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1. Sometimes, user will want to close a producer wiithin a bounded time to avoid blocking on producer.close() for too long.
2. One specific use case of 1) is that in some scenarios, user will want to close the produce immediately and fail all the unsent messages in RecordAccumulator. Some examples are:
   1. In mirror maker, if a send failed, we don't want to continue sending messages in RecordAccumulator to avoid reordering.
   2. For people who are using deployment tools, a service is expected to stop in given time. In that case people might want to have a bounded time to shutdown producer.

So we need to provide an interface that allow user to choose to close producer in which way.

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