Josh Rosen created SPARK-8460:
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             Summary: Distinguish between shuffle and non-shuffle spills in 
metrics
                 Key: SPARK-8460
                 URL: https://issues.apache.org/jira/browse/SPARK-8460
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Josh Rosen


Some Spark operators may spill to disk even if they are not performing a 
shuffle (for instance, an external aggregation).  We should consider whether we 
want to distinguish between shuffle- and non-shuffle spill or whether we want 
to just update the web UI metrics descriptions to make it more clear that the 
spill may include non-shuffle spills as well.

/cc [~kayousterhout]



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