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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