Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/15125#discussion_r112821540
--- Diff: docs/graphx-programming-guide.md ---
@@ -708,9 +708,8 @@ 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: to avoid stackOverflowError due to long
lineage chains, graph and
-messages are periodically checkpoint and the checkpoint interval is set by
-"spark.graphx.pregel.checkpointInterval", it can be disable by set as -1):
+of its implementation (note: to avoid stackOverflowError due to long
lineage chains, pregel support periodcally
+checkpoint graph and messages by setting
"spark.graphx.pregel.checkpointInterval"):
--- End diff --
I think we can recommend a good value (say 10 was the earlier default) to
set to since now it defaults to off
Also, good point about checkpointdir - would be good to mention that is
required be set as well and link to any doc we have on that
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