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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2013/06/25 17:00:26 UTC

[jira] [Updated] (CASSANDRA-5699) Streaming (2.0) can deadlock

     [ https://issues.apache.org/jira/browse/CASSANDRA-5699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne updated CASSANDRA-5699:
----------------------------------------

    Attachment: 5699.txt
    
> 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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