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Date: Thu, 16 Feb 2012 23:22:58 +0000 (UTC)
From: "Todd Lipcon (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3851) Allow more aggressive action on
 detection of the jetty issue
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209881#comment-13209881 ] 

Todd Lipcon commented on MAPREDUCE-3851:
----------------------------------------

Ratio over the last N requests sound good. I was worried about false triggering - eg if you get one random exception once every 100000 calls, but your TT is up for months, it will eventually crash with the other approach.
                
> Allow more aggressive action on detection of the jetty issue
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-3851
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3851
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 1.0.0
>            Reporter: Kihwal Lee
>            Assignee: Thomas Graves
>             Fix For: 1.1.0, 1.0.1
>
>         Attachments: MAPREDUCE-3851.patch
>
>
> MAPREDUCE-2529 added the useful failure detection mechanism. In this jira, I propose we add a periodic check inside TT and configurable action to self-destruct. Blacklisting helps but is not enough. Hung jetty still accepts connection and it takes very long time for clients to fail out. Short jobs are delayed for hours because of this. This feature will be a nice companion to MAPREDUCE-3184.

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