[GitHub] jerrypeng opened a new issue #2720: Improving stop and start function instances

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jerrypeng opened a new issue #2720: Improving stop and start function instances
URL: https://github.com/apache/pulsar/issues/2720
 
 
   Currently, when a user submits a request to stop or start a function instance, the worker that receives the request attempt to redirect the stop or start request to the actual worker running the function instance.  I don't think this is a good mechanism for this and it is prone to failures.  What is happening here is a state change, however the state change isn't persisted, thus when failures happen this state change is lost.  For example, if the worker running the function instance has stopped the instance but then the worker itself crashes. Upon restarting, the worker will start the function instance in the incorrect state.
   
   The better mechanism for doing this add a field FunctionMetaData, to indicate the state of the function instance.  And when the worker that is assigned/running the function instances reads from the FunctionMetaData topic gets an update of the state, it can act accordingly.  This will also persist across failures and functions instances will get restarted in the correct state.
   
   @rdhabalia can you provide feedback?
   

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