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https://issues.apache.org/jira/browse/ZOOKEEPER-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Shraer resolved ZOOKEEPER-1726.
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Resolution: Duplicate
> No way to dynamically go from 1 ZK server -> 2 ZK servers?
> ----------------------------------------------------------
>
> Key: ZOOKEEPER-1726
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1726
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.5.0
> Reporter: Justin SB
>
> The dynamic reconfiguration feature is great. But it doesn't seem to be
> possible to go from 1 server to 2 servers (1 server + 1 observer). When
> there's only one server, ZK automatically starts in single server mode; when
> in single server mode trying to add a server causes a class cast exception
> because the server is a ZooKeeperServer, not a LeaderZooKeeperServer.
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