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From "Ben Sherman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2783) follower disconnects and cannot reconnect
Date Sat, 13 May 2017 00:47:04 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ben Sherman updated ZOOKEEPER-2783:
-----------------------------------
    Attachment: fail5.log
                fail3.log

> follower disconnects and cannot reconnect
> -----------------------------------------
>
>                 Key: ZOOKEEPER-2783
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2783
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: leaderElection
>    Affects Versions: 3.4.10
>         Environment: centos 7, AWS EC2
>            Reporter: Ben Sherman
>         Attachments: fail3.log, fail5.log
>
>
> We have a 5 node cluster running 3.4.10 we saw this in .8 and .9 as well), and sometimes,
a node gets a read timeout, drops all the connections and tries to re-establish itself to
the quorum.  It can usually do this in a few seconds, but last night it took almost 15 minutes
to reconnect.
> These are 5 servers in AWS, and we've tried tuning the timeouts, but the are exceeding
any reasonable timeout and still failing.
> In the attached logs, 5 is a follower, 3 is the leader.  5 loses connectivity at 11:21:34.
 3 sees the disconnect at the same moment.
> 5 tries to re-establish the quorum, but cannot do it until the connections to the other
servers expire at 11:37:02.  After the connections are re-established, 5 connects immediately.
> At 11:41:08, the operator restarted the server, and it reconnected normally.
> I suspect there is a problem with stale connections to the rest of the quorum - the other
services on this box were fine (monitoring, puppet) and able to establish new connections
with no problems.
> I posed this problem to the zookeeper-users list and was asked to open a ticket.



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