[ http://issues.apache.org/jira/browse/HADOOP-610?page=all ]
Owen O'Malley updated HADOOP-610:
---------------------------------
Status: Patch Available (was: Open)
> Task Tracker offerService does not adequately protect from exceptions
> ---------------------------------------------------------------------
>
> Key: HADOOP-610
> URL: http://issues.apache.org/jira/browse/HADOOP-610
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.7.1
> Reporter: Owen O'Malley
> Assigned To: Owen O'Malley
> Fix For: 0.8.0
>
> Attachments: lost-tt.patch
>
>
> The TaskTracker's offerService loop doesn't handle exceptions, such as time
> outs well and will reset the task tracker. I believe this is the cause of
> most of the lost task trackers. The scenario looks like:
> 1. an rpc timeout in offerService
> 2. the task tracker cleans up (which takes 30 minutes with the task tracker
> locked up)
> 3. the task tracker is declared lost for not providing its heartbeat
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