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

    https://github.com/apache/incubator-metron/pull/483#discussion_r106898305
  
    --- Diff: 
metron-platform/metron-parsers/src/main/java/org/apache/metron/parsers/bolt/ParserBolt.java
 ---
    @@ -132,6 +133,9 @@ public void execute(Tuple tuple) {
             Optional<List<JSONObject>> messages = 
parser.parseOptional(originalMessage);
             for (JSONObject message : 
messages.orElse(Collections.emptyList())) {
               message.put(Constants.SENSOR_TYPE, getSensorType());
    +          if(!message.containsKey(Constants.GUID)) {
    --- End diff --
    
    You should probably do this after the field transformations, so that if 
people provide their own GUID, they don't have one imposed on them.


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