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https://issues.apache.org/jira/browse/COUCHDB-3288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183162#comment-16183162
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ASF subversion and git services commented on COUCHDB-3288:
----------------------------------------------------------

Commit 1c5e136b34042b1da11fae156542468a6fd28f41 in couchdb's branch 
refs/heads/COUCHDB-3288-mixed-cluster-upgrade from [~paul.joseph.davis]
[ https://gitbox.apache.org/repos/asf?p=couchdb.git;h=1c5e136 ]

Avoid bad match on really old databases

COUCHDB-3288


> Allow mixed clusters for PSE deployment
> ---------------------------------------
>
>                 Key: COUCHDB-3288
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-3288
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Paul Joseph Davis
>
> To enable a mixed cluster upgrade (i.e., rolling reboot upgrade) we need to 
> do some preparatory work to remove access to the #db{} record since this 
> record is shared between nodes.
> This work is all straight forward and just involves changing things like 
> Db#db.main_pid to couch_db:get_main_pid(Db) or similar.



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