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

    https://github.com/apache/storm/pull/1919#discussion_r99882134
  
    --- Diff: 
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java
 ---
    @@ -319,8 +320,10 @@ private boolean 
emitTupleIfNotEmitted(ConsumerRecord<K, V> record) {
                     } else {
                         collector.emit(tuple, msgId);
                     }
    -                emitted.add(msgId);
    -                numUncommittedOffsets++;
    +                if(!consumerAutoCommitMode){//only need to track in 
none-AutoCommitMode
    +                    emitted.add(msgId);
    --- End diff --
    
    It might be good to check if there are any ackers before adding the tuple 
to emitted. Otherwise people who are using auto commit and no ackers will run 
into OOME when emitted gets sufficiently large.


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