[GitHub] [couchdb] nickva commented on pull request #2952: Prototype/fdb layer db version as vstamps

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

nickva commented on pull request #2952:
URL: https://github.com/apache/couchdb/pull/2952#issuecomment-645547070


   Previously, when the md version was stale we should have only revalidated each db_version (a single key read) to check that particular db hasn't changed. And if it hasn't, we would re-insert it into the cache with the new md version.
   
   https://github.com/apache/couchdb/blob/prototype/fdb-layer/src/fabric/src/fabric2_fdb.erl#L1873-L1879
   
   All the subsequent requests should then get an updated db handle with the new md version, which they'll see as current and not do the extra db version key read.
   
   But we shouldn't have fully reopened the db if a particular db's version hasn't changed.


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