluster.waitActive(); |
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| 44 | FileSystem fs = cluster.getFileSystem(); |
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| 45 | |
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| 46 | //open a file an write a few bytes: |
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| 47 | FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter")); |
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| 48 | for (int i=0; i<1024; i++) { |
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| 49 | out.write(i); |
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| 50 | } |
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| 51 | // flush to make sure a block is allocated. |
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| 52 | ((DFSOutputStream)(out.getWrappedStream())).sync(); |
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| 53 | |
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| 54 | ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>(); |
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| 55 | cluster.getNameNode().namesystem.DFSNodesStatus(dnList, dnList); |
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| 56 | DatanodeDescriptor dn = dnList.get(0); |
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| 57 | |
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| 58 | assertEquals(1, dn.getBlocksScheduled()); |
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| 59 | |
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| 60 | // close the file and the counter should go to zero. |
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| 61 | out.close(); |
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| 62 | assertEquals(0, dn.getBlocksScheduled()); |
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| 63 | } |
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| 64 | } |
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