Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5868#discussion_r29559935
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala ---
@@ -131,8 +131,7 @@ private[spark] class ExternalSorter[K, V, C](
private val kvChunkSize = conf.getInt("spark.shuffle.sort.kvChunkSize",
1 << 22) // 4 MB
private val useSerializedPairBuffer =
!ordering.isDefined &&
conf.getBoolean("spark.shuffle.sort.serializeMapOutputs", true) &&
- ser.isInstanceOf[KryoSerializer] &&
- serInstance.asInstanceOf[KryoSerializerInstance].getAutoReset
+ ser.supportsRelocationOfSerializedObjects
--- End diff --
@sryza, this change is intended to partially address
https://issues.apache.org/jira/browse/SPARK-7311.
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