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HDFS-4781. Fix a NullPointerException when listing .snapshot under a non-existing directory. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1478135 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-05-01 18:33:08 +00:00
parent faca77f227
commit 7c14f1557b
5 changed files with 24 additions and 6 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-2802.txt
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@ -329,3 +329,6 @@ Branch-2802 Snapshot (Unreleased)
HDFS-4758. Disallow nested snapshottable directories and unwrap
RemoteException. (szetszwo)
HDFS-4781. Fix a NullPointerException when listing .snapshot under
a non-existing directory. (szetszwo)

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
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@ -1588,7 +1588,8 @@ public class FSDirectory implements Closeable {
src.length() - HdfsConstants.DOT_SNAPSHOT_DIR.length()));
final INode node = this.getINode(dirPath);
if (node.isDirectory()
if (node != null
&& node.isDirectory()
&& node.asDirectory() instanceof INodeDirectorySnapshottable) {
return new HdfsFileStatus(0, true, 0, 0, 0, 0, null, null, null, null,
HdfsFileStatus.EMPTY_NAME, -1L);

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java
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@ -313,12 +313,12 @@ public abstract class INode implements Diff.Element<byte[]> {
* children.
*
* 1.3 The current inode is a {@link FileWithSnapshot}.
* Call {@link INode#recordModification(Snapshot)} to capture the
* current states. Mark the INode as deleted.
* Call recordModification(..) to capture the current states.
* Mark the INode as deleted.
*
* 1.4 The current inode is a {@link INodeDirectoryWithSnapshot}.
* Call {@link INode#recordModification(Snapshot)} to capture the
* current states. Destroy files/directories created after the latest snapshot
* Call recordModification(..) to capture the current states.
* Destroy files/directories created after the latest snapshot
* (i.e., the inodes stored in the created list of the latest snapshot).
* Recursively clean remaining children.
*

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java
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@ -111,7 +111,7 @@ public class INodeDirectory extends INodeWithAdditionalFields {
* Remove the specified child from this directory.
*
* @param child the child inode to be removed
* @param latest See {@link INode#recordModification(Snapshot)}.
* @param latest See {@link INode#recordModification(Snapshot, INodeMap)}.
*/
public boolean removeChild(INode child, Snapshot latest,
final INodeMap inodeMap) throws QuotaExceededException {

14
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSnapshotPathINodes.java
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@ -22,6 +22,8 @@ import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.io.FileNotFoundException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
@ -238,6 +240,18 @@ public class TestSnapshotPathINodes {
final INode last = nodesInPath.getLastINode();
assertEquals(last.getFullPathName(), sub1.toString());
assertFalse(last instanceof INodeFileWithSnapshot);
String[] invalidPathComponent = {"invalidDir", "foo", ".snapshot", "bar"};
Path invalidPath = new Path(invalidPathComponent[0]);
for(int i = 1; i < invalidPathComponent.length; i++) {
invalidPath = new Path(invalidPath, invalidPathComponent[i]);
try {
hdfs.getFileStatus(invalidPath);
Assert.fail();
} catch(FileNotFoundException fnfe) {
System.out.println("The exception is expected: " + fnfe);
}
}
}
/**