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https://issues.apache.org/jira/browse/COUCHDB-3288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162000#comment-16162000
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ASF subversion and git services commented on COUCHDB-3288:
----------------------------------------------------------

Commit b1994f786b48ea14cc65b95d2b42af703c37b2a6 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=b1994f7 ]

Move calculate_start_seq and owner_of

These functions were originally implemented in fabric_rpc.erl where they
really didn't belong. Moving them to couch_db.erl allows us to keep the
unit tests intact rather than just removing them now that the #db record
is being made private.

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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