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https://issues.apache.org/jira/browse/SPARK-4388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15127609#comment-15127609
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Alex Bozarth commented on SPARK-4388:
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Fixed by SPARK-5768
> 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
> Labels: starter
>
> 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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