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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5337) JobTracker greedily schedules tasks without running tasks to join
Date Wed, 01 Apr 2009 11:35:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694482#action_12694482

Amar Kamat commented on HADOOP-5337:

Tested this patch on 60 nodes and tasks are not scheduled greedily. Killed a tracker while
the jobtracker was down and the patch waits for the tracker to be lost before opening up for

> JobTracker greedily schedules tasks without running tasks to join
> -----------------------------------------------------------------
>                 Key: HADOOP-5337
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5337
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Karam Singh
>            Assignee: Amar Kamat
>         Attachments: HADOOP-5337-v1.11.patch, HADOOP-5337-v1.12.patch, HADOOP-5337-v1.7.patch,
> This issue was observed when JobTracker was restarted 3 times and observed that 4 instances
of each reduce task were running. This issue is observed when cluster is not fully occupied.
> In testcase: Map/reduces capacity is 200/200 slots respectively and Job profile is 11000
maps, 10 reduces and speculative execution is off.  JobTracker was restarted 3 times in small
intervals of about 5 mins and after recovery, 40 reduce tasks were running. Task details web
page (taskdetails.jsp) was  showing 4 running attempts of each reduce task.

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