[jira] Updated: (ZOOKEEPER-710) permanent ZSESSIONMOVED error after client app reconnects to zookeeper cluster

["Lukasz Osipiuk (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lukasz Osipiuk updated ZOOKEEPER-710:
-------------------------------------

    Attachment: zookeeper-node3.log.2010-03-16.gz
                zookeeper-node2.log.2010-03-16.gz

> permanent ZSESSIONMOVED error after client app reconnects to zookeeper cluster
> ------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-710
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-710
>             Project: Zookeeper
>          Issue Type: Bug
>         Environment: debian lenny; ia64; xen virtualization
>            Reporter: Lukasz Osipiuk
>         Attachments: app1.log.2010-03-16.gz, zookeeper-node1.log.2010-03-16.gz, zookeeper-node2.log.2010-03-16.gz, zookeeper-node3.log.2010-03-16.gz
>
>
> Originally problem was described on Users mailing list starting with this [post|http://mail-archives.apache.org/mod_mbox/hadoop-zookeeper-user/201003.mbox/<3b...@mail.gmail.com>].
> Below I restate it in more organized form.
> We occasionally (few times a day) observe that our client application disconnects from Zookeeper cluster.
> Application is written in C++ and we are using libzookeeper_mt library. In version 3.2.2.
> The disconnects we are observing are probably related to some problems with our network infrastructure - we are observing periods with great packet loss between machines in our DC. 
> Sometimes after client application (i.e. zookeeper library) reconnects to zookeeper cluster we are observing that all subsequent requests return ZSESSIONMOVED error. Restarting client app helps - we always pass 0 as clientid to zookeeper_init function so old session is not reused.
> On 16-03-2010 we observed few occurences of problem. Example ones:
> - 22:08; client IP 10.1.112.60 (app1)
> - 14:21; client IP 10.1.112.61 (app2)
> I attach logs of cluster and application nodes (only stuff concerining zookeeper):
> - zookeeper-node1.log.2010-03-16.gz
> - zookeeper-node2.log.2010-03-16.gz
> - zookeeper-node3.log.2010-03-16.gz
> - app1.log.2010-03-16.gz
> - app2.log.2010-03-16.gz
> I also made some analysis of case at 22:08:
> - Network glitch which resulted in problem occurred at about 22:08.
> - From what I see since 17:48 node2 was the leader and it did not
> change later yesterday.
> - Client was connected to node2 since 17:50
> - At around 22:09 client tried to connect to every node (1,2,3).
> Connections to node1 and node3 were closed
>  with exception "Exception causing close of session 0x22767e1c9630000
> due to java.io.IOException: Read error".
>  Connection to node2 stood alive.
> - All subsequent operations were refused with ZSESSIONMOVED error.
> Error visible both on client and on server side.

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