Andrew Wong created KUDU-2929:
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Summary: Don't starve compactions under memory pressure
Key: KUDU-2929
URL: https://issues.apache.org/jira/browse/KUDU-2929
Project: Kudu
Issue Type: Improvement
Components: perf, tablet
Reporter: Andrew Wong
When a server is under memory pressure, the maintenance manager exclusively
will look for the maintenance op that frees up the most memory. Some
operations, like compactions, do not register any amount of "anchored memory"
and effectively don't qualify for consideration.
This means that when a tablet server is under memory pressure, compactions will
never be scheduled, even though compacting may actually end up reducing memory
(e.g. combining many rowsets-worth of CFileReaders into a single rowset). While
it makes sense to prefer flushes to compactions, it probably doesn't make sense
to do nothing vs compact.
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