[jira] Reopened: (ZOOKEEPER-769) Leader can treat observers as quorum members

["Patrick Hunt (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Patrick Hunt reopened ZOOKEEPER-769:
------------------------------------


reopening to improve the config parsing

> Leader can treat observers as quorum members
> --------------------------------------------
>
>                 Key: ZOOKEEPER-769
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-769
>             Project: Zookeeper
>          Issue Type: Bug
>    Affects Versions: 3.3.0
>         Environment: Ubuntu Karmic x64
>            Reporter: Sergey Doroshenko
>            Assignee: Sergey Doroshenko
>             Fix For: 3.4.0
>
>         Attachments: follower.log, leader.log, observer.log, warning.patch, zoo1.cfg
>
>
> In short: it seems leader can treat observers as quorum members.
> Steps to repro:
> 1. Server configuration: 3 voters, 2 observers (attached).
> 2. Bring up 2 voters and one observer. It's enough for quorum.
> 3. Shut down the one from the quorum who is the follower.
> As I understand, expected result is that leader will start a new election round so that to regain quorum.
> But the real situation is that it just says goodbye to that follower, and is still operable. (When I'm shutting down 3rd one -- observer -- leader starts trying to regain a quorum).
> (Expectedly, if on step 3 we shut down the leader, not the follower, remaining follower starta new leader election, as it should be).

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