gaborgsomogyi commented on a change in pull request #29932:
URL: https://github.com/apache/spark/pull/29932#discussion_r498689492



##########
File path: 
external/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/MariaDBKrbIntegrationSuite.scala
##########
@@ -30,7 +30,7 @@ class MariaDBKrbIntegrationSuite extends 
DockerKrbJDBCIntegrationSuite {
   override protected val keytabFileName = "mariadb.keytab"
 
   override val db = new DatabaseOnDocker {
-    override val imageName = "mariadb:10.4"
+    override val imageName = sys.env.getOrElse("MARIADB_DOCKER_IMAGE_NAME", 
"mariadb:10.4")

Review comment:
       I've executed the mentioned test with this PR (`mariadb:10.4`) but it 
works fine on my machine.
   <img width="397" alt="Screenshot 2020-10-02 at 10 23 09" 
src="https://user-images.githubusercontent.com/18561820/94904123-1d1fd700-049b-11eb-8275-74a0f2cc3fd1.png";>
   What I can imagine is that the docker version is different. When I've 
started the development in this area I remember there was quite a stuggle to 
install a working version. I'm still not on the latest.
   <img width="373" alt="Screenshot 2020-10-02 at 10 17 49" 
src="https://user-images.githubusercontent.com/18561820/94904337-7425ac00-049b-11eb-8e3e-f1f8b0b37062.png";>
   




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