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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11854) Remove finished streaming connections from MessagingService
Date Tue, 07 Jun 2016 15:19:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318661#comment-15318661
] 

Yuki Morishita commented on CASSANDRA-11854:
--------------------------------------------

Thanks for the patch.

* You actually registerring 2 callbacks (for incoming and outgoing) to the same {{StreamResultFuture}}
instance. It is harmless, but isn't it better to pass callback to {{initReceivingSide}}?
* I prefer putting {{IncomingStreamingConnection.this}} instead of {{this}} in callback for
clarity.

> Remove finished streaming connections from MessagingService
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-11854
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11854
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Paulo Motta
>            Assignee: Paulo Motta
>         Attachments: oom.png
>
>
> When a new {{IncomingStreamingConnection}} is created, [we register it in the connections
map|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/net/MessagingService.java#L1109]
of {{MessagingService}}, but we [only remove it if there is an exception|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/net/IncomingStreamingConnection.java#L83]
while attaching the socket to the stream session.
> On nodes with SSL and large number of vnodes, after many repair sessions these old connections
can accumulate and cause OOM (heap dump attached).
> The connection should be removed from the connections map after if it's finished in order
to be garbage collected.



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