Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/21758
> What's the failure mode if there are not enough slots for the barrier
mode? We should throw an exception right?
Yes, as mentioned in
https://github.com/apache/spark/pull/21758/files/c16a47f0d15998133b9d61d8df5310f1f66b11b0#diff-d4000438827afe3a185ae75b24987a61R372
, we shall fail the job on submit if there is no enough slots for the barrier
stage. I'll submit another PR to add this check (tracked by SPARK-24819).
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