Github user dashengju commented on the pull request:
https://github.com/apache/storm/pull/497#issuecomment-90392638
@HeartSaVioR
We have tested the patch. It solved most of the problem, but it still exist
in some cases.
Currently, even with ACK, the subprocess handle one tuple, emit the
result, and read all the tuples from stdin to get the id, read all the tuples
from stdin needs long time, which cause exceed timeout.
So we limit the queue-size in ShellBolt to 100, just make the read all the
tuples from stdin operation a short time can avoid the problem.
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