| /** |
| * 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.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys; |
| import org.junit.Assert; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DFSTestUtil.ShortCircuitTestContext; |
| import org.junit.Test; |
| |
| public class TestRead { |
| final private int BLOCK_SIZE = 512; |
| |
| private void testEOF(MiniDFSCluster cluster, int fileLength) throws IOException { |
| FileSystem fs = cluster.getFileSystem(); |
| Path path = new Path("testEOF." + fileLength); |
| DFSTestUtil.createFile(fs, path, fileLength, (short)1, 0xBEEFBEEF); |
| FSDataInputStream fis = fs.open(path); |
| ByteBuffer empty = ByteBuffer.allocate(0); |
| // A read into an empty bytebuffer at the beginning of the file gives 0. |
| Assert.assertEquals(0, fis.read(empty)); |
| fis.seek(fileLength); |
| // A read into an empty bytebuffer at the end of the file gives -1. |
| Assert.assertEquals(-1, fis.read(empty)); |
| if (fileLength > BLOCK_SIZE) { |
| fis.seek(fileLength - BLOCK_SIZE + 1); |
| ByteBuffer dbb = ByteBuffer.allocateDirect(BLOCK_SIZE); |
| Assert.assertEquals(BLOCK_SIZE - 1, fis.read(dbb)); |
| } |
| fis.close(); |
| } |
| |
| @Test(timeout=60000) |
| public void testEOFWithBlockReaderLocal() throws Exception { |
| ShortCircuitTestContext testContext = |
| new ShortCircuitTestContext("testEOFWithBlockReaderLocal"); |
| try { |
| final Configuration conf = testContext.newConfiguration(); |
| conf.setLong(HdfsClientConfigKeys.DFS_CLIENT_CACHE_READAHEAD, BLOCK_SIZE); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1) |
| .format(true).build(); |
| testEOF(cluster, 1); |
| testEOF(cluster, 14); |
| testEOF(cluster, 10000); |
| cluster.shutdown(); |
| } finally { |
| testContext.close(); |
| } |
| } |
| |
| @Test(timeout=60000) |
| public void testEOFWithRemoteBlockReader() throws Exception { |
| final Configuration conf = new Configuration(); |
| conf.setLong(HdfsClientConfigKeys.DFS_CLIENT_CACHE_READAHEAD, BLOCK_SIZE); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1) |
| .format(true).build(); |
| testEOF(cluster, 1); |
| testEOF(cluster, 14); |
| testEOF(cluster, 10000); |
| cluster.shutdown(); |
| } |
| |
| /** |
| * Regression test for HDFS-7045. |
| * If deadlock happen, the test will time out. |
| * @throws Exception |
| */ |
| @Test(timeout=60000) |
| public void testReadReservedPath() throws Exception { |
| Configuration conf = new Configuration(); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf). |
| numDataNodes(1).format(true).build(); |
| try { |
| FileSystem fs = cluster.getFileSystem(); |
| fs.open(new Path("/.reserved/.inodes/file")); |
| Assert.fail("Open a non existing file should fail."); |
| } catch (FileNotFoundException e) { |
| // Expected |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| } |