Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/21927#discussion_r207249848
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -340,6 +340,22 @@ class DAGScheduler(
}
}
+ /**
+ * Check to make sure we don't launch a barrier stage with unsupported
RDD chain pattern. The
+ * following patterns are not supported:
+ * 1. Ancestor RDDs that have different number of partitions from the
resulting RDD (eg.
+ * union()/coalesce()/first()/PartitionPruningRDD);
--- End diff --
but anyway, I guess its also fine to not support this case, I was just
trying to understand myself.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
