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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5394) JobTracker might schedule 2 attempts of the same task with the same attempt id across restarts
Date Thu, 02 Apr 2009 09:40:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694935#action_12694935
] 

Amar Kamat commented on HADOOP-5394:
------------------------------------

{{TestSocketFactory}} and {{TestCapacityScheduler}} failed. {{TestCapacityScheduler}} fails
on trunk while {{TestSocketFactory}}  fails because of the patch. Investigating. 

> JobTracker might schedule 2 attempts of the same task with the same attempt id across
restarts
> ----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5394
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5394
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>            Priority: Critical
>         Attachments: HADOOP-5394-v1.2.patch, HADOOP-5394-v1.5.patch, HADOOP-5394-v1.9.1.patch
>
>
> This can happen when the jobtracker gets restarted more than once. In such cases, the
jobtracker depends on the jobhistory file for the next restart count. If the new restart-count
is not flushed to the file then there is a fair chance that upon next restart, the jobtracker
might schedule a new attempt with an existing id. This can cause problems not only with the
side-effect files but also can cause the jobtracker to be in an inconsistent state.

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