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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5374) NPE in JobTracker.getTasksToSave() method
Date Mon, 02 Mar 2009 11:16:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677958#action_12677958

Vinod K V commented on HADOOP-5374:

Here's the exact scenario:
 - A TT gets a task but fails to report back immediately, making the JT mark the task as FAILED.
 - The TT comes back with the task in COMMIT_PENDING state.
 - JT doesn't update the task's state on itself as task cannot go from FAILED to COMMIT_PENDING
state. (See state checks in TIP.updateStatus()). Thus TIP.doCommit() is not called.
 - In getTasksToSave(), JT just checks the task's status on TT and tries to save the task,
thus hitting NPE in TIP.shouldCommit().

Effect : The TT will keep getting NPE in heartbeat and become useless. The job will proceed
as a duplicate task will be launched for this TIP.

> NPE in JobTracker.getTasksToSave() method
> -----------------------------------------
>                 Key: HADOOP-5374
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5374
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Vinod K V

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