srowen commented on a change in pull request #26498: [SPARK-29872] Improper
cache strategy in examples
URL: https://github.com/apache/spark/pull/26498#discussion_r345758135
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File path: examples/src/main/scala/org/apache/spark/examples/SparkTC.scala
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@@ -55,20 +55,24 @@ object SparkTC {
// the graph to obtain the path (x, z).
// Because join() joins on keys, the edges are stored in reversed order.
- val edges = tc.map(x => (x._2, x._1))
+ val edges = tc.map(x => (x._2, x._1)).cache()
Review comment:
This is more complex for an example, but, I think it's reasonably important
to show this pattern in this type of example.
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