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https://issues.apache.org/jira/browse/ZOOKEEPER-769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864953#action_12864953
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Henry Robinson commented on ZOOKEEPER-769:
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Sergey -
In the cfg files for nodes 3 and 5, did you include the following line?
peerType=observer
See http://hadoop.apache.org/zookeeper/docs/r3.3.0/zookeeperObservers.html for
details. The observer log contains this line:
2010-05-06 22:46:00,876 - INFO
[QuorumPeer:/0:0:0:0:0:0:0:0:2183:quorump...@642] - FOLLOWING
which is a big red flag because observers should never adopt the FOLLOWING
state.
If I don't have that line I can reproduce your issue. If I add it, the
observers work as expected. Can you check your cfg files?
cheers,
Henry
> 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
> Fix For: 3.3.0
>
> Attachments: follower.log, leader.log, observer.log, 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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