Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3582#discussion_r21352510
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockInfo.scala ---
@@ -26,6 +29,17 @@ private[storage] class BlockInfo(val level:
StorageLevel, val tellMaster: Boolea
private def failed: Boolean = size == BlockInfo.BLOCK_FAILED
private def initThread: Thread = BlockInfo.blockInfoInitThreads.get(this)
+ val lock = new ReentrantLock()
+ private val waitNCondition = lock.newCondition()
--- End diff --
These variables could use comments to explain what they're used for.
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