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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5548) Observed negative running maps on the job tracker
Date Tue, 24 Mar 2009 15:14:13 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Devaraj Das updated HADOOP-5548:

    Status: Open  (was: Patch Available)

This patch doesn't look like the right fix w.r.t the JobTracker locking in the JobRecovery
methods. For example, the place where the call to updateTaskTrackerStatus is made, it locks
only the taskTrackers object, but it should be locking JobTracker and trackerExpiryQueue as
well. This is in line with keeping future maintenance in mind as Owen had pointed out.
For now, what I will do is that I will commit a portion of the patch that handles the negative
counts of maps/reduces, and commit that part as part of HADOOP-5231.

> Observed negative running maps on the job tracker
> -------------------------------------------------
>                 Key: HADOOP-5548
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5548
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: Owen O'Malley
>            Assignee: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.19.2, 0.20.0
>         Attachments: patch-5548.txt
> We saw in both the web/ui and cli tools:
> {noformat}
> Cluster Summary (Heap Size is 11.7 GB/13.37 GB)
> Maps  Reduces Total       Nodes  Map Task  Reduce Task  Avg.     Blacklisted 
>               Submissions        Capacity   Capacity   Tasks/Node Nodes
> -971  0       133         434     1736        1736      8.00        0
> {noformat}

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