SPARK-1813. Add a utility to SparkConf that makes using Kryo really easy

Author: Sandy Ryza <sandy@cloudera.com>

Closes #789 from sryza/sandy-spark-1813 and squashes the following commits:

48b05e9 [Sandy Ryza] Simplify
b824932 [Sandy Ryza] Allow both spark.kryo.classesToRegister and spark.kryo.registrator at the same time
6a15bb7 [Sandy Ryza] Small fix
a2278c0 [Sandy Ryza] Respond to review comments
6ef592e [Sandy Ryza] SPARK-1813. Add a utility to SparkConf that makes using Kryo really easy

1 files changed, 2 insertions, 15 deletions

diff --git a/docs/tuning.md b/docs/tuning.md
index 8fb2a0433b..9b5c9adac6 100644
--- a/docs/tuning.md
+++ b/docs/tuning.md
@@ -47,24 +47,11 @@ registration requirement, but we recommend trying it in any network-intensive ap
 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.
 
-To register your own custom classes with Kryo, create a public class that extends
-[`org.apache.spark.serializer.KryoRegistrator`](api/scala/index.html#org.apache.spark.serializer.KryoRegistrator) and set the
-`spark.kryo.registrator` config property to point to it, as follows:
+To register your own custom classes with Kryo, use the `registerKryoClasses` method.
 
 {% highlight scala %}
-import com.esotericsoftware.kryo.Kryo
-import org.apache.spark.serializer.KryoRegistrator
-
-class MyRegistrator extends KryoRegistrator {
-  override def registerClasses(kryo: Kryo) {
-    kryo.register(classOf[MyClass1])
-    kryo.register(classOf[MyClass2])
-  }
-}
-
 val conf = new SparkConf().setMaster(...).setAppName(...)
-conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")
-conf.set("spark.kryo.registrator", "mypackage.MyRegistrator")
+conf.registerKryoClasses(Seq(classOf[MyClass1], classOf[MyClass2]))
 val sc = new SparkContext(conf)
 {% endhighlight %}