zjffdu commented on a change in pull request #4173:
URL: https://github.com/apache/zeppelin/pull/4173#discussion_r681474007



##########
File path: 
zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/launcher/SparkInterpreterLauncher.java
##########
@@ -106,7 +106,7 @@ public SparkInterpreterLauncher(ZeppelinConfiguration 
zConf, RecoveryStorage rec
               " to false if you want to use other modes.");
     }
 
-    StringBuilder sparkConfBuilder = new StringBuilder();
+    List<String> sparkConfList = new ArrayList<>();

Review comment:
       Thanks for the review, PR is updated, `SparkInterpreterLauncher` & 
`FlinkInterpreterLauncher` both use StringJoiner now.




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