Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r116475494
--- Diff: core/src/main/scala/org/apache/spark/memory/MemoryManager.scala
---
@@ -54,7 +54,8 @@ private[spark] abstract class MemoryManager(
onHeapStorageMemoryPool.incrementPoolSize(onHeapStorageMemory)
onHeapExecutionMemoryPool.incrementPoolSize(onHeapExecutionMemory)
- protected[this] val maxOffHeapMemory =
conf.getSizeAsBytes("spark.memory.offHeap.size", 0)
+ protected[this] val maxOffHeapMemory =
+ conf.getSizeAsBytes("spark.memory.offHeap.size", 384 * 1024 * 1024)
--- End diff --
I think it's reasonable to have a non-zero default value for off-heap size,
but we should update the document.
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