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https://issues.apache.org/jira/browse/HADOOP-4840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657234#action_12657234
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Hairong Kuang commented on HADOOP-4840:
---------------------------------------
I ran TestNodeCount for 50 times on my local machine without seeing NPE.
> TestNodeCount sometimes fails with NullPointerException
> -------------------------------------------------------
>
> Key: HADOOP-4840
> URL: https://issues.apache.org/jira/browse/HADOOP-4840
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.3
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.18.3
>
> Attachments: nodeCountNPE.patch, nodeCountNPE1.patch
>
>
> Testcase: testNodeCount took 9.628 sec
> Caused an ERROR
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.countNodes(FSNamesystem.java:3523)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.countNodes(FSNamesystem.java:3543)
> at
> org.apache.hadoop.hdfs.server.namenode.TestNodeCount.testNodeCount(TestNodeCount.java:64)
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