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HDFS-7045. Fix NameNode deadlock when opening file under /.reserved path. Contributed by Yi Liu. 

(cherry picked from commit 1e684995d7)
This commit is contained in:
Andrew Wang 2014-09-11 10:59:09 -07:00
parent c90e15c559
commit 6151c2bea7
3 changed files with 26 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -383,6 +383,9 @@ Release 2.6.0 - UNRELEASED
HDFS-6621. Hadoop Balancer prematurely exits iterations.
(Rafal Wojdyla and Benjamin Bowman via wang)
HDFS-7045. Fix NameNode deadlock when opening file under /.reserved path.
(Yi Liu via wang)
BREAKDOWN OF HDFS-6134 AND HADOOP-10150 SUBTASKS AND RELATED JIRAS
HDFS-6387. HDFS CLI admin tool for creating & deleting an

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -1824,8 +1824,8 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
checkOperation(OperationCategory.WRITE);
writeLock(); // writelock is needed to set accesstime
}
src = resolvePath(src, pathComponents);
try {
src = resolvePath(src, pathComponents);
if (isReadOp) {
checkOperation(OperationCategory.READ);
} else {

22
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRead.java
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@ -17,6 +17,7 @@
*/
package org.apache.hadoop.hdfs;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
@ -80,4 +81,25 @@ public class TestRead {
testEOF(cluster, 10000);
cluster.shutdown();
}
/**
* Regression test for HDFS-7045.
* If deadlock happen, the test will time out.
* @throws Exception
*/
@Test(timeout=60000)
public void testReadReservedPath() throws Exception {
Configuration conf = new Configuration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).
numDataNodes(1).format(true).build();
try {
FileSystem fs = cluster.getFileSystem();
fs.open(new Path("/.reserved/.inodes/file"));
Assert.fail("Open a non existing file should fail.");
} catch (FileNotFoundException e) {
// Expected
} finally {
cluster.shutdown();
}
}
}