[GitHub] [couchdb] alkmim opened a new issue #3865: Shard Rebalance Command

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

alkmim opened a new issue #3865:
URL: https://github.com/apache/couchdb/issues/3865


   ## Summary
   
   In the "Moving Shard" section of the documentation (https://docs.couchdb.org/en/stable/cluster/sharding.html#moving-a-shard), it says that "To balance the distribution of shards from existing databases, they must be moved manually."
   
   ## Desired Behaviour
   
   In a nutshell, the behavior would be pretty close to what is done on Gluster (See: https://docs.gluster.org/en/latest/Administrator-Guide/Managing-Volumes/#rebalancing-volumes)
   
   Whenever a node is added or removed from the cluster or whenever the  `q` or `n` parameter are changed, the user could run a command (or REST call) that would rebalance the entire cluster or a specific database. 
   
   In the perfect world, this command could be even called automatically whenever we add or remove a new node or change the `q` or `n` parameters. 
   
   ## Possible Solution
   
   Unfortunately, I am new to couchDB, so I am not familiar with the codebase. 
   
   ## Additional context
   
   A couple of reasons why this is important:
   
   - Moving shards manually is very error prone 
   - Moving shards manually is time consuming.
   - The current behavior can lead to data loss/inconsistencies if done incorrectly. 
   
   


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