huage1994 commented on a change in pull request #4293:
URL: https://github.com/apache/zeppelin/pull/4293#discussion_r795164516



##########
File path: 
zeppelin-plugins/launcher/yarn/src/main/java/org/apache/zeppelin/interpreter/launcher/YarnRemoteInterpreterProcess.java
##########
@@ -178,6 +178,10 @@ public void start(String userName) throws IOException {
       this.appId = appResponse.getApplicationId();
       ApplicationSubmissionContext appContext = 
yarnApplication.getApplicationSubmissionContext();
       appContext = createApplicationSubmissionContext(appContext);
+      String YARN_NODE_LABEL_EXPRESSION = 
"zeppelin.interpreter.yarn.node.label.expression";
+      if(properties.containsKey(YARN_NODE_LABEL_EXPRESSION) && 
StringUtils.isNotEmpty(properties.getProperty(YARN_NODE_LABEL_EXPRESSION))) {

Review comment:
       > You can use `properties.getProperty(key, defaultValue)` to simplify it
   
   Yes, it's a good idea
   
   




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