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Date: Fri, 12 Oct 2007 09:24:53 -0700 (PDT)
From: "Hudson (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-1874) lost task trackers -- jobs hang
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    [ https://issues.apache.org/jira/browse/HADOOP-1874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534327 ] 

Hudson commented on HADOOP-1874:
--------------------------------

Integrated in Hadoop-Nightly #269 (See [http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/269/])

> lost task trackers -- jobs hang
> -------------------------------
>
>                 Key: HADOOP-1874
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1874
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.15.0
>            Reporter: Christian Kunz
>            Assignee: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.15.0
>
>         Attachments: 1874.new.patch, 1874.new.patch, 1874.patch, lazy-dfs-ops.1.patch, lazy-dfs-ops.2.patch, lazy-dfs-ops.4.patch, lazy-dfs-ops.patch, server-throttle-hack.patch
>
>
> This happens on a 1400 node cluster using a recent nightly build patched with HADOOP-1763 (that fixes a previous 'lost task tracker' issue) running a c++-pipes job with 4200 maps and 2800 reduces. The task trackers start to get lost in high numbers at the end of job completion.
> Similar non-pipes job do not show the same problem, but is unclear whether it is related to c++-pipes. It could also be dfs overload when reduce tasks close and validate all newly created dfs files. I see dfs client rpc timeout exception. But this alone does not explain the escalation in losing task trackers.
> I also noticed that the job tracker becomes rather unresponsive with rpc timeout and call queue overflow exceptions. Job Tracker is running with 60 handlers.

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