jiajunwang edited a comment 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 2 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. The later one may result in a failure in deleting the instance node. 
In either case, there should be an error log recorded for the initial drop 
instance call failure.
   Could you please check the earlier log and see what's in that original error 
message to confirm?
   
   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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