Github user XuTingjun commented on the pull request:
https://github.com/apache/spark/pull/3456#issuecomment-64843591
First, I found showing tasks on web causing a lot of memory. No
pagination, 5000 tasks will occurs OOM. With pagination, 20000 tasks can
successfully show in web. I have tested it.
Second, sotring is before pagination, so pagination will not break all of
our sorting capabilities in the UI.

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