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https://issues.apache.org/jira/browse/YARN-1187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17382305#comment-17382305
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Anup Agarwal commented on YARN-1187:
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Currently the alarm events which have the same time instant are sorted
arbitrarily using the alarm's UUID. This can cause causally dependent events to
be triggered/handled out of order.
To fix this, a sequence number – that is incremented at creation of an alarm --
can be added to each alarm so that causal order between events is preserved in
the simulation.
> Add discrete event-based simulation to yarn scheduler simulator
> ---------------------------------------------------------------
>
> Key: YARN-1187
> URL: https://issues.apache.org/jira/browse/YARN-1187
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Wei Yan
> Assignee: Andrew Chung
> Priority: Major
> Attachments: YARN-1187 design doc.pdf,
> YARN-1187-branch-2.1.3.001.patch, YARN-1187-trunk.001.patch
>
>
> Follow the discussion in YARN-1021.
> Discrete event simulation decouples the running from any real-world clock.
> This allows users to step through the execution, set debug points, and
> definitely get a deterministic rexec.
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