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From "Ruyue Ma (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1555) Maybe some code of MapTask is wrong.
Date Fri, 02 Apr 2010 09:46:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852770#action_12852770
] 

Ruyue Ma commented on MAPREDUCE-1555:
-------------------------------------

To: Arun C Murthy 

Who will give me an explanation?  This bug will often cause tasktracker hang. If I comment
"splitMetaInfo = null; ", anything will be ok.

> Maybe some code of MapTask is wrong.
> ------------------------------------
>
>                 Key: MAPREDUCE-1555
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1555
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>            Reporter: Ruyue Ma
>
> {code:title=MapTask.java|borderStyle=solid}
>   public void write(DataOutput out) throws IOException {
>     super.write(out);
>     if (isMapOrReduce()) {
>       splitMetaInfo.write(out);
>       splitMetaInfo = null;  // HERE:  why set null ??????
>     }
>   }
> {code} 
> In above code, if the splitMetaInfo is set null, Second Serialization (will invoke write)
will throw NullPointerException. 

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