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Date: Fri, 21 May 2010 10:42:18 -0400 (EDT)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-615) TestLargeDirectoryDelete fails with
 NullPointerException
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    [ https://issues.apache.org/jira/browse/HDFS-615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870000#action_12870000 ] 

Steve Loughran commented on HDFS-615:
-------------------------------------

The line in question has two options to go null, the minicluster is null or cluster is up but the namesystem itself is null
{code}
return (int)mc.getNamesystem().getBlocksTotal();
{code}

> TestLargeDirectoryDelete fails with NullPointerException
> --------------------------------------------------------
>
>                 Key: HDFS-615
>                 URL: https://issues.apache.org/jira/browse/HDFS-615
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.21.0
>         Environment: 64-bit debian 5, 64-bit sun java6, running in a single processor VM.
>            Reporter: Eli Collins
>            Priority: Minor
>         Attachments: HDFS-615.patch, TestLargeDirectoryDelete.zip
>
>
> I've hit the following failure two out of two times running "ant test" at rev 813587. This test doesn't appear to be failing on hudson. All other tests passed except TestHDFSFileSystemContract which timed out, so perhaps there's a race due to the test executing slowly. 
>     [junit] Running org.apache.hadoop.hdfs.server.namenode.TestLargeDirectoryDelete
>     [junit] Exception in thread "Thread-30148" java.lang.NullPointerException
>     [junit] 	at org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter.getNamesystem(NameNodeAdapter.java:32)
>     [junit] 	at org.apache.hadoop.hdfs.MiniDFSCluster.getNamesystem(MiniDFSCluster.java:522)
>     [junit] 	at org.apache.hadoop.hdfs.server.namenode.TestLargeDirectoryDelete.getBlockCount(TestLargeDirectoryDelete.java:75)
>     [junit] 	at org.apache.hadoop.hdfs.server.namenode.TestLargeDirectoryDelete.access$000(TestLargeDirectoryDelete.java:38)
>     [junit] 	at org.apache.hadoop.hdfs.server.namenode.TestLargeDirectoryDelete$1.run(TestLargeDirectoryDelete.java:90)
>     [junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 94.264 sec
>                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^  No failures or errors?
>   public static FSNamesystem getNamesystem(NameNode namenode) {
>     return namenode.getNamesystem();                                                           <===========
>   }

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