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Date: Fri, 19 Mar 2010 05:43:27 +0000 (UTC)
From: "Benjamin Reed (JIRA)" <jira@apache.org>
To: zookeeper-dev@hadoop.apache.org
Subject: [jira] Updated: (ZOOKEEPER-710) permanent ZSESSIONMOVED error after
 client app reconnects to zookeeper cluster
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     [ https://issues.apache.org/jira/browse/ZOOKEEPER-710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Reed updated ZOOKEEPER-710:
------------------------------------

    Hadoop Flags: [Reviewed]

+1 great work pat! and thanx Lukasz for identifying this failure condition.

> 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
>          Components: server
>    Affects Versions: 3.2.2
>         Environment: debian lenny; ia64; xen virtualization
>            Reporter: Lukasz Osipiuk
>            Assignee: Patrick Hunt
>            Priority: Blocker
>             Fix For: 3.2.3, 3.3.0
>
>         Attachments: app1.log.2010-03-16.gz, app2.log.2010-03-16.gz, ZOOKEEPER-710_3.3.patch, 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/<3b910d891003160743k38e2e7c9y830b182d88396d55@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); sessionID 0x22767e1c9630000
> - 14:21; client IP 10.1.112.61 (app2); sessionID 0x324dcc1ba580085
> I attach logs of cluster and application nodes (only stuff concerining zookeeper):
> - [^zookeeper-node1.log.2010-03-16.gz] - logs of zookeepr cluster node 1 10.1.112.62
> - [^zookeeper-node2.log.2010-03-16.gz] - logs of zookeepr cluster node 2 10.1.112.63
> - [^zookeeper-node3.log.2010-03-16.gz] - logs of zookeepr cluster node 3 10.1.112.64
> - [^app1.log.2010-03-16.gz] - application logs of app1 10.1.112.60
> - [^app2.log.2010-03-16.gz] - application logs of app2 10.1.112.61
> 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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