jiajunwang commented on issue #331: CallbackHandler async re-subscribe watcher can potentially miss events URL: https://github.com/apache/helix/issues/331#issuecomment-513437251 The re-subscribe does not rely on the async logic. It is by default done in the ZkClient. The real problem is the race condition when updating the Helix cache. This prevents the controller from re-calculating the new mapping. Will update with more detail next week.
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