Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1996#issuecomment-52570748
It happens for the main use case which is the server. And for non-server,
users have to explicitly create multiple threads to access conf to make
contention happen. Either way, this code path is not some highly contended
thing that you'd want a ConcurrentHashMap for.
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