[jira] [Created] (HELIX-281) Need to optimize the scenario that multiple Message change can stop external view update

["Shi Lu (JIRA)" <ji...@apache.org>]

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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