adamkennedy commented on pull request #28376:
URL: https://github.com/apache/spark/pull/28376#issuecomment-620914526


   @viirya The embedded Hadoop could easily be incompatible with the cluster. 
But then the Spark version could be incompatible with the cluster's Hadoop as 
well. If the Spark chooses to bundle Hadoop libraries, then at least we know 
that works, and then the onus is on the Spark distribution to provide a 
different-but-compatible version, and the failure is only a failure for that 
one job. But at least the Spark provider gets an opportunity to provide 
something working, as opposed to the situation where different parts of the two 
different distributions end up cross-loading each other unexpectedly.


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