Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3036#issuecomment-62440690
add to whitelist
The reason why it searches for the specific message is that we want to
isolate the specific kind of `BindException` that corresponds to port
collision. The issue is that there are other kinds of `BindException`s that we
cannot get around by incrementing the port, e.g. permission denied. This patch
will cause some false positives, but I think it's worth merging it because what
it fixes is more important.
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