viirya commented on a change in pull request #30899:
URL: https://github.com/apache/spark/pull/30899#discussion_r547659470
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvalPythonExec.scala
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@@ -137,3 +138,18 @@ trait EvalPythonExec extends UnaryExecNode {
}
}
}
+
+/**
+ * A TaskContext aware iterator.
+ *
+ * As the Python evaluation consumes the parent iterator in a separate thread,
+ * it could consume more data from the parent even after the task ends and the
parent is closed.
Review comment:
Maybe add "If an off-heap column vector exists in the parent iterator,
it could cause segmentation fault which crashes the executor." here too?
Current phrase is not clear why it is bad to read closed parent.
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