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https://issues.apache.org/jira/browse/KUDU-3407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Song Jiacheng updated KUDU-3407:
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Description:
* 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.
was:
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.
> 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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