thinker0 commented on PR #3830:
URL: https://github.com/apache/incubator-heron/pull/3830#issuecomment-1143585416

   1. If zookeeper is used, Race Condition occurs at the same time because part 
[Link](https://github.com/apache/incubator-heron/pull/3830/files#diff-29e7366069fde10ea907fccddae5506e19a2d8dcaa5f515ce417fec4957e10ffR604-R631)
 is executed at the same time. 
   2. There are cases where Topology is registered as a duplicate. A lock was 
used to remove the part where the race condition occurred. 
[Link](https://github.com/apache/incubator-heron/pull/3830/files#diff-08d60d80f8e06cd2706c6b1ac3e791e2a57e67178f420d89d69780969bc8eda9R131-R146)


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