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

    https://github.com/apache/storm/pull/2147#discussion_r119404574
  
    --- Diff: 
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java
 ---
    @@ -170,10 +182,13 @@ private void initialize(Collection<TopicPartition> 
partitions) {
                     final long fetchOffset = doSeek(tp, committedOffset);
                     setAcked(tp, fetchOffset);
                 }
    -            initialized = true;
    +
    +            task.start();
    --- End diff --
    
    Since this is invoked from `onPartitionsAssigned`, the isComplete is going 
to return true as soon as onPartitionsRevoked is invoked after partition 
assignment right ?  
    
    The `onPartitionsRevoked` could wait for message.timeout.secs so that 
in-flight messages are acked/failed and then commit the offsets before 
returning to minimize the duplicates. May be this is what you wanted the 
ConsumerRebalanceHandlerTask to handle via isCompleted but it does not seem to 
do that currently.


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