bbende commented on issue #4154: NIFI-7271 Make command timeout configurable for ShellUserGroupProvider URL: https://github.com/apache/nifi/pull/4154#issuecomment-602813340 @alopresto thanks for reviewing! During further testing, I found that we can't rely on calling `process.start()` and then calling `waitFor(...)` without every trying to read the output from the process. So I've added another commit that adds an Executor to the ShellRunner so after calling start() we submit a task to start reading from the input stream, then back in the main thread we call waitFor(). I also made the change from long to int.
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