| /** |
| * 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.io.IOException; |
| import java.net.InetSocketAddress; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys; |
| import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * This class tests the client connection caching in a single node |
| * mini-cluster. |
| */ |
| public class TestConnCache { |
| static final Log LOG = LogFactory.getLog(TestConnCache.class); |
| |
| static final int BLOCK_SIZE = 4096; |
| static final int FILE_SIZE = 3 * BLOCK_SIZE; |
| |
| /** |
| * (Optionally) seek to position, read and verify data. |
| * |
| * Seek to specified position if pos is non-negative. |
| */ |
| private void pread(DFSInputStream in, |
| long pos, |
| byte[] buffer, |
| int offset, |
| int length, |
| byte[] authenticData) |
| throws IOException { |
| Assert.assertTrue("Test buffer too small", buffer.length >= offset + length); |
| |
| if (pos >= 0) |
| in.seek(pos); |
| |
| LOG.info("Reading from file of size " + in.getFileLength() + |
| " at offset " + in.getPos()); |
| |
| while (length > 0) { |
| int cnt = in.read(buffer, offset, length); |
| Assert.assertTrue("Error in read", cnt > 0); |
| offset += cnt; |
| length -= cnt; |
| } |
| |
| // Verify |
| for (int i = 0; i < length; ++i) { |
| byte actual = buffer[i]; |
| byte expect = authenticData[(int)pos + i]; |
| assertEquals("Read data mismatch at file offset " + (pos + i) + |
| ". Expects " + expect + "; got " + actual, |
| actual, expect); |
| } |
| } |
| |
| /** |
| * Read a file served entirely from one DN. Seek around and read from |
| * different offsets. And verify that they all use the same socket. |
| * @throws Exception |
| */ |
| @Test |
| public void testReadFromOneDN() throws Exception { |
| HdfsConfiguration configuration = new HdfsConfiguration(); |
| // One of the goals of this test is to verify that we don't open more |
| // than one socket. So use a different client context, so that we |
| // get our own socket cache, rather than sharing with the other test |
| // instances. Also use a really long socket timeout so that nothing |
| // gets closed before we get around to checking the cache size at the end. |
| final String contextName = "testReadFromOneDNContext"; |
| configuration.set(HdfsClientConfigKeys.DFS_CLIENT_CONTEXT, contextName); |
| configuration.setLong(HdfsClientConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY, |
| 100000000L); |
| BlockReaderTestUtil util = new BlockReaderTestUtil(1, configuration); |
| final Path testFile = new Path("/testConnCache.dat"); |
| byte authenticData[] = util.writeFile(testFile, FILE_SIZE / 1024); |
| DFSClient client = new DFSClient( |
| new InetSocketAddress("localhost", |
| util.getCluster().getNameNodePort()), util.getConf()); |
| DFSInputStream in = client.open(testFile.toString()); |
| LOG.info("opened " + testFile.toString()); |
| byte[] dataBuf = new byte[BLOCK_SIZE]; |
| |
| // Initial read |
| pread(in, 0, dataBuf, 0, dataBuf.length, authenticData); |
| // Read again and verify that the socket is the same |
| pread(in, FILE_SIZE - dataBuf.length, dataBuf, 0, dataBuf.length, |
| authenticData); |
| pread(in, 1024, dataBuf, 0, dataBuf.length, authenticData); |
| // No seek; just read |
| pread(in, -1, dataBuf, 0, dataBuf.length, authenticData); |
| pread(in, 64, dataBuf, 0, dataBuf.length / 2, authenticData); |
| |
| in.close(); |
| client.close(); |
| Assert.assertEquals(1, |
| ClientContext.getFromConf(configuration).getPeerCache().size()); |
| } |
| } |