yucai commented on issue #19788: [SPARK-9853][Core] Optimize shuffle fetch of 
contiguous partition IDs
URL: https://github.com/apache/spark/pull/19788#issuecomment-453375449
 
 
   Thanks @cloud-fan 's help, we discussed a new solution to make both client 
and server can work with the previous version (backward compatible), which 
means the user can upgrade spark client or external shuffle service separately. 
But AE supported Spark and external shuffle service will show better 
performance.

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