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https://issues.apache.org/jira/browse/CASSANDRA-5699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699097#comment-13699097
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Jonathan Ellis commented on CASSANDRA-5699:
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Ship it!
> Streaming (2.0) can deadlock
> ----------------------------
>
> Key: CASSANDRA-5699
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5699
> Project: Cassandra
> Issue Type: Bug
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 2.0 beta 1
>
> Attachments: 5699.txt
>
>
> The new streaming implementation (CASSANDRA-5286) creates 2 threads per host
> for streaming, one for the incoming stream and one for the outgoing one.
> However, both currently share the same socket, but since we use synchronous
> I/O, a read can block a write, which can result in a deadlock if 2 nodes are
> both blocking on a read a the same time, thus blocking their respective
> writes (this is actually fairly easy to reproduce with a simple repair).
> So instead attaching a patch that uses one socket per thread.
> The patch also correct the stream throughput throttling calculation that was
> 8000 times lower than what it should be.
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