/**
* 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.server.datanode;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSClient;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.LeaseManager;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.junit.Before;
import java.io.IOException;
/**
* This class tests the cases of a concurrent reads/writes to a file;
* ie, one writer and one or more readers can see unfinsihed blocks
*/
public class TestDataBlockScanner extends junit.framework.TestCase {
private static final Logger LOG =
Logger.getLogger(TestDataBlockScanner.class);
{
((Log4JLogger) LeaseManager.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger) FSNamesystem.LOG).getLogger().setLevel(Level.ALL);
((Log4JLogger) DFSClient.LOG).getLogger().setLevel(Level.ALL);
}
static final int blockSize = 8192;
private MiniDFSCluster cluster;
private FileSystem fileSystem;
@Before
protected void setUp() throws Exception {
super.setUp();
final Configuration conf = new Configuration();
init(conf);
}
@Override
protected void tearDown() throws Exception {
cluster.shutdown();
super.tearDown();
}
private void init(Configuration conf) throws IOException {
if (cluster != null) {
cluster.shutdown();
}
cluster = new MiniDFSCluster(conf, 1, true, null);
cluster.waitClusterUp();
fileSystem = cluster.getFileSystem();
}
public void testPrematureDataBlockScannerAdd() throws IOException {
// check that / exists
Path path = new Path("/");
System.out.println("Path : \"" + path.toString() + "\"");
System.out.println(fileSystem.getFileStatus(path).isDir());
assertTrue("/ should be a directory",
fileSystem.getFileStatus(path).isDir());
// create a new file in the root, write data, do no close
Path file1 = new Path("/unfinished-block");
FSDataOutputStream out = fileSystem.create(file1);
int writeSize = blockSize / 2;
out.write(new byte[writeSize]);
out.sync();
FSDataInputStream in = fileSystem.open(file1);
byte[] buf = new byte[4096];
in.readFully(0, buf);
in.close();
waitForBlocks(fileSystem, file1, 1, writeSize);
int blockMapSize = cluster.getDataNodes().get(0).blockScanner.blockMap.size();
assertTrue(
String.format("%d entries in blockMap and it should be empty", blockMapSize),
blockMapSize == 0
);
out.close();
}
private void waitForBlocks(FileSystem fileSys, Path name, int blockCount, long length)
throws IOException {
// wait until we have at least one block in the file to read.
boolean done = false;
while (!done) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
done = true;
BlockLocation[] locations = fileSys.getFileBlockLocations(
fileSys.getFileStatus(name), 0, length);
if (locations.length < blockCount) {
done = false;
continue;
}
}
}
}