Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/17558
`SparkContext` support `add jar`, but doesn't support `uninstall jar`.
Imagine that I have a spark-sql or
[spark-thriftserver](https://github.com/apache/spark/tree/v2.1.0/sql/hive-thriftserver)
and I need upgrade UDF from `spark-udfs-v1.0.0.jar` to
`spark-udfs-v1.1.0.jar`, I must restart thriftserver to make sure use
`spark-udfs-v1.1.0.jar`.
I can manual delete `spark-udfs-v1.0.0.jar` to make it lose efficacy with
this PR and don' t need restart thriftserver.
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