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https://issues.apache.org/jira/browse/ZOOKEEPER-1692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15961749#comment-15961749
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Atri Sharma commented on ZOOKEEPER-1692:
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Was this ever implemented? [~thawan] Can I help with this?
> Add support for single member ensemble
> --------------------------------------
>
> Key: ZOOKEEPER-1692
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1692
> Project: ZooKeeper
> Issue Type: Improvement
> Components: quorum
> Affects Versions: 3.4.0
> Reporter: Thawan Kooburat
> Assignee: Thawan Kooburat
> Priority: Minor
>
> In the past, we ran into problem where quorum could not be formed multiple
> times. It take a while to investigate the root cause and fix the problem.
> Our current solution is to make it possible to run a quorum with a single
> member in it. Unlike standalone mode, it has to run as LeaderZooKeeper
> server, so that the observers can connect to it.
> This will allow the operator to use this workaround to bring back the
> ensemble quickly while investigating the problem in background.
> The main problem here is to allow the observers to connect with the leader
> when the quorum size is reduced to one. We don't want to update the (static)
> configuration on the observer since it require server restart. We are
> thinking of allowing the observer to connect to any participant which
> declared that it is the leader without running the leader election algorithm
> (because it won't have enough votes).
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