Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10534#discussion_r48785603
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
---
@@ -75,7 +77,7 @@ private[spark] class BlockManager(
val diskBlockManager = new DiskBlockManager(this, conf)
- private val blockInfo = new TimeStampedHashMap[BlockId, BlockInfo]
+ private val blockInfo = new ConcurrentHashMap[BlockId, BlockInfo]
--- End diff --
I was worried about the pitfalls of `.getOrElseUpdate` not being atomic on
`ConcurrentHashMaps` that had been wrapped into Scala maps.
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