Hi, I'm working on a RDD of a tuple of objects which represent trees (Node containing a hashmap of nodes). I'm trying to aggregate these trees over the RDD.
Let's take an example, 2 graphs : C - D - B - A - D - B - E F - E - B - A - D - B - F I'm spliting each graphs according to the vertex A resulting in : (B(1, D(1, C(1,))) , D(1, B(1, E(1,))) (B(1, E(1, F(1,))) , D(1, B(1, F(1,))) And I want to aggregate both graph getting : (B(2, (D(1, C(1,)), E(1, F(1,)))) , D(2, B(2, (E(1,), F(1,))) Some graph are potentially large (+4000 vertex) but I'm not supposed to have any cyclic references. When I run my program I get this error : java.lang.StackOverflowError at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:127) at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:115) at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:610) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:721) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648) at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648) I've tried to increase the size of the stake and use the standard java serializer but no effect. Any hint of the reason of this error and ways to change my code to solve it ? -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/serialization-stakeoverflow-error-during-reduce-on-nested-objects-tp22040.html Sent from the Apache Spark User List mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@spark.apache.org For additional commands, e-mail: user-h...@spark.apache.org