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https://issues.apache.org/jira/browse/CASSANDRA-21083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-21083:
--------------------------------------------
Change Category: Performance
Complexity: Normal
Fix Version/s: 5.x
Status: Open (was: Triage Needed)
> Optimize memtable flush logic
> -----------------------------
>
> Key: CASSANDRA-21083
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21083
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 5.x
>
>
> Memtable flushing to disk impacts write performance and can be a limiting
> factor for write throughput:
> * If we cannot flush fast enough we have to limit writes to memtables due to
> lack of available memory for them
> * flushing logic can be CPU-intensive and complete with writing threads for
> CPU by stealing 1-2 cores (or even more if memtable_flush_writers is set to a
> higher value)
> More details about suggested optimisations will be added later.
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