Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19760
I'm ok to move the deprecated config keys of
`MAX_REMOTE_BLOCK_SIZE_FETCH_TO_MEM` and `LISTENER_BUS_EVENT_QUEUE_CAPACITY` to
`SparkConf` if the deprecation message really matters. But I'd like to keep
`withAlternatives`. Generally it's a better interface and my future plan is to
move config related stuff to a new maven module, so it can be used in modules
that don't depend on the core module(e.g. the network module). It will be
annoying if everytime we wanna deprecate a conf we need to change the config
module.
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