Github user hmcl commented on the issue:
https://github.com/apache/storm/pull/1131
@jianbzhou you can get obtain at most once semantics by setting maxRetries
to zero. Here is the method to do so.
https://github.com/apache/storm/blob/master/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutConfig.java#L206
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