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https://issues.apache.org/jira/browse/STORM-1539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143663#comment-15143663
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Roshan Naik commented on STORM-1539:
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The attached profiler info related to the amount of time taken by ~45k
invocations each of Spout.nextTuple() and Bolt.execute() suggests a perf
boost of:
*Spout.nextTuple() :* 6953ms -> 5396ms = *~30%* improvement
*Bolt.execute() :* 5313ms -> 3687ms = *~ 44%* improvement
> 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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