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https://issues.apache.org/jira/browse/ZOOKEEPER-1997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076767#comment-14076767
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Marshall McMullen commented on ZOOKEEPER-1997:
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With reconfig you still cannot grow from standalone to quorum mode. There are
many many use cases for the standalone mode -- most notable for embedded unit
tests or for non-HA clusters which are use for simulations or test environments
where we don't need quorum mode.
> Why is there a standalone mode
> ------------------------------
>
> Key: ZOOKEEPER-1997
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1997
> Project: ZooKeeper
> Issue Type: Bug
> Reporter: Hongchao Deng
>
> It seems there is a special standalone mode.
> With the coming of reconfig, this doesn't make any sense.
> A single server can also be configured later to add more servers.
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