nickva commented on issue #4448:
URL: https://github.com/apache/couchdb/issues/4448#issuecomment-1672184062

   Updated PR https://github.com/apache/couchdb/pull/4627 with a wip skeleton 
of a `couch_scanner` app.
   
   `couch_scanner` is an applications which knows how to scan 
databases/design_docs in the background, at a low rate, with periodic 
checkpointing. The idea, as discussed during the dev meeting a month or two 
ago, is to use it compare quickjs engine output with sm output and report 
discrepancies/incompatibilities as an extra safety for users to verify they can 
switch to the new js engine. Other uses could be to accumulate some 
cluster-wide states: total index sizes, some ddoc features (any docs using 
`lists` or `shows`) etc. 
   


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