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https://issues.apache.org/jira/browse/RATIS-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105563#comment-16105563
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Jing Zhao commented on RATIS-97:
--------------------------------

bq. Currently, we just start new servers with one configuration.

I guess this is the issue. We must let the new server understand it's new 
member so we should pass null configuration for these peers. Then these peers 
will start from {{startInitializing}}.

I will check your test case as well later.

> Leader may not have majority after setConfiguration
> ---------------------------------------------------
>
>                 Key: RATIS-97
>                 URL: https://issues.apache.org/jira/browse/RATIS-97
>             Project: Ratis
>          Issue Type: Bug
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>
> Here is an example: Suppose a group has 3 servers and one of them is the 
> leader.  Use setConfiguration to add 6 more servers.  The leader is still 
> running as a leader although it does not has majority anymore.  The 6 new 
> servers may elect a new leader among them.  Finally, there are two leaders in 
> the group.



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