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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5856) DataNode.checkDiskError might throw NPE
Date Thu, 30 Jan 2014 18:42:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886893#comment-13886893
] 

Josh Elser commented on HDFS-5856:
----------------------------------

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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