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  • Application thread: user thread on which all Consumer API requests and callback handlers are executed.

  • Network thread: client-internal thread on which network I/O related to heartbeat, coordinator, and rebalance is executed.

  • Event handler: A communication interface between the application thread and network thread

  • Application event queue: sends events to the network I/O thread from the application thread

  • Background event queue: sends events from the network thread to the application thread

  • Application event processor: 

We will discuss the strategy for handling event results in the following section. In short, for async APIs like commitAsync(), CompletableFuture will be used to notify the completion of the events.

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