Github user dashengju commented on the pull request:
https://github.com/apache/storm/pull/218#issuecomment-61038451
@HeartSaVioR ,
parent process's exception contains two types: 1) net io error caused; for
example, subprocess report an error to stderr and exit; 2) parent process's
handle logic exception.
as 1), we want to read from stderr to get more information;
as 2), as you say, it may not be right way to capture it when only parent
process raises exception.
@d2r 's suggestion, we should change ShellProcess#getErrorsStream so that
it checks that there is actually something to read.
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