Github user jerrypeng commented on the pull request:
https://github.com/apache/storm/pull/921#issuecomment-165837032
Just for more clarification the eviction policy works independently of the
number of slots. The eviction policy will be evaluated every time cannot be
scheduled regardless the reason (i.e. run out of slots or run out of
resources). The default eviction policy will try to evict as many things as
possible (within policy limits) to try to make space for a topology that was
unsuccessfully scheduled
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