Github user zd-project commented on the issue: https://github.com/apache/storm/pull/2743 You should be able to see the usage in [here](https://github.com/apache/storm/pull/2754/files#diff-9c4945e8e924565ca1f071435f4711e9R3711), [here](https://github.com/apache/storm/pull/2710/commits/73b934420c2fd7ad441d3c0467376871d915b230) and [here](https://github.com/apache/storm/pull/2710/commits/778f30711af35732a5a13e1317dda6df905133c4)
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