Song Jiacheng created KUDU-3407:
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Summary: 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
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
tserver is 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 change to do other ops, the
formula is like this:
Do other works? = (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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