Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3009#issuecomment-64063836
Just noticed that the "Completed Stages" table still shows a "Kill" button:

This is the case on the stages page, too. Do you know if this was a bug in
the existing web UI or whether there's a reason for this (maybe related to
re-computed stages being cancellable)?
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