dafu created HELIX-195:
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Summary: Race condition between FINALIZE callbacks and Zk Callbacks
Key: HELIX-195
URL: https://issues.apache.org/jira/browse/HELIX-195
Project: Apache Helix
Issue Type: Sub-task
Reporter: dafu
Assignee: dafu
FINALIZE callbacks are sent async via CallbackHandler#reset(), while Zk
callbacks are queued in ZkEventThread. It's possible that we are handling a
FINALIZE callback before all Zk callbacks are cleaned up. This creates race
conditions, for example, in zk session expiry, when a GenericController gets a
FINALIZE callback, it cleans up all listeners using ZkClient#unsubscribe(), but
Zk callbacks leftover in ZkEventThread comes later, and re-subscribe all
listeners, causing watcher leaking.
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