Kay Ousterhout created SPARK-2384:
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             Summary: Add tooltips for shuffle write and scheduler delay in UI
                 Key: SPARK-2384
                 URL: https://issues.apache.org/jira/browse/SPARK-2384
             Project: Spark
          Issue Type: Improvement
          Components: Web UI
            Reporter: Kay Ousterhout
            Assignee: Kay Ousterhout
            Priority: Minor


There are a few common points of confusion in the UI that could be clarified 
with tooltips.  We should add tooltips to explain the scheduler delay and the 
shuffle data (to explain why shuffle read is typically < shuffle write, as many 
many people have expressed confusion about).



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