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https://issues.apache.org/jira/browse/STORM-1539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143865#comment-15143865
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ASF GitHub Bot commented on STORM-1539:
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Github user satishd commented on the pull request:
https://github.com/apache/storm/pull/1101#issuecomment-183144295
+1
> Improve Storm ACK-ing performance
> ---------------------------------
>
> Key: STORM-1539
> URL: https://issues.apache.org/jira/browse/STORM-1539
> Project: Apache Storm
> Issue Type: Bug
> Reporter: Roshan Naik
> Assignee: Roshan Naik
> Attachments: after.png, before.png
>
>
> Profiling a simple speed of light topology, shows that a good chunk of time
> of the SpoutOutputCollector.emit() is spent in the clojure reduce()
> function.. which is part of the ACK-ing logic.
> Re-implementing this reduce() logic in java gives a big performance boost in
> both in the Spout.nextTuple() and Bolt.execute()
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