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HDFS-8463. Calling DFSInputStream.seekToNewSource just after stream creation causes NullPointerException. Contributed by Masatake Iwasaki. 

(cherry picked from commit ade6d9a61e)
This commit is contained in:
Kihwal Lee 2015-06-04 12:52:49 -05:00
parent 78d626fa89
commit f0f277ddd0
3 changed files with 31 additions and 0 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -509,6 +509,9 @@ Release 2.8.0 - UNRELEASED
HDFS-3716. Purger should remove stale fsimage ckpt files
(J.Andreina via vinayakumarb)
HDFS-8463. Calling DFSInputStream.seekToNewSource just after stream creation
causes NullPointerException (Masatake Iwasaki via kihwal)
Release 2.7.1 - UNRELEASED
INCOMPATIBLE CHANGES

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
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@ -1533,6 +1533,9 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
*/
@Override
public synchronized boolean seekToNewSource(long targetPos) throws IOException {
if (currentNode == null) {
return seekToBlockSource(targetPos);
}
boolean markedDead = deadNodes.containsKey(currentNode);
addToDeadNodes(currentNode);
DatanodeInfo oldNode = currentNode;

25
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSInputStream.java
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@ -18,6 +18,8 @@
package org.apache.hadoop.hdfs;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.hamcrest.CoreMatchers.equalTo;
import java.io.File;
@ -28,6 +30,7 @@ import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.net.unix.DomainSocket;
import org.apache.hadoop.net.unix.TemporarySocketDirectory;
import org.junit.Assume;
@ -111,4 +114,26 @@ public class TestDFSInputStream {
}
}
@Test(timeout=60000)
public void testSeekToNewSource() throws IOException {
Configuration conf = new Configuration();
MiniDFSCluster cluster =
new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
DistributedFileSystem fs = cluster.getFileSystem();
Path path = new Path("/testfile");
DFSTestUtil.createFile(fs, path, 1024, (short) 3, 0);
DFSInputStream fin = fs.dfs.open("/testfile");
try {
fin.seekToNewSource(100);
assertEquals(100, fin.getPos());
DatanodeInfo firstNode = fin.getCurrentDatanode();
assertNotNull(firstNode);
fin.seekToNewSource(100);
assertEquals(100, fin.getPos());
assertFalse(firstNode.equals(fin.getCurrentDatanode()));
} finally {
fin.close();
cluster.shutdown();
}
}
}