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https://issues.apache.org/jira/browse/COUCHDB-3288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164745#comment-16164745
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ASF subversion and git services commented on COUCHDB-3288:
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Commit 44880dc0b4d7d09923e1136d8f7aa4672f712905 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=44880dc ]
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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