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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Updated: (ZOOKEEPER-63) Race condition in client close() operation
Date Fri, 01 Aug 2008 16:36:32 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-63?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Hunt updated ZOOKEEPER-63:
----------------------------------

    Status: Open  (was: Patch Available)

-1 on the patch, still have the stated unresolved issues with this change:

1) there is still the stated race condition
2) what is causing the underlying hang? this should not be happening and needs to be addressed
directly, may even be related to item 1

3) if the timeout is reached a warning should be issued in the log

I suspect we should split this patch out to it's own jira and make it blocked by this, perhaps
that would make it more clear.


> Race condition in client close() operation
> ------------------------------------------
>
>                 Key: ZOOKEEPER-63
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-63
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: java client
>            Reporter: Patrick Hunt
>            Assignee: james strachan
>         Attachments: patch_ZOOKEEPER-63.patch
>
>
> There is a race condition in the java close operation on ZooKeeper.java.
> Client is sending a disconnect request to the server. Server will close any open connections
with the client when it receives this. If the client has not yet shutdown it's subthreads
(event/send threads for example) these threads may consider the condition an error. We see
this alot in the tests where the clients output error logs because they are unaware that a
disconnection has been requested by the client.
> Ben mentioned: perhaps we just have to change state to closed (on client) before sending
disconnect request.

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