tophe opened a new issue, #4385:
URL: https://github.com/apache/couchdb/issues/4385

   [NOTE]: # ( ^^ Provide a general summary of the issue in the title above. ^^ 
)
   
   ## Description
   Hello, since the upgrade in v3.3.1, I see that when a server restart, all 
replications restart from scatch.
   I don't know if it is a new functionality, but when you have 10 replications 
with 20M records, the server become useless for many many hours, the 
replications process use all the server io, and the server become unresponsive.
   
   [NOTE]: # ( Describe the problem you're encountering. )
   [TIP]:  # ( Do NOT give us access or passwords to your actual CouchDB! )
   
   ## Steps to Reproduce
   setup a replication with many records, complete it, restart the server.
   
   [NOTE]: # ( Include commands to reproduce, if possible. curl is preferred. )
   
   ## Expected Behaviour
   Replications shouldn't restart from the begining, but from their latest 
positions. So the server is available as soon as it restart.
   pausing and starting and reseting replication through the api, should be a 
great help. 
   
   [NOTE]: # ( Tell us what you expected to happen. )
   
   ## Your Environment
   docker official image.
   
   [TIP]:  # ( Include as many relevant details about your environment as 
possible. )
   [TIP]:  # ( You can paste the output of curl http://YOUR-COUCHDB:5984/ here. 
)
   
   * CouchDB version used: 3.3.1
   * Browser name and version: firefox
   * Operating system and version: debian bulleyes
   
   ## Additional Context
   
   [TIP]:  # ( Add any other context about the problem here. )
   


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