[GitHub] adrienverge opened a new pull request #338: Fix ambiguity in documentation on shards and replicas

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

adrienverge opened a new pull request #338: Fix ambiguity in documentation on shards and replicas
URL: https://github.com/apache/couchdb-documentation/pull/338
 
 
   The doc said:
   > If you have 4 shards, that means that you can have at most 4 nodes.
   
   But at other places it states:
   > For systems with lots of small, infrequently accessed databases, or
   > for servers with fewer CPU cores, consider reducing this value to
   > ``1`` or ``2``.
   
   and:
   > In a default 3-node cluster, each node would receive 8 shards.
   
   From my understanding, the number of *shards* can be anything, and even
   `q=1` will not alter safety of data. Only `n` can. If I understand
   correctly:
   - If you have 4 *copies* of a shard (`n=4`), that means that you can
     have at most 4 nodes.
   - The number of nodes is not impacted by the number of shards (`q`).
   - You can have safe clusters with `n=3`, `q=1` (2 nodes can be down).
   
   So this commit tries to make the doc clearer.
   

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