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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.apache.hadoop.hdfs.server.datanode;
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+
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+import org.apache.hadoop.fs.Path;
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+import org.apache.hadoop.hdfs.DFSTestUtil;
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+import org.apache.hadoop.hdfs.DistributedFileSystem;
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+import org.apache.hadoop.hdfs.HdfsConfiguration;
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+import org.apache.hadoop.hdfs.MiniDFSCluster;
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+import org.junit.Assert;
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+import org.junit.Test;
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+
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+import static org.apache.hadoop.util.Time.monotonicNow;
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_DATA_READ_BANDWIDTHPERSEC_KEY;
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+import static org.junit.Assert.assertTrue;
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+
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+/**
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+ * Tests throttle the data transfers related functions.
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+ */
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+public class TestDataTransferThrottler {
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+
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+ /**
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+ * Test read data transfer throttler.
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+ */
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+ @Test
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+ public void testReadDataTransferThrottler() throws Exception {
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+ final HdfsConfiguration conf = new HdfsConfiguration();
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+
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+ try (MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build()) {
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+ cluster.waitActive();
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+ final DistributedFileSystem fs = cluster.getFileSystem();
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+
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+ // Create file.
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+ Path file = new Path("/test");
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+ long fileLength = 1024 * 1024 * 10 * 8;
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+ DFSTestUtil.createFile(fs, file, fileLength, (short) 1, 0L);
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+ DFSTestUtil.waitReplication(fs, file, (short) 1);
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+
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+ DataNode dataNode = cluster.getDataNodes().get(0);
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+ // DataXceiverServer#readThrottler is null if
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+ // dfs.datanode.data.read.bandwidthPerSec default value is 0.
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+ Assert.assertNull(dataNode.xserver.getReadThrottler());
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+
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+ // Read file.
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+ Assert.assertEquals(fileLength, DFSTestUtil.readFileAsBytes(fs, file).length);
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+
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+ // Set dfs.datanode.data.read.bandwidthPerSec.
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+ long bandwidthPerSec = 1024 * 1024 * 8;
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+ conf.setLong(DFS_DATANODE_DATA_READ_BANDWIDTHPERSEC_KEY, bandwidthPerSec);
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+
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+ // Restart the first datanode.
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+ cluster.stopDataNode(0);
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+ cluster.startDataNodes(conf, 1, true, null, null);
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+ dataNode = cluster.getDataNodes().get(0);
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+ Assert.assertEquals(bandwidthPerSec, dataNode.xserver.getReadThrottler().getBandwidth());
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+
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+ // Read file with throttler.
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+ long start = monotonicNow();
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+ Assert.assertEquals(fileLength, DFSTestUtil.readFileAsBytes(fs, file).length);
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+ long elapsedTime = monotonicNow() - start;
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+ // Ensure throttler is effective, read 1024 * 1024 * 10 * 8 bytes,
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+ // should take approximately 10 seconds (1024 * 1024 * 8 bytes per second).
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+ long expectedElapsedTime = fileLength / bandwidthPerSec * 1000; // in milliseconds.
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+ long acceptableError = 1000; // 1 milliseconds, allowing for a small margin of error.
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+ assertTrue(elapsedTime >= expectedElapsedTime - acceptableError);
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+ }
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+ }
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+}
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huhaiyang