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https://issues.apache.org/jira/browse/HDFS-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Boudnik updated HDFS-2451:
-------------------------------------
Attachment: HDFS-2451.patch
Seems like the call to {{blockManager.countNodes()}} is happening under
namesystem's write locking elsewhere. Otherwise a race condition is likely.
> 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
>
>
> 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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