jerrypeng commented on a change in pull request #4174: [go function] support 
localrun and cluster mode for go function
URL: https://github.com/apache/pulsar/pull/4174#discussion_r280029662
 
 

 ##########
 File path: 
pulsar-functions/runtime/src/main/java/org/apache/pulsar/functions/runtime/RuntimeUtils.java
 ##########
 @@ -89,31 +91,180 @@
             if (StringUtils.isNotEmpty(extraDependenciesDir)) {
                 args.add("PYTHONPATH=${PYTHONPATH}:" + extraDependenciesDir);
             }
+        } else if (instanceConfig.getFunctionDetails().getRuntime() == 
Function.FunctionDetails.Runtime.GO) {
+            //no-op
         }
 
         return args;
     }
 
+    /**
+     *
+     * Different from python and java function, Go function uploads a complete 
executable file(including:
+     * instance file + user code file). Its parameter list is provided to the 
broker in the form of a yaml file,
+     * the advantage of this approach is that backward compatibility is 
guaranteed.
 
 Review comment:
   @sijie @wolfstudy yup you can pass in the instance config 
```--instance-config <config-content>``` as a json string or as individual 
arguments:
   
   ```
   --instanceId <instanceId> --functionDetails <functionDetails> ...
   ```
   
   either way is fine with me.  

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