Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/179#issuecomment-38084443
Hey @zsxwing thanks for reporting this and proposing a fix!
The way it is now has some performance implications because it creates a
new date format every time one is needed. I'd suggest instead that each of the
individual pages/tables should create a date format as a `val` and then re-use
it. A single page/table cannot be access concurrently from multiple threads, so
this is safe.
To make this easy we can add a utility function called `createDateFormat`
inside of the `WebUI` object.
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