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[SPARK-5461] [graphx] Add isCheckpointed, getCheckpointedFiles method…
…s 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): [apache#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 apache#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
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