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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3333) job failing because of reassigning same tasktracker to failing tasks
Date Tue, 17 Jun 2008 13:29:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605596#action_12605596
] 

Amar Kamat commented on HADOOP-3333:
------------------------------------

The approach looks fine. I code also looks fine. Looks like this addition also addresses the
corner case raised earlier.  Some super minor comment for JobTracker.java : The patch removes
and adds LinkedHashMap. We can probably avoid that. 

> job failing because of reassigning same tasktracker to failing tasks
> --------------------------------------------------------------------
>
>                 Key: HADOOP-3333
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3333
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.16.3
>            Reporter: Christian Kunz
>            Assignee: Jothi Padmanabhan
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: hadoop-3333-v1.patch, hadoop-3333-v2.patch, hadoop-3333.patch, HADOOP-3333_0_20080503.patch,
HADOOP-3333_1_20080505.patch, HADOOP-3333_2_20080506.patch
>
>
> We have a long running a job in a 2nd atttempt. Previous job was failing and current
jobs risks to fail as well, because  reduce tasks failing on marginal TaskTrackers are assigned
repeatedly to the same TaskTrackers (probably because it is the only available slot), eventually
running out of attempts.
> Reduce tasks should be assigned to the same TaskTrackers at most twice, or TaskTrackers
need to get some better smarts to find  failing hardware.
> BTW, mapred.reduce.max.attempts=12, which is high, but does not help in this case.

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