Github user HeartSaVioR commented on the pull request:
https://github.com/apache/storm/pull/1346#issuecomment-211226737
@darionyaphet
Unfortunately, Storm doesn't guarantee exactly-once unless you use Trident
with appropriate Spout and State. Checkpointing doesn't guarantee exactly-once.
http://storm.apache.org/releases/1.0.0/State-checkpointing.html
http://storm.apache.org/releases/1.0.0/Trident-state.html
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