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https://issues.apache.org/jira/browse/CASSANDRA-11324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583755#comment-15583755
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Kurt Greaves commented on CASSANDRA-11324:
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[~iamaleksey] There was another question on mailing list regarding this. just 
wondering what you mean by multiple scrub processes processing one sstable 
each? is this possible on a single CF? I know it's possible to run one offline 
scrub for each CF however as Thom mentioned I couldn't run multiple scrubs 
across one CF.

> Make SSTABLESCRUB and related jobs multi-threaded  / parallelize somehow
> ------------------------------------------------------------------------
>
>                 Key: CASSANDRA-11324
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11324
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Thom Valley
>            Priority: Minor
>
> SSTABLE scrub right now appears to be single threaded in offline mode (unsure 
> about online).  When scrubbing a node, especially a well provisioned one, the 
> node sits mostly idle for potentially hours while scrubbing.
> Making better use of available resources through parallelization / 
> multi-threading of the scrub process seems like a good idea.



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