Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3456#issuecomment-64945905
I
[commented](https://issues.apache.org/jira/browse/SPARK-4598?focusedCommentId=14228677&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14228677)
over on JIRA, but just to recap here: the high memory usage is due to the
`scala.xml` NodeSeq corresponding to the Stage page and the string containing
the generated markup. The stage page, uncompressed, was over 75MB for a stage
with tens of thousands of tasks and the NodeSeq was ~200MB.
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