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https://issues.apache.org/jira/browse/MAPREDUCE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801025#action_12801025
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Chris Douglas commented on MAPREDUCE-1306:
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It would help if the SimulatedTaskTracker RNG were seeded deterministically
from a configurable source. If the STT cstr took a {{seed}} param, a single
source of randomness could seed each STT and allow for an exact replay.
Otherwise +1
> [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
>
>
> 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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