Github user squito commented on the issue:

    https://github.com/apache/spark/pull/21698
  
    > What if the user does't provide a distributed file system path? E.g., you 
can read from Kafka and write them back to Kafka and such workloads don't need 
a distributed file system in standalone mode.
    
    yeah that is a good point.  I think we want a solution which is correct 
without checkpointing (eg. always sort), but perhaps can leverage checkpointing 
when possible to avoid the overhead.


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