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https://issues.apache.org/jira/browse/HDFS-5856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886893#comment-13886893
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Josh Elser commented on HDFS-5856:
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Current patch also applies cleanly to branch-2.
> DataNode.checkDiskError might throw NPE
> ---------------------------------------
>
> Key: HDFS-5856
> URL: https://issues.apache.org/jira/browse/HDFS-5856
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.2.0
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Minor
> Attachments: HDFS-5856.diff
>
>
> Running a small 2.2.0 cluster with a heavy workload. I noticed in the
> DataNode log that when faced with network exceptions, I would sometimes get a
> NullPointerException from checkDiskError.
> Looking at the code, if the Exception that is handed to checkDiskError
> contains a null message, the checks that try to identify if the Exception is
> network-related will throw a NPE.
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