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Posted to dev@zookeeper.apache.org by "Christian Wiedmann (JIRA)" <ji...@apache.org> on 2009/10/06 04:01:31 UTC
[jira] Updated: (ZOOKEEPER-542) c-client can spin when server
unresponsive
[ https://issues.apache.org/jira/browse/ZOOKEEPER-542?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Christian Wiedmann updated ZOOKEEPER-542:
-----------------------------------------
Attachment: ZOOKEEPER-542.patch
> 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
> Reporter: Christian Wiedmann
> Attachments: 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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