davisp commented on issue #1186: [WIP] Clustered purge mixed cluster upgrade
URL: https://github.com/apache/couchdb/pull/1186#issuecomment-370492585
 
 
   I've not got anything good no. Other than I'm starting to really really 
wanting to avoid the possibility of downgrading. The one thing that does make 
things a bit easier is that most databases won't already have purge information 
since its not available through the clustered API and doesn't appear to be an 
API most people use normally.
   
   However the thing that's mostly worrying me now is what to do about 
unused/idle indexes after upgrade in terms of both a) can we auto-create _local 
docs for them or b) can we force them all to run an initial step. The fear 
being that if we upgrade and allow for purging when an index exists but is 
unused it seems possible to have an invalid index laying around (i.e., if we 
compact purge requests such that a index never sees them).

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