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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-542) c-client can spin when server unresponsive
Date Thu, 08 Oct 2009 10:58:32 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763444#action_12763444
] 

Hudson commented on ZOOKEEPER-542:
----------------------------------

Integrated in ZooKeeper-trunk #491 (See [http://hudson.zones.apache.org/hudson/job/ZooKeeper-trunk/491/])
    . c-client can spin when server unresponsive (Christian Wiedmann via mahadev)


> c-client can spin when server unresponsive
> ------------------------------------------
>
>                 Key: ZOOKEEPER-542
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-542
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: c client
>    Affects Versions: 3.2.0, 3.2.1
>            Reporter: Christian Wiedmann
>            Assignee: Christian Wiedmann
>             Fix For: 3.3.0
>
>         Attachments: ZOOKEEPER-542.patch, ZOOKEEPER-542.patch
>
>
> Due to a mismatch between zookeeper_interest() and zookeeper_process(), when the zookeeper
server is unresponsive the client can spin when reconnecting to the server.
> In particular, zookeeper_interest() adds ZOOKEEPER_WRITE whenever there is data to be
sent, but flush_send_queue() only writes the data if the state is ZOO_CONNECTED_STATE.  When
in ZOO_ASSOCIATING_STATE, this results in spinning.
> This probably doesn't affect production, but I had a runaway process in a development
deployment that caused performance issues on the node.  This is easy to reproduce in a single
node environment by doing a kill -STOP on the server and waiting for the session timeout.
> Patch to be added.

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