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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1607) Task controller may not set permissions for a task cleanup attempt's log directory
Date Wed, 28 Apr 2010 10:50:33 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated MAPREDUCE-1607:
-----------------------------------------------

    Attachment: patch-1607.txt

Patch for trunk. Patch removes tasklog truncation changes from the yahoo! patch and all other
changes are almost same.

> Task controller may not set permissions for a task cleanup attempt's log directory
> ----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1607
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1607
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task-controller
>            Reporter: Hemanth Yamijala
>            Assignee: Amareshwari Sriramadasu
>         Attachments: patch-1607-ydist.txt, patch-1607.txt
>
>
> Task controller uses the INITIALIZE_TASK command to initialize task attempt and task
log directories. For cleanup tasks, task attempt directories are named as task-attempt-id.cleanup.
But log directories do not have the .cleanup suffix. The task controller is not aware of this
distinction and tries to set permissions for log directories named task-attempt-id.cleanup.
This is a NO-OP. Typically the task cleanup runs on the same node that ran the original task
attempt as well. So, the task log directories are already properly initialized. However, the
task cleanup can run on a node that has not run the original task attempt. In that case, the
initialization would not happen and this could result in the cleanup task failing.

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