v.23.8Experimental Feature

Enable Parallel Reading from Replicas in Distributed Tables

Enable parallel reading from replicas over distributed table. Related to #49708. #53005 (Igor Nikonov).
Enables parallel reading from replicas when querying DISTRIBUTED tables in ClickHouse.

Why it matters

This feature improves query performance and fault tolerance by allowing simultaneous data retrieval from multiple replicas of a distributed table. It reduces latency and balances load across replicas, enhancing data availability and query efficiency.

How to use it

To use this feature, ensure your DISTRIBUTED table is configured with replicas. The system will automatically perform parallel reading from these replicas when executing queries, with no changes needed to the query syntax.