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https://issues.apache.org/jira/browse/CASSANDRA-9304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988524#comment-14988524
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Stefania commented on CASSANDRA-9304:
-------------------------------------

Unfortunately testing on Windows revealed there is a bit more work to do. It 
appears multiprocessing on Windows is more limited: because of the lack of 
{{os.fork}}, the worker process class has to be _picklable_. This means 
changing a few things.

> COPY TO improvements
> --------------------
>
>                 Key: CASSANDRA-9304
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9304
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Minor
>              Labels: cqlsh
>             Fix For: 3.x, 2.1.x, 2.2.x
>
>
> COPY FROM has gotten a lot of love.  COPY TO not so much.  One obvious 
> improvement could be to parallelize reading and writing (write one page of 
> data while fetching the next).



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