/**
* 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.IOException;
import java.nio.ByteBuffer;
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(DFSConfigKeys.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(DFSConfigKeys.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();
}
}