Shi Lu created HELIX-281:
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Summary: Need to optimize the scenario that multiple Message
change can stop external view update
Key: HELIX-281
URL: https://issues.apache.org/jira/browse/HELIX-281
Project: Apache Helix
Issue Type: Bug
Reporter: Shi Lu
Assignee: Zhen Zhang
Priority: Critical
We have seen the following behavior in the relay cluster startup:
controller is full time doing onMessage() callback, although all the current
state has already been updated. As all state transitions are done, all the
Message update callback in controller side becomes NO-OP but stops the current
state from being updated. As there are so many onMessage change callbacks,
ExternalView does not get updated in hours. This is going to be a blocking perf
issue in big clusters.
One work-around is to switch the controller if the current controller is in
this Message update loop.
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