/**
* 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.fs;
import junit.framework.TestCase;
import java.io.*;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.StringUtils;
/**
* test for the input truncation bug when mark/reset is used.
* HADOOP-1489
*/
public class TestTruncatedInputBug extends TestCase {
private static String TEST_ROOT_DIR =
new Path(System.getProperty("test.build.data","/tmp"))
.toString().replace(' ', '+');
private void writeFile(FileSystem fileSys,
Path name, int nBytesToWrite)
throws IOException {
DataOutputStream out = fileSys.create(name);
for (int i = 0; i < nBytesToWrite; ++i) {
out.writeByte(0);
}
out.close();
}
/**
* When mark() is used on BufferedInputStream, the request
* size on the checksum file system can be small. However,
* checksum file system currently depends on the request size
* >= bytesPerSum to work properly.
*/
public void testTruncatedInputBug() throws IOException {
final int ioBufSize = 512;
final int fileSize = ioBufSize*4;
int filePos = 0;
Configuration conf = new Configuration();
conf.setInt("io.file.buffer.size", ioBufSize);
FileSystem fileSys = FileSystem.getLocal(conf);
try {
// First create a test input file.
Path testFile = new Path(TEST_ROOT_DIR, "HADOOP-1489");
writeFile(fileSys, testFile, fileSize);
assertTrue(fileSys.exists(testFile));
assertTrue(fileSys.getLength(testFile) == fileSize);
// Now read the file for ioBufSize bytes
FSDataInputStream in = fileSys.open(testFile, ioBufSize);
// seek beyond data buffered by open
filePos += ioBufSize * 2 + (ioBufSize - 10);
in.seek(filePos);
// read 4 more bytes before marking
for (int i = 0; i < 4; ++i) {
if (in.read() == -1) {
break;
}
++filePos;
}
// Now set mark() to trigger the bug
// NOTE: in the fixed code, mark() does nothing (not supported) and
// hence won't trigger this bug.
in.mark(1);
System.out.println("MARKED");
// Try to read the rest
while (filePos < fileSize) {
if (in.read() == -1) {
break;
}
++filePos;
}
in.close();
System.out.println("Read " + filePos + " bytes."
+ " file size=" + fileSize);
assertTrue(filePos == fileSize);
} finally {
try {
fileSys.close();
} catch (Exception e) {
// noop
}
}
} // end testTruncatedInputBug
}