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From "Tamas Sarlos (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1306) [MUMAK] Randomize the arrival of heartbeat responses
Date Wed, 16 Dec 2009 23:39:18 GMT
[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

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
- 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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