Github user HeartSaVioR commented on the pull request:
https://github.com/apache/storm/pull/532#issuecomment-110216616
@itaifrenkel Actually I read paper about Twitter Heron, and it can
propagate backpressure.
Storm currently doesn't have it, so ShellBolt itself should ensure
backpressure cause it's better to let machine failure triggered by subprocess
(unlimited memory consumption).
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