nickva commented on issue #4639:
URL: https://github.com/apache/couchdb/issues/4639#issuecomment-1587824167

   > Oh and finally, do you have any suggestions as to how I can replicate from 
the outdated couchdb instance when faced with the timeout request on the 
_ensure_full_commit endpoint? Thank you so much!
   
   You can try disable bulk_get usage, increase the timeout, and reduce the 
number of workers a bit. 200 concurrent workers may be a bit too much for the 
endpoint to handle? Try reducing their number to say 10 and see what it does. 
Try reducing your batch size as well a bit.
   
   Replicating in general implies being able to update the _local checkpoint 
document on the source endpoint. If the source endpoint doesn't allow that, 
depending how that's implemented it may manifest as a timeout (if they just 
close the connection and don't respond). In that case you can try disable 
checkpointing altogether with: 
https://docs.couchdb.org/en/stable/config/replicator.html#replicator/use_checkpoints
 As the option implies this would disable checkpointing so on failure, it will 
retry to scan all the docs again next time it tries to run.


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