maropu commented on issue #23768: [SPARK-26851][SQL] Fix double-checked locking in CachedRDDBuilder URL: https://github.com/apache/spark/pull/23768#issuecomment-463503451 Ah, good catch! The reference for that is http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html, too. LGTM cc: @cloud-fan @srowen
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