Github user squito commented on the issue:

    https://github.com/apache/spark/pull/23090
  
    I think the default is pretty reasonable in most cases, in that this is the 
first time we've heard of someone hitting this limit.  I'm not sure how high we 
would make it to get around this problem in general.  And from the jetty docs: 
https://www.eclipse.org/jetty/javadoc/current/org/eclipse/jetty/server/HttpConfiguration.html#setRequestHeaderSize-int-
    
    > Larger headers will allow for more and/or larger cookies plus larger form 
content encoded in a URL. However, larger headers consume more memory and can 
make a server more vulnerable to denial of service attacks.


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