Skip Unavailable Replicas in Parallel Distributed INSERT SELECT

Why it matters

This feature addresses the issue where parallel distributed INSERT SELECT queries fail or hang if some replicas are unavailable. By skipping these unreachable replicas, the operation becomes more resilient and ensures continuous data insertion without interruption.

How to use it

When executing a parallel distributed INSERT SELECT, ClickHouse will automatically skip replicas that are unavailable. No additional configuration is required to enable this behavior.