max_distributed_connections
The maximum number of simultaneous connections with remote servers for distributed processing of a single query to a single Distributed table. We recommend setting a value no less than the number of servers in the cluster. The following parameters are only used when creating Distributed tables (and when launching a server), so there is no reason to change them at runtime.max_distributed_depth
Limits the maximum depth of recursive queries for Distributed tables. If the value is exceeded, the server throws an exception. Possible values:- Positive integer.
- 0 — Unlimited depth.