Github user satishd commented on the pull request: https://github.com/apache/storm/pull/1072#issuecomment-196685078 Triggered results piggyback on the incoming tuples to send those results to the downstream. When there are no batch tuples then these triggers would wait. Filed [STORM-1627](https://issues.apache.org/jira/browse/STORM-1627) to enhance this for avoiding piggybacking on incoming tuples.
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