[jira] [Commented] (ZOOKEEPER-1702) ZooKeeper client may write operation packets before receiving successful response to connection request, can cause TCP RST

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688406#comment-13688406 ] 

Chris Nauroth commented on ZOOKEEPER-1702:
------------------------------------------

I'm interested in getting this patch into a ZooKeeper release and upgrading to that release in Hadoop core to enable some functionality that's currently broken on Windows.  Is there anything more I can do to help move this patch forward?  Thanks!
                
> ZooKeeper client may write operation packets before receiving successful response to connection request, can cause TCP RST
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-1702
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1702
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.4.2
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>             Fix For: 3.5.0, 3.4.6
>
>         Attachments: ZOOKEEPER-1702.1.patch
>
>
> The problem occurs when a connection attempt is pending and there are multiple outbound packets in the queue for other operations.  In {{ClientCnxnSocketNIO#doIO}}, it is possible to receive notification that the socket is writable for the next operation packet before receiving notification that the socket is readable for the connection response from the server.  If the server decides that the session is expired, then it responds by immediately closing the socket on its side.  If the client has written packets after the server has closed its end of the socket, then the TCP stack may choose to abort the connection with an RST.  When this happens, the client doesn't receive an orderly shutdown, and ultimately it fails to deliver a session expired event to the application.

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