Github user manuzhang commented on a diff in the pull request:

    https://github.com/apache/incubator-gearpump/pull/134#discussion_r97216223
  
    --- Diff: 
core/src/main/scala/org/apache/gearpump/cluster/AppDescription.scala ---
    @@ -139,4 +138,47 @@ case class ExecutorContext(
     case class ExecutorJVMConfig(
         classPath: Array[String], jvmArguments: Array[String], mainClass: 
String,
         arguments: Array[String], jar: Option[AppJar], username: String,
    -    executorAkkaConfig: Config = ConfigFactory.empty())
    \ No newline at end of file
    +    executorAkkaConfig: Config = ConfigFactory.empty())
    +
    +// Not using Enumeration here because upickle does not support it
    +sealed trait ApplicationStatus {
    +  def isTerminalStatus: Boolean
    +}
    +
    +object ApplicationStatus {
    +  case object Pending extends ApplicationStatus {
    +    override def toString: String = "pending"
    --- End diff --
    
    You may define this only once in the superclass and pass in the status 
string from subclasses.


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