Github user lw-lin commented on the pull request:
https://github.com/apache/spark/pull/11845#issuecomment-198714597
Maybe let's summarize a little bit:
- job/stage descriptions are used at 2 places: the `Event Timeline` and the
text tables (`CompletedJobs`/`CompletedStages`)
- job/stage descriptions were intended to contains only texts at first, so
everything's well
- https://github.com/apache/spark/pull/8791 introduced HTML in job/stage
description for streaming jobs
- the text tables works well, because it renders HTML links directly,
without escaping the description
- the event time line escapes the description intentionally, and then
displays the description, leading to the plain `<a href></a>` thing
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