Github user kanakb commented on the pull request:
https://github.com/apache/helix/pull/30#issuecomment-117433383
This should fail fast if you try to set parallelism on workflows that do
not have a target resource. Also, what if the target resource has its
partitions assigned to other instances? I'm not fully convinced that this is
safe except in the case where the task has a target resource and that target
resource is assigned to a fixed set of instances.
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