在Cassandra的cassandra.yaml中设置ideal_consistency_level是否同时管控读写一致性？

Great question—this is a common point of confusion, so let's break it down clearly.

First, let's get straight what ideal_consistency_level in cassandra.yaml is not for: it has nothing to do with the read/write consistency levels your application or cqlsh uses for regular data operations.

Key Details to Clarify: #

• It doesn't set read/write consistency for client operations: This configuration controls the consistency level Cassandra uses for internal background tasks like repairs, cleanups, and node bootstrap processes. It’s focused on how Cassandra ensures data consistency between nodes during its own maintenance work—not your application’s user-facing queries.
• Client-side consistency levels remain independent: Your app or cqlsh will still use Cassandra’s default consistency levels (usually LOCAL_ONE for reads, LOCAL_QUORUM for writes, depending on your Cassandra version) unless you explicitly override them. You’ll still need to set these via cqlsh commands like CONSISTENCY LOCAL_QUORUM; or through your client driver’s configuration (e.g., setting consistency level in Java Driver code).
• Default value context: The default ideal_consistency_level is typically QUORUM, which ensures Cassandra’s internal operations meet a high consistency bar when syncing data across the cluster.

To sum it up: No, ideal_consistency_level does not set your read/write consistency levels, and you still need to configure those separately via cqlsh or your client if you want to deviate from defaults.

内容的提问来源于stack exchange，提问作者Victor A Chavez