[GitHub] [kafka] guozhangwang commented on pull request #13270: KAFKA-14729: The kafakConsumer pollForFetches(timer) method takes up a lot of cpu due to the abnormal exit of the heartbeat thread

["guozhangwang (via GitHub)" <gi...@apache.org>]

guozhangwang commented on PR #13270:
URL: https://github.com/apache/kafka/pull/13270#issuecomment-1434906588

   This is an interesting find, thanks @RivenSun2 . In general I think if the background thread dies for whatever the reason we should consider the following actions in precedence:
   
   1) Make sure the consumer now falls into an abnormal state which would not return data, and would not try to tie up the caller thread. This is also for notifying the user.
   
   2) Try to "selfheal" by re-creating the thread (we do not need to do it in this PR, just laying out the ground here), in order to bring the consumer back to normal state.
   
   3) If we cannot selfheal the consumer and it simply becomes useless, let the consumer to throw an exception for any API calls so that the caller thread would then go ahead and recreate a brand new consumer.


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