Critical Description
If a coordinator disconnect is observed in the heartbeat thread, it can cause a pending offset commit to be cancelled just before the foreground thread begins waiting on its response in poll(). Since the poll timeout is Long.MAX_VALUE, this will cause the consumer to effectively hang until some other network event causes the poll() to return. We try to protect this case with a poll condition on the future, but this isn't bulletproof since the future can be completed outside of the lock.
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