YifanZhang created KUDU-3180:
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Summary: kudu don't always prefer to flush MRS/DMS that anchor
more memory
Key: KUDU-3180
URL: https://issues.apache.org/jira/browse/KUDU-3180
Project: Kudu
Issue Type: Bug
Reporter: YifanZhang
Attachments: image-2020-08-04-20-26-53-749.png,
image-2020-08-04-20-28-00-665.png
Current time-based flush policy always give a flush op a high score if we
haven't flushed for the tablet in a long time, that may lead to starvation of
ops that could free more memory.
We set -flush_threshold_mb=32, -flush_threshold_secs=1800 in a cluster, and
find that some small MRS/DMS flushes has a higher perf score than big MRS/DMS
flushes and compactions, which seems not so reasonable.
!image-2020-08-04-20-26-53-749.png|width=1424,height=317!!image-2020-08-04-20-28-00-665.png|width=1414,height=327!
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