Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/11943#discussion_r57385602
--- Diff: core/src/main/scala/org/apache/spark/memory/MemoryManager.scala
---
@@ -176,6 +177,7 @@ private[spark] abstract class MemoryManager(
if (conf.getBoolean("spark.memory.offHeap.enabled", false)) {
require(conf.getSizeAsBytes("spark.memory.offHeap.size", 0) > 0,
"spark.memory.offHeap.size must be > 0 when
spark.memory.offHeap.enabled == true")
+ require(Platform.unaligned(), "No support for unaligned Unsafe")
--- End diff --
Could you add a better instruction for the user? E.g., tell them to set
spark.memory.offHeap.enabled to false.
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