kaisun2000 opened a new issue #930: CallbackHandler would leak watcher in Zookeeper server if session expires happens URL: https://github.com/apache/helix/issues/930 TestZkCallbackHandlerLeak#testRemoveUserCbHandlerOnPathRemoval illustrate this case. Basically after newSession, fireAllEvents would trigger all watches in ZkClient (but not in Zookeeper as for newSession, it has no watch for this session). Here, for path of CallbackHandler that get removed, the path and all the resources underlying would be installed as "exists" watch in native zookeeper client/server. This kind of leak would be gone if session expire another time.
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