[jira] [Commented] (KAFKA-2202) ConsumerPerformance reports a throughput much higher than the actual one

["Manikumar Reddy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585040#comment-14585040 ] 

Manikumar Reddy commented on KAFKA-2202:
----------------------------------------

Created reviewboard https://reviews.apache.org/r/35437/diff/
 against branch origin/trunk

> ConsumerPerformance reports a throughput much higher than the actual one
> ------------------------------------------------------------------------
>
>                 Key: KAFKA-2202
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2202
>             Project: Kafka
>          Issue Type: Bug
>          Components: tools
>    Affects Versions: 0.8.2.0
>            Reporter: Micael Capitão
>            Priority: Minor
>         Attachments: KAFKA-2202.patch
>
>
> I've been using the kafka.tools.ConsumerPerformance tool for some benchmarking until in one of my tests I got a throughput much higher than the supported by my network interface.
> The test consisted in consuming around ~4900 MB from one topic using one consumer with one thread. The reported throughput reported was ~1400 MB/s which surpasses the 10 Gbps of the network. The time for the whole operation was ~8 seconds, which should correspond to a throughput of ~612 MB/s.
> Digging the ConsumerPerformance code, I've found this at line 73:
> {code:java}
> val elapsedSecs = (endMs - startMs - config.consumerConfig.consumerTimeoutMs) / 1000.0
> {code}
> The {{consumerTimeoutMs}} defined as 5000 at line 131 is always considered leading to wrong results.
> This bug seems to be related to this one [https://issues.apache.org/jira/browse/KAFKA-1828]



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