dbaliafroozeh commented on a change in pull request #27267: [SPARK-30556][SQL]
Copy sparkContext.localproperties to child thread
inSubqueryExec.executionContext
URL: https://github.com/apache/spark/pull/27267#discussion_r380707786
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/SQLExecution.scala
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@@ -164,4 +166,20 @@ object SQLExecution {
}
}
}
+
+ /**
+ * Wrap passed function to ensure necessary thread-local variables like
+ * SparkContext local properties are forwarded to execution thread
+ */
+ def withThreadLocalCaptured[T](
+ sparkSession: SparkSession, exec: ExecutionContext)(body: => T):
Future[T] = {
+ val activeSession = sparkSession
+ val sc = sparkSession.sparkContext
+ val localProps = Utils.cloneProperties(sc.getLocalProperties)
+ Future {
+ SparkSession.setActiveSession(activeSession)
+ sc.setLocalProperties(localProps)
Review comment:
@hvanhovell two questions:
- Shouldn't we clone`localProps` here? in the sense that what if a
concurrent thread modify them?
- Does the order of setting `localProps` and `activeSession` matter?
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