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https://issues.apache.org/jira/browse/FLINK-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14713074#comment-14713074
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ASF GitHub Bot commented on FLINK-2399:
---------------------------------------

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

    https://github.com/apache/flink/pull/945#discussion_r37978132
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/configuration/Configuration.java ---
    @@ -54,8 +54,12 @@
        
     
        /** Stores the concrete key/value pairs of this configuration object. */
    -   private final HashMap<String, Object> confData;
    -   
    +   private final Map<String, Object> confData;
    +
    +   /** Stores the program version */
    +   public final String FLINK_VERSION = 
getClass().getPackage().getImplementationVersion() ==
    +           null ? "FLINK_TEST_VERSION" : 
getClass().getPackage().getImplementationVersion();
    --- End diff --
    
    What's the value of `FLINK_VERSION` if you execute a Flink job on a 
standalone cluster from your IDE using the `RemoteExecutionEnvironment`? Will 
it work?


> Fail when actor versions don't match
> ------------------------------------
>
>                 Key: FLINK-2399
>                 URL: https://issues.apache.org/jira/browse/FLINK-2399
>             Project: Flink
>          Issue Type: Improvement
>          Components: JobManager, TaskManager
>    Affects Versions: 0.9, master
>            Reporter: Ufuk Celebi
>            Assignee: Sachin Goel
>            Priority: Minor
>             Fix For: 0.10
>
>
> Problem: there can be subtle errors when actors from different Flink versions 
> communicate with each other, for example when an old client (e.g. Flink 0.9) 
> communicates with a new JobManager (e.g. Flink 0.10-SNAPSHOT).
> We can check that the versions match on first communication between the 
> actors and fail if they don't match.



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