Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3543#issuecomment-122707496
Haven't dug in to this in detail yet, but it's possible that the bug that
motivated the `CONFIGURATION_INSTANTIATION_LOCK` is no longer relevant to us
because we no longer support the affected Hadoop versions. It would be great
if someone more familiar with Hadoop version numbering / JIRA conventions could
look at the Hadoop JIRA ticket to figure this out. If it turns out that it
only affects pre-Hadoop 1.2.1 versions, then we might be able to just remove
that lock entirely.
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