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From ermouth <>
Subject Re: [DISCUSS] Node types in CouchDB 4.x
Date Tue, 19 Nov 2019 19:06:21 GMT
Isn’t it an approach used by Couchbase?


вт, 19 нояб. 2019 г. в 20:11, Nick Vatamaniuc <>:

> Hi everyone,
> I'd like to discuss the ability to have heterogeneous nodes types in
> CouchDB 4.
> In CouchDB 2 and 3 the nodes in the cluster are usually similar, and
> functionality is uniformly distributed amongst the nodes. That is all
> nodes can accept HTTP requests, run replication jobs, build indices
> etc. They are typically deployed such that they similar hardware
> requirements.
> In an FDB-based CouchDB 4, CRUD operations, on the Erlang nodes,
> wouldn't require as many resources, so it would be possible to have a
> set of nodes, performing just CRUD operations that are much smaller
> than the equivalent CouchDB 2 and 3 nodes. However, indexing and
> replication might still require heavy resource usage.
> So the proposal is to add configuration to CouchDB 4 to allow some
> nodes to perform only  a subset of their current functionality. For
> example, it would be possible to have 6 1-CPU nodes with 512MB
> accepting API requests, and, 2 4-CPU node with 4GB of memory each
> running replication and indexing jobs only, or any other such
> combinations. By default, with any extra configuration, the behavior
> would stay as is today -- all nodes will run all the functionality.
> I created an RFC exploring how it might look like:
> There is a comment there how it could be implemented. So far it looks
> like it could be fairly trivial  since it would build on the
> couch_jobs work already in place.
> What does everyone think?
> Cheers,
> -Nick

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