Greg Zoller created KAFKA-3571:
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             Summary: Traits for utilities like ConsumerGroupCommand
                 Key: KAFKA-3571
                 URL: https://issues.apache.org/jira/browse/KAFKA-3571
             Project: Kafka
          Issue Type: New Feature
          Components: clients
    Affects Versions: 0.9.0.1
            Reporter: Greg Zoller
            Priority: Minor


I notice that several utilities like ConsumerGroupCommand are implemented 
(hard-wired really) to be command-line utilities.  It'd be really handy for 
testing if these were broken out as Scala traits (that don't call println) with 
the concrete classes or objects being the command-line utility.

As a trait I could create a thin wrapper class passing the same array of 
arguments, and instead of producing screen output the trait could produce 
result classes.  

The command-line utilities (your concrete classes implementing the traits) 
could format screen output from the result classes.

Why do this?  It'd be a really nice way for test code to query things like 
offsets and such after a test run.



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