apache/kafka — pull request #37 by maji2014 (2014-12-24 03:30:08+00:00)
Title: [Kafka-1828]add judgement for ConsumerPerformance against negative number

The result is negative number when runnning a short time for consumer performance testing, but user doesn't the reason, so add judgement for this, and then according to the reason, user can do ConsumerPerformance.