| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hdfs; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import java.util.ArrayList; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.server.datanode.DataNode; |
| import org.junit.Test; |
| |
| /** |
| * This test ensures that the balancer bandwidth is dynamically adjusted |
| * correctly. |
| */ |
| public class TestBalancerBandwidth { |
| final static private Configuration conf = new Configuration(); |
| final static private int NUM_OF_DATANODES = 2; |
| final static private int DEFAULT_BANDWIDTH = 1024*1024; |
| public static final Log LOG = LogFactory.getLog(TestBalancerBandwidth.class); |
| |
| @Test |
| public void testBalancerBandwidth() throws Exception { |
| /* Set bandwidthPerSec to a low value of 1M bps. */ |
| conf.setLong( |
| DFSConfigKeys.DFS_DATANODE_BALANCE_BANDWIDTHPERSEC_KEY, |
| DEFAULT_BANDWIDTH); |
| |
| /* Create and start cluster */ |
| MiniDFSCluster cluster = |
| new MiniDFSCluster.Builder(conf).numDataNodes(NUM_OF_DATANODES).build(); |
| try { |
| cluster.waitActive(); |
| |
| DistributedFileSystem fs = (DistributedFileSystem) cluster.getFileSystem(); |
| |
| ArrayList<DataNode> datanodes = cluster.getDataNodes(); |
| // Ensure value from the configuration is reflected in the datanodes. |
| assertEquals(DEFAULT_BANDWIDTH, (long) datanodes.get(0).getBalancerBandwidth()); |
| assertEquals(DEFAULT_BANDWIDTH, (long) datanodes.get(1).getBalancerBandwidth()); |
| |
| // Dynamically change balancer bandwidth and ensure the updated value |
| // is reflected on the datanodes. |
| long newBandwidth = 12 * DEFAULT_BANDWIDTH; // 12M bps |
| fs.setBalancerBandwidth(newBandwidth); |
| |
| // Give it a few seconds to propogate new the value to the datanodes. |
| try { |
| Thread.sleep(5000); |
| } catch (Exception e) {} |
| |
| assertEquals(newBandwidth, (long) datanodes.get(0).getBalancerBandwidth()); |
| assertEquals(newBandwidth, (long) datanodes.get(1).getBalancerBandwidth()); |
| |
| // Dynamically change balancer bandwidth to 0. Balancer bandwidth on the |
| // datanodes should remain as it was. |
| fs.setBalancerBandwidth(0); |
| |
| // Give it a few seconds to propogate new the value to the datanodes. |
| try { |
| Thread.sleep(5000); |
| } catch (Exception e) {} |
| |
| assertEquals(newBandwidth, (long) datanodes.get(0).getBalancerBandwidth()); |
| assertEquals(newBandwidth, (long) datanodes.get(1).getBalancerBandwidth()); |
| }finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| new TestBalancerBandwidth().testBalancerBandwidth(); |
| } |
| } |