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Date: Fri, 4 May 2007 01:58:15 -0700 (PDT)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-1276) TaskTracker expiry interval is not
 configurable
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    [ https://issues.apache.org/jira/browse/HADOOP-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493624 ] 

Arun C Murthy commented on HADOOP-1276:
---------------------------------------

Here is a straight-forward patch...

Personally I find this feature quite useful, especially when dealing with issues relating to lost trackers... I'm not very sure about the original constraints which led to this being hard-coded and would acquiesce to the same.

> TaskTracker expiry interval is not configurable
> -----------------------------------------------
>
>                 Key: HADOOP-1276
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1276
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>         Environment: all
>            Reporter: Alejandro Abdelnur
>         Assigned To: Arun C Murthy
>             Fix For: 0.13.0
>
>         Attachments: HADOOP-1276_20070504_1.patch
>
>
> The tasktracker expiry interval is hardcoded to 10 mins with the MRConstants.TASKTRACKER_EXPIRY_INTERVAL constant.
> For small clusters, running small jobs, this interval is too high.
> Making it configurable it would require:
>  * Introducing a 'tasktracker.expiry.interval' property with default value of 10 mins.
>  * Load the property in the JobTracker
>  * Change the 5 usages of the constant by a property in the JobTracker
>  * Remove the constant from MRConstants
>  * add default value to the hadoop-default.xml file

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