Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/1019#discussion_r13955026
--- Diff: conf/log4j.properties.template ---
@@ -6,6 +6,6 @@ log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p
%c{1}: %m%n
# Settings to quiet third party logs that are too verbose
-log4j.logger.org.eclipse.jetty=WARN
--- End diff --
That other line has been in spark since way before we added this port
retrying, so I don't think that's why it's there. IIRC there are various jetty
services that will spit out logging information, especially at start up and
shut down, and so we've always used this blanket statement. See for example
Spark 0.5 which is more than 2 years old (before we even had a UI).
https://github.com/apache/spark/blob/branch-0.5/conf/log4j.properties.template#L7
If you'd like to audit this at some point that would be great (it might be
hard to find all cases where jetty will print something). But since this change
is about the port issue specifically, it might be good not to change that other
behavior in this patch
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