Github user jicongrui commented on the pull request:
https://github.com/apache/helix/pull/30#issuecomment-117438877
The assignment follows the same logic as before, and it can be considered
as a black box, whose input is job and output is task assignment.
So this diff only checks the output, task assignment, and remove busy
instances from task assignment.
E.g. If the target resource change resource to a different set of
instances, the task assignment would contain no busy instances, so job2 can be
executed on any of the new instance.
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