[jira] [Assigned] (CASSANDRA-21083) Optimize memtable flush logic

["Dmitry Konstantinov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-21083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitry Konstantinov reassigned CASSANDRA-21083:
-----------------------------------------------

    Assignee: Dmitry Konstantinov

> 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
>
> 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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