Github user ilganeli commented on the pull request:
https://github.com/apache/spark/pull/3518#issuecomment-67455654
Hi @JoshRosen, I have made the updates we've discussed. Example output is
shown below for two cases of unserializable RDDs. The first is when an
individual RDD is unserializable, the latter is for when a nested RDD
dependency is unserializable.
Case 1:
```scala
val unserializableRdd = new MyRDD(sc, 1, Nil) {
class UnserializableClass
val unserializable = new UnserializableClass
}
val trace : Array[SerializedRef] =
scheduler.tryToSerializeRdd(unserializableRdd)
```
Depth 0: DAGSchedulerSuiteRDD 0 - Failed to serialize parent.
Un-serializable reference trace for DAGSchedulerSuiteRDD 0:
**********************
DAGSchedulerSuiteRDD 0:
--- Ref (class scala.Tuple2, Hash: 1240412896)
--- Ref
(org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$2$$anon$1$UnserializableClass@315df4bb,
Hash: 828241083)
--- Ref (StorageLevel(false, false, false, false, 1), Hash: 1370224403)
--- Ref (None, Hash: 1353759820)
--- Ref (List(), Hash: 1599566873)
--- Ref (scala.Tuple2, Hash: 254955665)
--- Ref (DAGSchedulerSuiteRDD 0, Hash: 279781579)
**********************
org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$2$$anon$1$UnserializableClass@315df4bb:
--- Ref (class scala.Tuple2, Hash: 1240412896)
--- Ref (StorageLevel(false, false, false, false, 1), Hash: 1370224403)
--- Ref (None, Hash: 1353759820)
--- Ref (List(), Hash: 1599566873)
--- Ref (scala.Tuple2, Hash: 254955665)
--- Ref (DAGSchedulerSuiteRDD 0, Hash: 279781579)
--- Ref
(org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$2$$anon$1$UnserializableClass@315df4bb,
Hash: 828241083)
**********************
Case 2:
```scala
val baseRdd = new MyRDD(sc, 1, Nil)
val midRdd = new MyRDD(sc, 1, List(new OneToOneDependency(baseRdd)))
val finalRdd = new MyRDD(sc, 1, List(new OneToOneDependency(midRdd))) {
class UnserializableClass
val unserializable = new UnserializableClass
}
val trace : Array[SerializedRef] = scheduler.tryToSerializeRdd(finalRdd)
```
Depth 0: DAGSchedulerSuiteRDD 2 - Failed to serialize parent.
Depth 1: DAGSchedulerSuiteRDD 1 - Success
Depth 2: DAGSchedulerSuiteRDD 0 - Success
Un-serializable reference trace for DAGSchedulerSuiteRDD 2:
**********************
DAGSchedulerSuiteRDD 2:
--- Ref (DAGSchedulerSuiteRDD 0, Hash: 1968196847)
--- Ref (org.apache.spark.OneToOneDependency@29d37757, Hash: 701724503)
--- Ref (List(org.apache.spark.OneToOneDependency@29d37757), Hash:
1255445356)
--- Ref (DAGSchedulerSuiteRDD 1, Hash: 1787987889)
--- Ref (org.apache.spark.OneToOneDependency@3e598df9, Hash: 1046056441)
--- Ref (class scala.Tuple2, Hash: 1240412896)
--- Ref (StorageLevel(false, false, false, false, 1), Hash: 1370224403)
--- Ref (None, Hash: 1353759820)
--- Ref
(org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$3$$anon$2$UnserializableClass@3887cf88,
Hash: 948424584)
--- Ref (List(org.apache.spark.OneToOneDependency@3e598df9), Hash:
1618683794)
--- Ref (List(), Hash: 1599566873)
--- Ref (scala.Tuple2, Hash: 550572371)
--- Ref (DAGSchedulerSuiteRDD 2, Hash: 1726715997)
**********************
org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$3$$anon$2$UnserializableClass@3887cf88:
--- Ref (DAGSchedulerSuiteRDD 0, Hash: 1968196847)
--- Ref (org.apache.spark.OneToOneDependency@29d37757, Hash: 701724503)
--- Ref (List(org.apache.spark.OneToOneDependency@29d37757), Hash:
1255445356)
--- Ref (DAGSchedulerSuiteRDD 1, Hash: 1787987889)
--- Ref (org.apache.spark.OneToOneDependency@3e598df9, Hash: 1046056441)
--- Ref (class scala.Tuple2, Hash: 1240412896)
--- Ref (StorageLevel(false, false, false, false, 1), Hash: 1370224403)
--- Ref (None, Hash: 1353759820)
--- Ref (List(org.apache.spark.OneToOneDependency@3e598df9), Hash:
1618683794)
--- Ref (List(), Hash: 1599566873)
--- Ref (scala.Tuple2, Hash: 550572371)
--- Ref (DAGSchedulerSuiteRDD 2, Hash: 1726715997)
--- Ref
(org.apache.spark.scheduler.DAGSchedulerSuite$$anonfun$3$$anon$2$UnserializableClass@3887cf88,
Hash: 948424584)
**********************
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