Which statement about worker (work process), Executor (thread), and task (task) is correct?

Question

Options

• AEach Executor (thread) can run a task (task)
• BEach Executor (thread) can run tasks (tasks) of different components (spout or bolt)
• CEach worker can run multiple Executors (threads)
• DEach worker can only run Executor (thread) for one topology

• A
  100% (49)

Explanation

All four statements describe the layered architecture of Apache Storm's execution model, and each is independently true.

Why all four are correct: In Storm, a worker is a JVM process dedicated to exactly one topology (D), and it hosts multiple executor threads (C). Each executor thread runs one or more tasks (A), which are the actual spout/bolt instances. Because a single worker can hold executors belonging to different spout or bolt components, executors in that worker collectively handle tasks across different component types (B) - though each individual executor is bound to one component type, a worker's executor pool spans the topology's components.

Why none are "wrong" distractors here: This is an "all of the above" question testing whether students mistakenly exclude any true statement. The common trap is thinking workers can serve multiple topologies (they cannot - D rules that out), or thinking executors can only hold one task (A clarifies they can hold many), causing students to second-guess individually correct options.

Memory tip: Think of it as a nesting doll - Topology → Worker (1 topology only) → Executors (many per worker, across components) → Tasks (many per executor). Each layer can hold multiples of the layer below it, except that a worker is locked to one topology.

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