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https://issues.apache.org/jira/browse/KUDU-3407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17740489#comment-17740489
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Song Jiacheng edited comment on KUDU-3407 at 7/6/23 8:41 AM:
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[~aserbin],
So sorry that did not work on this for a long time. Busy for maintaining our
clusters, and during that I found like 10+ issues.
Is that ok if I post the issues and my solution, and then I will work on them
to find the perfect solution according to your opinions?
was (Author: song jiacheng):
[~aserbin],
So sorry that did not work on this for a long time. Busy for maintain our
clusters, and found like 10+ issues.
> MM: Give a chance to do other OP while server is under memory pressure
> ----------------------------------------------------------------------
>
> Key: KUDU-3407
> URL: https://issues.apache.org/jira/browse/KUDU-3407
> Project: Kudu
> Issue Type: Improvement
> Components: compaction
> Affects Versions: 1.14.0
> Reporter: Song Jiacheng
> Priority: Major
>
> For now, if the server is under pressure(60% memory as default),
> MaintenanceManager always find a memory-flush operation to run. So if all the
> tservers are under pressure for a long time, there will be many pending
> operations, which will lead to many problem, like redos not compact, undo not
> delete, etc..
> It might be better if we add a parameter to give a chance to do other ops,
> the formula is like this:
> Do other works? = (1 - (memory_now - pressure_threshold) / (soft_limit -
> pressure_threshold)) * kChance
> kChange should be configurable.
> This will give a probability to run other maintenance operations.
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