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https://issues.apache.org/jira/browse/COUCHDB-3288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983683#comment-15983683
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ASF subversion and git services commented on COUCHDB-3288:
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Commit 46fae003c9eb5d273bfe90e0570de0043e0412ec in couchdb's branch
refs/heads/COUCHDB-3287-pluggable-storage-engines from [~paul.joseph.davis]
[ https://gitbox.apache.org/repos/asf?p=couchdb.git;h=46fae00 ]
Add clause for mixed cluster upgrades
A mixed cluster (i.e., during a rolling reboot) will want to include
this commit in a release before deploying PSE code to avoid spurious
erros during the upgrade.
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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