LiuGuH opened a new pull request, #6414:
URL: https://github.com/apache/hadoop/pull/6414
…ateid is always delayed with Active Namenode for a period of time
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### Description of PR
Now when Observer NN is used, if the stateid is delayed , the rpcServer
will be requeued into callqueue. If EditLogTailer is broken or something else
wrong , the call will be requeued again and again.
So Observer should throw ObserverRetryOnActiveException if stateid is
always delayed with Active Namenode for a configured time.
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