Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23244#discussion_r239451274
--- Diff:
core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -209,23 +205,14 @@ public BytesToBytesMap(
TaskMemoryManager taskMemoryManager,
--- End diff --
If this constructor is called, the `enablePerfMetrics` will be false. Where
do we use this constructor?
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