[jira] [Created] (SPARK-4388) Add tooltips to explain maxMemory / usedMemory columns in executor UI

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-4388:
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             Summary: Add tooltips to explain maxMemory / usedMemory columns in executor UI
                 Key: SPARK-4388
                 URL: https://issues.apache.org/jira/browse/SPARK-4388
             Project: Spark
          Issue Type: Improvement
          Components: Documentation, Web UI
            Reporter: Josh Rosen
            Priority: Minor


I've spoken to users who were confused by the max memory / used memory columns in the executor UI, since the max memory was less than the total amount of memory in their executor.  This behavior is expected, since this is only showing the fraction of memory that's reserved for caching, but we should add a tooltip to explain this in order to avoid confusion.



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