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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2425) Distributed simulator for stressing JobTracker and NameNode
Date Fri, 08 Apr 2011 04:13:06 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017266#comment-13017266
] 

Amar Kamat commented on MAPREDUCE-2425:
---------------------------------------

Min,
Can you kindly post some more details as to what this new simulation intends to do (as opposed
to Mumak) and the basic design? Also is it possible to modify Mumak to do what your tool is
doing. If the only difference is about scalability then I would prefer fixing Mumak and making
it better. Thoughts?

> Distributed simulator for stressing JobTracker and NameNode
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-2425
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2425
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: benchmarks
>            Reporter: Min Zhou
>              Labels: benchmark, hadoop
>             Fix For: 0.22.0
>
>         Attachments: .jpg, screenshot-1.jpg
>
>
> Hadoop need a tool for stressing JobTracker and NameNode. Mumak introduced a simulated
JobTracker, whose behavior doesn't exactly like that of the real JobTracker. Even more, mumak
can't simulate a large cluster with quite a lot of jobs run on it. On the other hand, Gridmix
v3 need hundreds of physical nodes to replay job stories. 
> You can think this tool a complementation of mumak and gridmix v3. We successfully used
this tool to simulate a 12000 nodes cluster through 4 real machines. 
> I've talk to Hong Tang and Scott Chen offline, they suggested me contributing this tool
to the hadoop community.

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