Github user ajbozarth commented on the issue:
https://github.com/apache/spark/pull/19049
I'll try to clarify @srowen issue for you @guoxiaolongzte
For most use-cases each Spark cluster has it's own history server and also
uses one type of resource manager. Therefore for most history servers all the
applications would use the same resource manager.
This doesn't mean one history server can't have apps with multiple resource
mangers, but @srowen is arguing that it's a rare case. I would tend to agree
with him. I think this feature might help cluster admins who collect lots of
event logs to sift through on a history server, but they're not the average
user.
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