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https://issues.apache.org/jira/browse/SPARK-18495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837515#comment-15837515
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Apache Spark commented on SPARK-18495:
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User 'uncleGen' has created a pull request for this issue:
https://github.com/apache/spark/pull/16702
> Web UI should document meaning of green dot in DAG visualization
> ----------------------------------------------------------------
>
> Key: SPARK-18495
> URL: https://issues.apache.org/jira/browse/SPARK-18495
> Project: Spark
> Issue Type: Improvement
> Components: Web UI
> Affects Versions: 2.0.2
> Reporter: Nicholas Chammas
> Priority: Trivial
>
> A green dot in the DAG visualization apparently means that the referenced RDD
> is cached. This is not documented anywhere except in [this blog
> post|https://databricks.com/blog/2015/06/22/understanding-your-spark-application-through-visualization.html].
> It would be good if the Web UI itself documented this somehow (perhaps in the
> tooltip?) so that the user can naturally learn what it means while using the
> Web UI.
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