About the exception "Received LaunchTask command but executor was null"

Wed, 02 Mar 2016 18:44:50 -0800 

Hi, all:
     Sometimes task will fail with exception "About the exception "Received 
LaunchTask command but executor was null",  and I find it is a common problem:
     https://issues.apache.org/jira/browse/SPARK-13112
     https://issues.apache.org/jira/browse/SPARK-13060
     
     I have a question that why should CoarseGrainedExecutorBackend wait for 
the response of driver? Can we initialize executor in the onStart function 
after the request to driver? 
     If CoarseGrainedExecutorBackend receive messages like 'LaunchTask' or 
'KillTask' which means that it is registered sucessfully.

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