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From "Harsh J (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-471) Refactor JobTracker.Expire* arround an utility class
Date Thu, 29 Dec 2011 06:44:30 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Harsh J resolved MAPREDUCE-471.

    Resolution: Not A Problem

Patch and ticket have gone stale. If you want to pursue this, please reopen and provide a
fresher patch. Also, with MR2 in now, this may be irrelevant - but don't quote me on that.
> Refactor JobTracker.Expire* arround an utility class
> ----------------------------------------------------
>                 Key: MAPREDUCE-471
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-471
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Brice Arnould
>            Priority: Minor
>         Attachments: ExpiringHashSet.patch
> I would like to propose a new class, called ExpiringHashSet, which could factorize the
code from JobTracker.ExpireLaunchingTasks and JobTracker.ExpireTrackers.
> It behaves like an ordinary HashSet, but adds two methods and one argument to the constructor.
> That argument, {{lifeTime}}, tells after how much milliseconds an element added to the
container expire and is removed.
> The first method, {{update(element)}}, takes an element as it argument and delay it's
expiration by {{lifeTime}} milliseconds.
> The last method, {{makeExpire}} is called by the ExpiringHashSet just before it remove
an old item. If that method return false, the item won't be removed.
> Nothing expire while we're synchronized on the ExpiringHashSet.

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