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https://issues.apache.org/jira/browse/CASSANDRA-7459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14045341#comment-14045341
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Peter Williams commented on CASSANDRA-7459:
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The attached patch is pretty simple, it just calls the existing `closeInternal`
method before shutting down the client thread.
> CqlRecordWriter doesn't close socket connections
> ------------------------------------------------
>
> Key: CASSANDRA-7459
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7459
> Project: Cassandra
> Issue Type: Bug
> Reporter: Peter Williams
> Fix For: 2.0.9
>
> Attachments: cassandra-2.0-7459.txt
>
>
> Using spark with `CqlOutputFormat` results in thousands of open connections
> to cassandra (and then crashes unless they get garbage collected fast
> enough). This is because each save to cassandra task creates a
> `CqlRecordWriter` which opens a bunch of connections but calling close on
> those writers does not actually close their socket connections to cassandra.
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