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

    https://github.com/apache/twill/pull/13#discussion_r82036739
  
    --- Diff: 
twill-common/src/main/java/org/apache/twill/internal/Constants.java ---
    @@ -78,6 +78,15 @@ private Files() {
         }
       }
     
    +  /**
    +   * Constants for twill environment variable names.
    +   */
    +  public static final class Environments {
    --- End diff --
    
    They are initially used in EnvKeys to pass system env variables. But with 
the use of TwillRuntimeSpecification, they are no longer used as keys. They are 
used as constants in configuration or error messages so I move them to 
Constants class


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