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https://issues.apache.org/jira/browse/ZOOKEEPER-2476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380371#comment-15380371
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Jordan Zimmerman commented on ZOOKEEPER-2476:
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In this case we have 1 participant and 1 observer. I can't think of a reason
why the upgrade shouldn't be allowed. The 1 existing server can manage the
entire "quorum". The observer being upgraded cannot possibly be out of sync.
> Not possible to upgrade via reconfig a Participant+Observer cluster to a
> Participant+Participant cluster
> --------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2476
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2476
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum, server
> Affects Versions: 3.5.1
> Reporter: Jordan Zimmerman
> Assignee: Alexander Shraer
> Priority: Critical
> Attachments: ZOOKEEPER-2476.patch
>
>
> Contrary to the documentation, it is not possible to upgrade via reconfig a
> Participant+Observer cluster to a Participant+Participant cluster.
> KeeperException.NewConfigNoQuorum is thrown instead.
> PrepRequestProcessor should recognize this special case and let it pass. Test
> will be enclosed shortly. I'll work on a fix as well, but I imagine that
> [~shralex] will want to look at it.
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