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https://issues.apache.org/jira/browse/RATIS-1247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17250923#comment-17250923
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Tsz-wo Sze commented on RATIS-1247:
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Your are right. Server1 should stop accepting write requests and wait for
server2 to catch up.
For rolling upgrade, we may add a new failover request so that the leader will
stop accepting new write requests and wait for a particular follower. The
clients will get a FailoverException so that they could use a different retry
policy for failover.
Then, failover will work even without priority. If there are priority,
failover must be from a low priority server to a higher or equal priority
server. What do you think?
> Support rolling upgrade and rollback
> ------------------------------------
>
> Key: RATIS-1247
> URL: https://issues.apache.org/jira/browse/RATIS-1247
> Project: Ratis
> Issue Type: Sub-task
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
>
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