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https://issues.apache.org/jira/browse/SPARK-4800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-4800.
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Resolution: Incomplete
> RDD Preview Feature in WebUI
> ----------------------------
>
> Key: SPARK-4800
> URL: https://issues.apache.org/jira/browse/SPARK-4800
> Project: Spark
> Issue Type: Improvement
> Components: Web UI
> Reporter: Kevin Mader
> Priority: Minor
> Labels: bulk-closed
>
> For debugging and monitoring analysis, it would be very useful to have an RDD
> preview feature that would show 'previews' for persistent RDDs. These
> previews could be very simple for known types DoubleRDD (mean, std, min, max)
> and could be optionally extended by implementing a sub-class (showing
> histograms, plotting Key-value pairs, etc)
> The component would add an additional load if used to the Context since the
> RDD "first", "count", etc methods would need to be invoked, but it could be
> kept fairly lightweight.
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