Jackie-Jiang opened a new pull request #4089: In HelixBrokerStarter, allow custom cluster change handlers URL: https://github.com/apache/incubator-pinot/pull/4089 Motivation: all cluster change listeners should be added through the ClusterChangeMediater in order to perform dedup and proactive check Add ClusterChangeHandler interface Add methods in HelixBrokerStarter to allow custom cluster change handlers to be plugged in Split the responsibility of helix managers on broker side - Spectator: handles the custom change listeners, properties read/write - Participant: handles Helix functionality such as state transitions and messages
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