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From Xu Lijie <>
Subject Checkpoint bugs in GraphX
Date Tue, 11 Nov 2014 02:19:03 GMT
Hi, all. I'm not sure whether someone has reported this bug:

There should be a checkpoint() method in EdgeRDD and VertexRDD as follows:

override def checkpoint(): Unit = { partitionsRDD.checkpoint() }

Current EdgeRDD and VertexRDD use *RDD.checkpoint()*, which only checkpoint
the edges/vertices but not the critical partitionsRDD.

Also, the variables (partitionsRDD and targetStroageLevel) in EdgeRDD and
VertexRDD should be transient.

class EdgeRDD[@specialized ED: ClassTag, VD: ClassTag]( @transient val
partitionsRDD: RDD[(PartitionID, EdgePartition[ED, VD])], @transient val
targetStorageLevel: StorageLevel = StorageLevel.MEMORY_ONLY) extends
RDD[Edge[ED]](partitionsRDD.context, List(new
OneToOneDependency(partitionsRDD))) {

class VertexRDD[@specialized VD: ClassTag]( @transient val partitionsRDD:
RDD[ShippableVertexPartition[VD]], @transient val targetStorageLevel:
StorageLevel = StorageLevel.MEMORY_ONLY) extends RDD[(VertexId,
VD)](partitionsRDD.context, List(new OneToOneDependency(partitionsRDD))) {

These two bugs usually lead to stackoverflow error in iterative application
written by GraphX.

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