diff options
| -rw-r--r-- | docs/tuning.md | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/tuning.md b/docs/tuning.md index cbf37213aa..9c43b315bb 100644 --- a/docs/tuning.md +++ b/docs/tuning.md @@ -45,6 +45,7 @@ and calling `conf.set("spark.serializer", "org.apache.spark.serializer.KryoSeria This setting configures the serializer used for not only shuffling data between worker nodes but also when serializing RDDs to disk. The only reason Kryo is not the default is because of the custom registration requirement, but we recommend trying it in any network-intensive application. +Since Spark 2.0.0, we internally use Kryo serializer when shuffling RDDs with simple types, arrays of simple types, or string type. Spark automatically includes Kryo serializers for the many commonly-used core Scala classes covered in the AllScalaRegistrar from the [Twitter chill](https://github.com/twitter/chill) library. |