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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2451) TestNodeCount.testNodeCount failes with NPE
Date Wed, 19 Oct 2011 21:37:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131028#comment-13131028
] 

Konstantin Shvachko commented on HDFS-2451:
-------------------------------------------

Looks like a race condition going on in the test itself. BlockManager.countNodes() should
be called under a lock (readLock() TestNodeCount). If not under lock somebody can remove a
replica between nodeIter.hasNext() and nodeIter.next() in countNodes(), which will return
NULL and cause NPE.
                
> TestNodeCount.testNodeCount failes with NPE
> -------------------------------------------
>
>                 Key: HDFS-2451
>                 URL: https://issues.apache.org/jira/browse/HDFS-2451
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Boudnik
>            Priority: Blocker
>         Attachments: HDFS-2451.patch, HDFS-2451.patch
>
>
> in the [commit build #97|http://is.gd/UPuXg2] TestNodeCount.testNodeCount failed with
NPE
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.hadoop.hdfs.server.namenode.BlockManager.countNodes(BlockManager.java:1436)
> 	at org.apache.hadoop.hdfs.server.namenode.TestNodeCount.__CLR2_4_39bdgm6whp(TestNodeCount.java:119)
> 	at org.apache.hadoop.hdfs.server.namenode.TestNodeCount.testNodeCount(TestNodeCount.java:40)
> {noformat}

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