Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/21758
Hi @jiangxb1987 one question about barrier task.
For example, `rddA` is marked as barrier, and `rddB` is a normal RDD, if
`rddC = rddA.union(rddB)`, seems it contains both normal task and barrier, will
you try to mark tasks generated from `rddB` also as barrier task, or you will
only mark tasks from 'rddA' as barrier tasks? This will potentially affect the
resource demands, as `rddA` requires gang semantics, whereas `rddB` doesn't
require that.
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