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https://issues.apache.org/jira/browse/KAFKA-454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15979525#comment-15979525
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Guozhang Wang commented on KAFKA-454:
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Thanks for pointing out.
> ProducerSendThread calls ListBuffer.size a whole bunch. That is a O(n)
> operation
> --------------------------------------------------------------------------------
>
> Key: KAFKA-454
> URL: https://issues.apache.org/jira/browse/KAFKA-454
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.7.1, 0.7.2, 0.8.0
> Environment: NA
> Reporter: Matthew Rathbone
> Priority: Minor
>
> So there are various statements throughout the async code that call
> 'events.size', mostly for debugging purposes.
> Problem is that this call is O(n), so it could add up if the batch size is
> high. (it's a ListBuffer)
> I see this in at least ProducerSendThread, likely more. Will factor this out
> myself soon when I start hacking on the project, just wanted to put this
> somewhere.
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