rabbah commented on a change in pull request #3215: adding namePrefix config to 
ContainerArgsConfig
URL: 
https://github.com/apache/incubator-openwhisk/pull/3215#discussion_r165653638
 
 

 ##########
 File path: core/invoker/src/main/scala/whisk/core/invoker/Invoker.scala
 ##########
 @@ -130,8 +130,7 @@ object Invoker {
         if (config.zookeeperHosts.startsWith(":") || 
config.zookeeperHosts.endsWith(":")) {
           abort(s"Must provide valid zookeeper host and port to use dynamicId 
assignment (${config.zookeeperHosts})")
         }
-        val invokerName = cmdLineArgs.name.getOrElse(config.invokerName)
-        if (invokerName.trim.isEmpty) {
+        if (invokerName.isEmpty || invokerName.get.trim.isEmpty) {
 
 Review comment:
   this check is only done when the id is missing - so it is possible to have a 
name that is an empty (`""` or `" "`) string accepted as the invoker name (only 
`Option(null) == None`).
   
   i don't think that's intended.

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