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https://issues.apache.org/jira/browse/AURORA-1096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14304477#comment-14304477
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Maxim Khutornenko commented on AURORA-1096:
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{quote}
The cap on JobInstanceUpdateEvent should be imposed at job update submission
time, by calculating the maximum number of instance events permitted by the
configuration.
{quote}
I don't think submission time cap is sufficient here. A job may pass the check
at submission time but go over it due to external pause/resume/pulse cycles
(AURORA-1097). Also, it may not be possible to accurately calculate the cap
here as settings like {{max_per_shard_failures}} and {{max_total_failures}} may
apply an unfair penalty for job updates close to the limit.
> Scheduler updater should limit the number of job/instance events
> ----------------------------------------------------------------
>
> Key: AURORA-1096
> URL: https://issues.apache.org/jira/browse/AURORA-1096
> Project: Aurora
> Issue Type: Story
> Components: Scheduler
> Reporter: Maxim Khutornenko
>
> Large/flapping scheduler job updates may generate too many events in the
> update store. The update settings are fully controlled by the user and there
> is a potential for a misconfigured job update to completely overwhelm our
> in-memory DB storage with job update instance events.
> For example, a large flapping update with {{max_per_shard_failures}} and
> {{max_total_failures}} set to max INT when left unattended can quickly
> consume all available RAM and kill the scheduler. A manual cleanup of the
> scheduler log would be needed to bring the scheduler up.
> This can be especially relevant with the introduction of update heartbeats
> (AURORA-690) that can further exacerbate the problem (e.g. when
> {{blockIfNoPulseAfterMs}} set too low wrt the external service pulse rate).
> We need to cap the max per-job lifetime count of {{JobUpdateEvent}} and
> {{JobInstanceUpdateEvent}} instances. A nice bonus would be providing a hint
> in the UI when the event sequence is cut off.
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