Which of the following components is incorrect?

Question

Options

• ADN (DataNode): The data node relies on a powerful kernel to efficiently and stably process
• BCM (ClusterManager); Global clock service, distributed global transaction consistency guarantee
• CCN (CoordinatorNode); Transparent application access supports high-concurrency and complex
• DOM (Operation &Management): Centralized management of multiple nodes, worry-free operation

• A
  5% (2)
• B
  74% (28)
• C
  16% (6)
• D
  5% (2)

Explanation

Option B is incorrect because the description attributes "global clock service" and "distributed global transaction consistency guarantee" to the CM (ClusterManager), but those functions belong to the GTM (Global Transaction Manager), which is a separate component. The ClusterManager's actual role is to monitor node health, manage cluster state, and handle failover - not to coordinate distributed timestamps or transaction ordering.

Option A is correct: DataNodes do rely on robust kernel-level processing to handle storage and compute operations efficiently. Option C is correct: CoordinatorNodes act as the query entry point, enabling transparent access for applications and supporting high-concurrency workloads. Option D is correct: OM provides centralized administration across multiple nodes, simplifying cluster operations and maintenance.

Memory tip: Think of CM as a "health watcher" that keeps the cluster alive, and GTM as the "timekeeper" that synchronizes transactions. When an option swaps these roles, the description is wrong. If a choice mentions clocks or global transaction order, ask yourself whether it names GTM rather than CM.

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