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

    https://github.com/apache/flink/pull/1903#discussion_r60728363
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/jobgraph/InputFormatVertex.java
 ---
    @@ -64,13 +65,19 @@ public void initializeOnMaster(ClassLoader loader) 
throws Exception {
                }
                
                // instantiate, if necessary
    -           InputFormat<?, ?> inputFormat;
    +           InputFormat<?, ?> inputFormat = null;
                try {
                        inputFormat = 
wrapper.getUserCodeObject(InputFormat.class, loader);
                }
                catch (Throwable t) {
                        throw new Exception("Instantiating the InputFormat (" + 
formatDescription + ") failed: " + t.getMessage(), t);
                }
    +           finally{
    +                   // close the instantiated resources before returning
    +                   if(inputFormat != null && inputFormat instanceof 
RichInputFormat) {
    --- End diff --
    
    `inputFormat.configure()` has not been called yet. Why are you closing it?


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