[GitHub] [couchdb] kocolosk opened a new issue #2223: Use `\xff/metadataVersion` for caching in 6.1+

[GitBox <gi...@apache.org>]

kocolosk opened a new issue #2223: Use `\xff/metadataVersion` for caching in 6.1+
URL: https://github.com/apache/couchdb/issues/2223
 
 
   [NOTE]: # ( ^^ Provide a general summary of the request in the title above. ^^ )
   
   ## Summary
   
   FoundationDB 6.1 introduces a new feature designed to help layers cache frequently-accessed metadata:
   
   https://forums.foundationdb.org/t/a-new-tool-for-managing-layer-metadata/1191
   
   We have been designing our CouchDB layer to use this new feature, but we still have various 6.0 environments floating around in development so we've got a placeholder key there instead:
   
   https://github.com/apache/couchdb/blob/ff2cdb84f639ea26ac7b1ad85abb0a49c5141c74/src/fabric/include/fabric2.hrl#L17-L26
   
   I'm filing this issue so we don't forget to switch it over.
   
   ## Desired Behaviour
   
   FoundationDB should deliver the metadataVersion key as part of starting a transaction so we don't need a second roundtrip for it.
   
   ## Additional context
   
   Blocked until all our development and testing environments are upgraded to FoundationDB 6.1 or greater.

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