What are the Bolt interface methods?

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The prepare method is called when worker initializes the task.

The execute method is called every time a tuple comes in

Cleanup is actually only used in local mode (local mode), and it is difficult to ensure that this method is executed correctly every time in cluster mode (cluster mode).

The declearOutputFields method is used to determine the format of the output content stream only when a new topology is submitted to the server (equivalent to defining the name:value format for transferring stream between spout/bolt), and is not called during topology execution.

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