Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4142#issuecomment-83019544
Our config directories don't generally contain a lot of files (a handful
usually), but I can see it being different for different people.
My initial gut feeling is that at least the HDFS config files, and perhaps
the Yarn ones, are needed on the executors. Others (like hive-site.xml) are
only needed by the driver (not even the AM). Let me see if there's a clean way
to separate those out - then this change could be a hybrid of the original
patch, which basically serialized the YarnConfiguration object, and this one
for the other conf files.
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