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[SPARK-4620] Add unpersist in Graph and GraphImpl #3476

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[SPARK-4620] Add unpersist in Graph and GraphImpl #3476

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7 changes: 7 additions & 0 deletions graphx/src/main/scala/org/apache/spark/graphx/Graph.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,13 @@ abstract class Graph[VD: ClassTag, ED: ClassTag] protected () extends Serializab
*/
def cache(): Graph[VD, ED]

/**
* Uncaches both vertices and edges of this graph. It is useful that iterative algorithms build
* a new graph in each iteration, and the vertices and edges of previous iterations are no
* longer needed for following iterations.
*/
def unpersist(blocking: Boolean = true): Graph[VD, ED]

/**
* Uncaches only the vertices of this graph, leaving the edges alone. This is useful in iterative
* algorithms that modify the vertex attributes but reuse the edges. This method can be used to
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6 changes: 6 additions & 0 deletions graphx/src/main/scala/org/apache/spark/graphx/impl/GraphImpl.scala
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Expand Up @@ -65,6 +65,12 @@ class GraphImpl[VD: ClassTag, ED: ClassTag] protected (
this
}

override def unpersist(blocking: Boolean = true): Graph[VD, ED] = {
unpersistVertices(blocking)
replicatedVertexView.edges.unpersist(blocking)
this
}

override def unpersistVertices(blocking: Boolean = true): Graph[VD, ED] = {
vertices.unpersist(blocking)
// TODO: unpersist the replicated vertices in `replicatedVertexView` but leave the edges alone
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