Github user kanakb commented on the pull request:
https://github.com/apache/helix/pull/6#issuecomment-58448716
Since this is an open source project, the real answer to this question is
"I don't know." We've made two public releases with this change, and so if
there is anyone who has integrated or is planning to integrate with the task
framework, they would need to made a change.
If `ProgressReportingTask` handles the JMX reporting itself (it's an
abstract class, not an interface), then `TaskRunner` wouldn't need to care
about progress at all.
And back to the "bogus" return value discussion, I think customers who
don't have a good sense of progress shouldn't be required to change their
integration just to implement `getProgress()`.
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