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Discussion thread: here

JIRA: 

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

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• When "--output-path" is specified by user, final results of ProducerPerformance and ConsumerPerformance will be printed not only to the standard output but also to the given file in CSV format. An exception will be thrown if the file already exists.
• When "--output-with-header" is specified, a header record will be also printed into the output file (it will be the first line of the output). This argument only takes effect if  "--output-path" is also specified (documentation should).

Example:

Running ProducerPerformance tool with the following options:

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There won't be any change of current behavior. New arguments of ProducerPerformance and ConsumerPerformance are optional. 

Test Plan

Review existing unit tests and implement new test cases that cover new functionality.

Rejected alternatives

Make delimiters configurable

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