how to know what happen between tasks launch

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how to know what happen between tasks launch

lk_spark
hi,all:
   In my case, there is two very quick task in one stage , but there is a very long time between the two task launch,I don't know what happen,and how to find out the reason.
   I'm useing spark on yarn client model , which the client is not on one of yarn cluster host.
   thanks for help !





 



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