Github user HeartSaVioR commented on the pull request: https://github.com/apache/storm/pull/532#issuecomment-110216352 @itaifrenkel I think Spout doesn't matter since subprocess has a chance to slow down its flow. But Bolt does matter cause ShellBolt sends all tuples to subprocess, and ShellBolt actually doesn't trace tuples. More details are described to STORM-756.
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