Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7910#issuecomment-137207794
I would strongly prefer to do the grep in the browser; all of the data
that we're filtering is present there anyways and it will lead to better UX
because it can support features like "search as you type."
In addition, the UX semantics of a grep that requires a roundtirp to Scala
are a bit different: in that case, each grep call is obtaining and searching a
_different_ thread dump, whereas I imagine that most users want to search
within the _same_ threadump with different queries. (Apologizes if I've
misunderstood the current behavior).
Also: is regex support really what users want / expect here? We should
think through actual use-cases carefully before spending a bunch of time
building a tool that's helpful to a handful of power users but which offers
less utility for an average user.
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