jiajunwang commented on issue #683: Inconsistency in the nodes tracked 
URL: https://github.com/apache/helix/issues/683#issuecomment-575298525
 
 
   Thanks for reporting the issue. Since there are delete operations, it is 
possible that the config path delete succeeds but the instance path delete 
fails. It might be caused by a temporary ZK connection issue or a race 
condition, which results in a failure in deleting the instance node. In this 
case, there should be an error log related to the initial drop instance call.
   Could you please check the earlier log and see what's in that original error 
message?
   
   FYI, in our later version 0.8.4, we added a retry logic to resolve the 
possible race condition. 
https://github.com/apache/helix/commit/7cc2a830a72b162f6bbf29dcd446cc12ded60cd5

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