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From "Ruyue Ma (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1555) tasktracker heartbeat hang
Date Thu, 15 Apr 2010 07:36:51 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ruyue Ma updated MAPREDUCE-1555:
--------------------------------

        Summary: tasktracker heartbeat hang  (was: Maybe some code of MapTask is wrong.)
    Description: 
Maybe some code of MapTask is wrong.

{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. 

  was:
{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. 


> tasktracker heartbeat hang
> --------------------------
>
>                 Key: MAPREDUCE-1555
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1555
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>            Reporter: Ruyue Ma
>
> Maybe some code of MapTask is wrong.
> {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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