/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSClient.DFSDataInputStream;
import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
import org.junit.Assert;
import org.junit.Test;
/** Test the fileLength on cluster restarts */
public class TestFileLengthOnClusterRestart {
/**
* Tests the fileLength when we sync the file and restart the cluster and
* Datanodes not report to Namenode yet.
*/
@Test(timeout = 60000)
public void testFileLengthWithHSyncAndClusterRestartWithOutDNsRegister()
throws Exception {
final Configuration conf = new Configuration();
// create cluster
conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 512);
final MiniDFSCluster cluster = new MiniDFSCluster(conf, 2, true, null);
DFSDataInputStream in = null;
FSDataOutputStream out = null;
DistributedFileSystem dfs = null;
try {
Path path = new Path(MiniDFSCluster.getBaseDir().getPath(), "test");
dfs = (DistributedFileSystem) cluster.getFileSystem();
out = dfs.create(path);
int fileLength = 1030;
out.write(new byte[fileLength]);
out.sync();
cluster.restartNameNode();
cluster.waitActive();
in = (DFSDataInputStream) dfs.open(path, 1024);
// Verify the length when we just restart NN. DNs will register
// immediately.
Assert.assertEquals(fileLength, in.getVisibleLength());
cluster.shutdownDataNodes();
cluster.restartNameNode(false);
// This is just for ensuring NN started.
verifyNNIsInSafeMode(dfs);
try {
in = (DFSDataInputStream) dfs.open(path);
Assert.fail("Expected IOException");
} catch (IOException e) {
Assert.assertTrue(e.getLocalizedMessage().indexOf(
"Name node is in safe mode") >= 0);
}
} finally {
if (null != in) {
in.close();
}
if (null != dfs) {
dfs.dfs.clientRunning = false;
}
cluster.shutdown();
}
}
private void verifyNNIsInSafeMode(DistributedFileSystem dfs)
throws IOException {
while (true) {
try {
if (dfs.dfs.namenode.setSafeMode(SafeModeAction.SAFEMODE_GET)) {
return;
} else {
throw new IOException("Expected to be in SafeMode");
}
} catch (IOException e) {
// NN might not started completely Ignore
}
}
}
}