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

    https://github.com/apache/storm/pull/2882#discussion_r227061504
  
    --- Diff: storm-core/src/jvm/org/apache/storm/command/AdminCommands.java ---
    @@ -104,6 +115,164 @@ public void printCliHelp(String command, PrintStream 
out) {
             }
         }
     
    +    /**
    +     * Print value in a human readable format.
    +     * @param value what to print.
    +     * @return a human readable string
    +     */
    +    public static String prettyPrint(TBase value) {
    +        StringBuilder builder = new StringBuilder();
    +        prettyPrint(value, 0, builder);
    +        return builder.toString();
    +    }
    +
    +    private static void println(StringBuilder out, int depth, Object 
value) {
    +        for (int i = 0; i < depth; i++) {
    +            out.append("\t");
    +        }
    +        out.append(value);
    +        out.append("\n");
    +    }
    +
    +    private static void prettyPrint(TBase value, int depth, StringBuilder 
out) {
    +        if (value == null) {
    +            println(out, depth,"null");
    +            return;
    +        }
    +        println(out, depth, "{");
    +        prettyPrintFields(value, depth + 1, out);
    +        println(out, depth, "}");
    +    }
    +
    +    private static void prettyPrintFields(TBase value, int depth, 
StringBuilder out) {
    +        for (Map.Entry<? extends TFieldIdEnum, FieldMetaData> entry : 
FieldMetaData.getStructMetaDataMap(value.getClass()).entrySet()) {
    +            TFieldIdEnum key = entry.getKey();
    +            if (!value.isSet(key)) {
    +                println(out, depth, key.getFieldName() + ": not set");
    --- End diff --
    
    Simply make this empty "" String result or `{}`. not set is not exactly 
parsable json


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