Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/1485#issuecomment-49504813
@fireflyc again just on my tangent -- the drawback is you leave N threads
allocated taking up non-trivial stack memory and so on. In most of the cases I
see the overhead of starting new threads on demand isn't significant. If what
you describe is happening, then fixed is certainly an improvement over cached.
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