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https://issues.apache.org/jira/browse/ZOOKEEPER-2461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512847#comment-15512847
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Flavio Junqueira commented on ZOOKEEPER-2461:
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If we end up making any improvement here, let's not change the 3.4 branch.
> There is no difference between the observer and the participants in the
> leader election algorithm
> -------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2461
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2461
> Project: ZooKeeper
> Issue Type: Improvement
> Components: quorum
> Affects Versions: 3.5.0
> Reporter: Ryan Zhang
> Assignee: Ryan Zhang
> Fix For: 3.5.3, 3.6.0
>
>
> We have observed a case that when a leader machine crashes hard, non-voting
> learners take a long time to detect the new leader. After looking at the
> details more carefully, we identified one potential improvement (and one bug
> fixed in the 3.5).
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