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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5856) DataNode.checkDiskError might throw NPE
Date Fri, 31 Jan 2014 05:16:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13887477#comment-13887477

Hadoop QA commented on HDFS-5856:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/5998//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5998//console

This message is automatically generated.

> 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, 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

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