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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;
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+
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+import org.apache.hadoop.conf.Configuration;
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+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
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+import org.apache.hadoop.test.GenericTestUtils;
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+import org.apache.log4j.Level;
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+
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+import org.junit.After;
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+import org.junit.Test;
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+
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+
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+import java.io.IOException;
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+import java.net.Socket;
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+
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_DEFAULT;
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+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_KEY;
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+import static org.junit.Assert.assertEquals;
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+import static org.junit.Assert.assertTrue;
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+
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+public class TestDFSClientSocketSize {
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+ private static final Logger LOG = LoggerFactory.getLogger(
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+ TestDFSClientSocketSize.class);
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+ static {
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+ GenericTestUtils.setLogLevel(DFSClient.LOG, Level.ALL);
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+ }
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+
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+ private final Configuration conf = new Configuration();
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+ private MiniDFSCluster cluster;
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+ private Socket socket;
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+
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+ @Test
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+ public void testDefaultSendBufferSize() throws IOException {
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+ socket = createSocket();
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+ assertEquals("Send buffer size should be the default value.",
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+ DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_DEFAULT,
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+ socket.getSendBufferSize());
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+ }
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+
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+ @Test
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+ public void testSpecifiedSendBufferSize() throws IOException {
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+ final int mySendBufferSize = 64 * 1024; // 64 KB
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+ conf.setInt(DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_KEY, mySendBufferSize);
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+ socket = createSocket();
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+ assertEquals("Send buffer size should be the customized value.",
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+ mySendBufferSize, socket.getSendBufferSize());
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+ }
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+
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+ @Test
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+ public void testAutoTuningSendBufferSize() throws IOException {
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+ conf.setInt(DFS_CLIENT_SOCKET_SEND_BUFFER_SIZE_KEY, 0);
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+ socket = createSocket();
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+ LOG.info("The auto tuned send buffer size is: {}",
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+ socket.getSendBufferSize());
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+ assertTrue("Send buffer size should be non-negative value which is " +
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+ "determined by system (kernel).", socket.getSendBufferSize() > 0);
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+ }
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+
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+ @After
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+ public void tearDown() throws Exception {
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+ if (socket != null) {
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+ LOG.info("Closing the DFSClient socket.");
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+ }
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+ if (cluster != null) {
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+ LOG.info("Shutting down MiniDFSCluster.");
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+ cluster.shutdown();
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+ }
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+ }
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+
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+ private Socket createSocket() throws IOException {
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+ cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
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+ cluster.waitActive();
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+ LOG.info("MiniDFSCluster started.");
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+ return DFSOutputStream.createSocketForPipeline(
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+ new DatanodeInfo(cluster.dataNodes.get(0).datanode.getDatanodeId()),
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+ 1, cluster.getFileSystem().getClient());
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+ }
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+}
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Zhe Zhang