Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22855#discussion_r229740163
--- Diff:
core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala ---
@@ -84,6 +85,7 @@ class KryoSerializer(conf: SparkConf)
private val avroSchemas = conf.getAvroSchema
// whether to use unsafe based IO for serialization
private val useUnsafe = conf.getBoolean("spark.kryo.unsafe", false)
+ private val usePool = conf.getBoolean("spark.kryo.pool", false)
--- End diff --
Yep, I'd leave this undocumented
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