Github user jicongrui commented on the pull request:
https://github.com/apache/helix/pull/30#issuecomment-119019518
The comment says, "_parallelJobs would kind of break the job dependency,
e.g: if job1 -> job2, but _parallelJobs == 2, then job1 and job2 could be
scheduled at the same time".
Parallel and dependency are semantically incompatible, and this diff allows
user to put "parallel" in a higher priority than "dependency". User must know
"dependency" would be downgraded to "preferred schedule order" when parallel
count is bigger than 1.
For 1, even there is node failure, job1 can still be finished before job0.
This diff doesn't commits the finishing order.
For 2, job0 and job1 are scheduled to different instances and executed in
parallel.
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