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https://issues.apache.org/jira/browse/CASSANDRA-3576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163604#comment-13163604
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Sylvain Lebresne commented on CASSANDRA-3576:
---------------------------------------------

Despite the analogy with memtables, I don't think the uses case are samilar and 
I'm not convinced that using multiple thread to feed a writer will be a better 
win than actually using multiple writers. But since it's easy, I'm fine making 
the unsorted writer thread safe.
                
> make AbstractSSTableSimpleWriters threadsafe
> --------------------------------------------
>
>                 Key: CASSANDRA-3576
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3576
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.8.1
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 1.1
>
>
> I took a quick look and the Unsorted writer has a non-threadsafe 
> getColumnFamily method.  I did not look deeper than that.

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