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  • Worker (stream worker): unit of streaming processor on thread level. It is equivalent to stream main consumer currently, and we later sections will explain why we want to separate out a new definition.
  • Instance (stream instance): the KStream instance serving as container of stream workers. This could suggest a physical host or a kubernetes pod.
  • Leaner task: a special task that gets assigned to one stream instance to restore a current active task state from another instance.

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