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From "Tamas Sarlos (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1306) [MUMAK] Randomize the arrival of heartbeat responses
Date Wed, 10 Mar 2010 19:33:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843727#action_12843727
] 

Tamas Sarlos commented on MAPREDUCE-1306:
-----------------------------------------

+1 for Hong's change, it is clearly better that way.

> [MUMAK] Randomize the arrival of heartbeat responses
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-1306
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1306
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/mumak
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Tamas Sarlos
>            Assignee: Tamas Sarlos
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: MAPREDUCE-1306-20100108.patch, MAPREDUCE-1306-20100308-hong.patch,
MAPREDUCE-1306-20100308.patch
>
>
> We propose to make the following changes to mumak, MAPREDUCE-728
> - make the timing of heartbeat responses more realistic by adding an option to randomly
perturb them
> - randomize the startup time of task trackers in a fixed interval 
> - remove 2 magic constants from SimulatorEngine and make sure that the first job is submitted
only after the entire cluster is up and running

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