Github user jzhuge commented on the issue:
https://github.com/apache/spark/pull/21709
Thx @jerryshao for looking at the PR.
Compared to spark.metrics.conf.* in SparkConf, a metrics config file can
group the properties together, separate from the rest of the properties. In my
case, there are 10 properties to config. It is also easier to swap out the
config file for different users or different purposes, especially in
self-serving environments.
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