Improved performance of parallel replicas by better utilizing the local replica and disabling reading with parallel replicas from non-replicated MergeTree tables by default.
Why it matters
This feature enhances the efficiency of query execution with parallel replicas by prioritizing the use of the local replica, which reduces latency and resource consumption. Additionally, it prevents the misuse of parallel replicas on non-replicated MergeTree tables, ensuring correctness and stability.How to use it
Users benefit from this improvement automatically as the system now better utilizes the local replica when using parallel replicas. Reading from parallel replicas on non-replicated MergeTree tables is disabled by default, requiring no additional configuration unless explicitly overridden.