Github user clockfly commented on the pull request:
https://github.com/apache/storm/pull/305#issuecomment-61632248
dashengju is describling a use scenario that parent process blocks while
trying to read error stream data from sub-process (parent java space throw an
exception, which trigger the error handling).
Becasue sub-process is still running, there is no EOF of errorStream, so
errorStream.read() will blocks.
If in this scenario, we can make sure the child process is dead by called
child.destroy(), then there will be an EOF signalled to its error Stream, and
parent process will not block.
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