Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18041
@LantaoJin I don't think you have to do trim for metrics conf coming from
`SparkConf`:
1. `SparkConf` already handles `trim` when reading from spark-defaults.conf
file.
2. If you deliberately add trailing WS from code like
[here](https://github.com/apache/spark/pull/18041/files#diff-95b5e3102194fb12cc31f0b98e8b70a7R165),
I think it's up to you to guarantee the correctness of such configuration.
For metrics conf reading from metrics property file, I think we could trim
the trailing whitespace when reading from property file.
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