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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3333) job failing because of reassigning same tasktracker to failing tasks
Date Tue, 17 Jun 2008 10:27:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605541#action_12605541
] 

Jothi Padmanabhan commented on HADOOP-3333:
-------------------------------------------

Findbugs is complaining on this piece of code

{
Integer numTaskTrackersInHost;
.
.
numTaskTrackersInHost ++;
uniqueHosts.put(host, numTaskTrackersinHost);
}

It appears that while the compiler is handling the case of applying native integer operations
to the Integer object, findbugs is confused.

> 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.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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