Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/15125#discussion_r102897015
--- Diff: docs/graphx-programming-guide.md ---
@@ -708,7 +708,9 @@ messages remaining.
> messaging function. These constraints allow additional optimization
within GraphX.
The following is the type signature of the [Pregel
operator][GraphOps.pregel] as well as a *sketch*
-of its implementation (note calls to graph.cache have been removed):
+of its implementation (note: to avoid stackOverflowError due to long
lineage chains, graph and
--- End diff --
I mean if there is a reason to have graphCheckpointer in the example, if
you could explain it, it would make it easier for us to review those.
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