jiangphcn commented on issue #1186: [WIP] Clustered purge mixed cluster upgrade
URL: https://github.com/apache/couchdb/pull/1186#issuecomment-370790664
   Thanks Paul @davisp for your reply. I understand. For completeness, we need 
to consider downgrade when there is purge request between pre-CP and CP. 
However, only with CP build, the clustered purge API is available. Before that, 
there is less possibility to have purge request. So downgrade may not be effort 
we should focus on.
   Regarding the second point "unused/idle indexes after upgrade", as you know, 
we have two methods to trigger init/update of secondary index, search index and 
geo index.
   - issue search request and trigger update of index
   - use `ken` or similar approach to automatically trigger init/update of index
   If there is unused/idle index, what about leveraging `ken` or similar 
approach to trigger index o run an initial step? Thus, if there is update on 
database document, ken will trigger init/update of index, thus the local purge 
document will be created so that purge requests will not be compacted before a 
index see them.

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