| /** |
| * 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 java.net.InetSocketAddress; |
| import java.net.Socket; |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.protocol.ExtendedBlock; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier; |
| import org.apache.hadoop.hdfs.server.datanode.DataNode; |
| |
| import org.apache.hadoop.security.token.Token; |
| import org.junit.Test; |
| import org.junit.AfterClass; |
| import org.junit.BeforeClass; |
| import static org.junit.Assert.*; |
| |
| import org.mockito.Matchers; |
| import org.mockito.Mockito; |
| import org.mockito.stubbing.Answer; |
| import org.mockito.invocation.InvocationOnMock; |
| import static org.mockito.Mockito.spy; |
| |
| /** |
| * 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; |
| |
| static Configuration conf = null; |
| static MiniDFSCluster cluster = null; |
| static FileSystem fs = null; |
| |
| static final Path testFile = new Path("/testConnCache.dat"); |
| static byte authenticData[] = null; |
| |
| static BlockReaderTestUtil util = null; |
| |
| |
| /** |
| * A mock Answer to remember the BlockReader used. |
| * |
| * It verifies that all invocation to DFSInputStream.getBlockReader() |
| * use the same socket. |
| */ |
| private class MockGetBlockReader implements Answer<BlockReader> { |
| public BlockReader reader = null; |
| private Socket sock = null; |
| |
| public BlockReader answer(InvocationOnMock invocation) throws Throwable { |
| BlockReader prevReader = reader; |
| reader = (BlockReader) invocation.callRealMethod(); |
| if (sock == null) { |
| sock = reader.dnSock; |
| } else if (prevReader != null && prevReader.hasSentStatusCode()) { |
| // Can't reuse socket if the previous BlockReader didn't read till EOS. |
| assertSame("DFSInputStream should use the same socket", |
| sock, reader.dnSock); |
| } return reader; |
| } |
| } |
| |
| @BeforeClass |
| public static void setupCluster() throws Exception { |
| final int REPLICATION_FACTOR = 1; |
| |
| util = new BlockReaderTestUtil(REPLICATION_FACTOR); |
| cluster = util.getCluster(); |
| conf = util.getConf(); |
| fs = cluster.getFileSystem(); |
| |
| authenticData = util.writeFile(testFile, FILE_SIZE / 1024); |
| } |
| |
| |
| /** |
| * (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) |
| throws IOException { |
| 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); |
| 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); |
| } |
| } |
| |
| /** |
| * Test the SocketCache itself. |
| */ |
| @Test |
| public void testSocketCache() throws IOException { |
| final int CACHE_SIZE = 4; |
| SocketCache cache = new SocketCache(CACHE_SIZE); |
| |
| // Make a client |
| InetSocketAddress nnAddr = |
| new InetSocketAddress("localhost", cluster.getNameNodePort()); |
| DFSClient client = new DFSClient(nnAddr, conf); |
| |
| // Find out the DN addr |
| LocatedBlock block = |
| client.getNamenode().getBlockLocations( |
| testFile.toString(), 0, FILE_SIZE) |
| .getLocatedBlocks().get(0); |
| DataNode dn = util.getDataNode(block); |
| InetSocketAddress dnAddr = dn.getSelfAddr(); |
| |
| // Make some sockets to the DN |
| Socket[] dnSockets = new Socket[CACHE_SIZE]; |
| for (int i = 0; i < dnSockets.length; ++i) { |
| dnSockets[i] = client.socketFactory.createSocket( |
| dnAddr.getAddress(), dnAddr.getPort()); |
| } |
| |
| // Insert a socket to the NN |
| Socket nnSock = new Socket(nnAddr.getAddress(), nnAddr.getPort()); |
| cache.put(nnSock); |
| assertSame("Read the write", nnSock, cache.get(nnAddr)); |
| cache.put(nnSock); |
| |
| // Insert DN socks |
| for (Socket dnSock : dnSockets) { |
| cache.put(dnSock); |
| } |
| |
| assertEquals("NN socket evicted", null, cache.get(nnAddr)); |
| assertTrue("Evicted socket closed", nnSock.isClosed()); |
| |
| // Lookup the DN socks |
| for (Socket dnSock : dnSockets) { |
| assertEquals("Retrieve cached sockets", dnSock, cache.get(dnAddr)); |
| dnSock.close(); |
| } |
| |
| assertEquals("Cache is empty", 0, cache.size()); |
| } |
| |
| /** |
| * 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 java.io.IOException |
| */ |
| @Test |
| @SuppressWarnings("unchecked") |
| public void testReadFromOneDN() throws IOException { |
| LOG.info("Starting testReadFromOneDN()"); |
| DFSClient client = new DFSClient( |
| new InetSocketAddress("localhost", cluster.getNameNodePort()), conf); |
| DFSInputStream in = spy(client.open(testFile.toString())); |
| LOG.info("opened " + testFile.toString()); |
| |
| byte[] dataBuf = new byte[BLOCK_SIZE]; |
| |
| MockGetBlockReader answer = new MockGetBlockReader(); |
| Mockito.doAnswer(answer).when(in).getBlockReader( |
| (InetSocketAddress) Matchers.anyObject(), |
| Matchers.anyString(), |
| (ExtendedBlock) Matchers.anyObject(), |
| (Token<BlockTokenIdentifier>) Matchers.anyObject(), |
| Matchers.anyLong(), |
| Matchers.anyLong(), |
| Matchers.anyInt(), |
| Matchers.anyBoolean(), |
| Matchers.anyString()); |
| |
| // Initial read |
| pread(in, 0, dataBuf, 0, dataBuf.length); |
| // Read again and verify that the socket is the same |
| pread(in, FILE_SIZE - dataBuf.length, dataBuf, 0, dataBuf.length); |
| pread(in, 1024, dataBuf, 0, dataBuf.length); |
| pread(in, -1, dataBuf, 0, dataBuf.length); // No seek; just read |
| pread(in, 64, dataBuf, 0, dataBuf.length / 2); |
| |
| in.close(); |
| } |
| |
| @AfterClass |
| public static void teardownCluster() throws Exception { |
| util.shutdown(); |
| } |
| } |