gaborgsomogyi commented on a change in pull request #28368:
URL: https://github.com/apache/spark/pull/28368#discussion_r420702039



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/connection/DB2ConnectionProvider.scala
##########
@@ -48,7 +48,7 @@ private[sql] class DB2ConnectionProvider(driver: Driver, 
options: JDBCOptions)
     result
   }
 
-  override def setAuthenticationConfigIfNeeded(): Unit = {
+  override def setAuthenticationConfigIfNeeded(): Unit = 
SecurityConfigurationLock.synchronized {

Review comment:
       Of course this tests the fact that multiple database instances can be 
accessed from the same JVM and not the race itself.




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