Github user mallman commented on a diff in the pull request: https://github.com/apache/spark/pull/15125#discussion_r102057156 --- 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 -- Also, we should document the default value and that checkpointing can be disabled by setting this config property to -1.
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