[SPARK-5461] [graphx] Add isCheckpointed, getCheckpointedFiles methods to Graph

Added the 2 methods to Graph and GraphImpl.  Both make calls to the underlying vertex and edge RDDs.

This is needed for another PR (for LDA): [https://github.com/apache/spark/pull/4047]

Notes:
* getCheckpointedFiles is plural and returns a Seq[String] instead of an Option[String].
* I attempted to test to make sure the methods returned the correct values after checkpointing.  It did not work; I guess that checkpointing does not occur quickly enough?  I noticed that there are not checkpointing tests for RDDs; is it just hard to test well?

CC: rxin

CC: mengxr  (since related to LDA)

Author: Joseph K. Bradley <joseph@databricks.com>

Closes #4253 from jkbradley/graphx-checkpoint and squashes the following commits:

b680148 [Joseph K. Bradley] added class tag to firstParent call in VertexRDDImpl.isCheckpointed, though not needed to compile
250810e [Joseph K. Bradley] In EdgeRDDImple, VertexRDDImpl, added transient back to partitionsRDD, and made isCheckpointed check firstParent instead of partitionsRDD
695b7a3 [Joseph K. Bradley] changed partitionsRDD in EdgeRDDImpl, VertexRDDImpl to be non-transient
cc00767 [Joseph K. Bradley] added overrides for isCheckpointed, getCheckpointFile in EdgeRDDImpl, VertexRDDImpl. The corresponding Graph methods now work.
188665f [Joseph K. Bradley] improved documentation
235738c [Joseph K. Bradley] Added isCheckpointed and getCheckpointFiles to Graph, GraphImpl

1 files changed, 6 insertions, 0 deletions

diff --git a/project/MimaExcludes.scala b/project/MimaExcludes.scala
index 14ba03ed46..45be1db9a5 100644
--- a/project/MimaExcludes.scala
+++ b/project/MimaExcludes.scala
@@ -127,6 +127,12 @@ object MimaExcludes {
             // SPARK-5315 Spark Streaming Java API returns Scala DStream
             ProblemFilters.exclude[MissingMethodProblem](
               "org.apache.spark.streaming.api.java.JavaDStreamLike.reduceByWindow")
+          ) ++ Seq(
+            // SPARK-5461 Graph should have isCheckpointed, getCheckpointFiles methods
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.graphx.Graph.getCheckpointFiles"),
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.graphx.Graph.isCheckpointed")
           )
 
         case v if v.startsWith("1.2") =>