Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/14720#discussion_r75601779
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
---
@@ -87,6 +88,9 @@ private[hive] class HiveClientImpl(
// Circular buffer to hold what hive prints to STDOUT and ERR. Only
printed when failures occur.
private val outputBuffer = new CircularBuffer()
+ // An object lock to ensure URL factory is registered exactly once.
+ object URLFactoryRegistrationLock{}
--- End diff --
Why do you need `{}`?
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