Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/17500
  
    I get it, though I'm still not sure it's a great solution to artificially 
open and close the socket just for this. Is there no other way to probe whether 
a port is available or is that about the best one can do, to actually try to 
open it?
    
    I see 
`log4j.logger.org.spark_project.jetty.util.component.AbstractLifeCycle` in our 
log4j properties files, so clearly this is intended to be silenced by log 
config already. Is that not taking effect? if you haven't changed anything then 
clearly it isn't. I wonder if for some reason the unshaded package's logger 
needs to be configured, if so? 
`log4j.logger.org.eclipse.jetty.util.component.AbstractLifeCycle=ERROR`


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