Github user mallman commented on a diff in the pull request:
https://github.com/apache/spark/pull/15125#discussion_r101818789
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/GraphOps.scala ---
@@ -362,12 +362,14 @@ class GraphOps[VD: ClassTag, ED: ClassTag](graph:
Graph[VD, ED]) extends Seriali
def pregel[A: ClassTag](
initialMsg: A,
maxIterations: Int = Int.MaxValue,
+ checkpointInterval: Int = 25,
--- End diff --
Good point in both cases. I'm wondering if the periodic pregel
checkpointing operation should be controlled by a config value instead.
Suppose, for example, we create a config key
`spark.graphx.pregel.checkpointInterval`. If it's set to the default value (0,
to retain existing functionality), checkpointing is disabled. If it's set to a
positive integer, the checkpointing is performed with that many iterations.
Other values are invalid.
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