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https://issues.apache.org/jira/browse/BEAM-9440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057802#comment-17057802
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Guenter Hesse commented on BEAM-9440:
-------------------------------------

When we started the work on this topic Apache Apex was a project still under 
development. Unfortunately, shortly after submitting the final version of the 
paper, we found out that the project was abandoned. So I totally agree with 
you, Apex was/is not the best choice as a third system to compare, although it 
is still listed as a supported system/runner:

[https://beam.apache.org/documentation/runners/capability-matrix/] 

However, this page also shows Apache Gearpump and JStorm, both of which seem to 
be retired by now, too. But that is probably a different topic, i.e., the 
question when to remove abandoned projects from this matrix.

Regarding the Google Summer of Code project: that sounds very interesting to 
me. In order to pass information to our students, could you please give me some 
further details on how a collaboration would look like? You can send me an 
email if that is convenient for you: 
[[email protected]|mailto:[email protected]] Thanks!

> Performance Issues with Beam Runners compared with Native Systems
> -----------------------------------------------------------------
>
>                 Key: BEAM-9440
>                 URL: https://issues.apache.org/jira/browse/BEAM-9440
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-apex, runner-flink, runner-spark
>            Reporter: Soumabrata Chakraborty
>            Priority: Major
>
> While doing a performance evaluation of Apache Beam with Spark Runner - I 
> found that even for a simple word count problem on a text file – Beam with 
> Spark runner was slower by a factor of 5 times as compared to Spark for a 
> dataset as small as 14 GB.
> You will find more details on this evaluation here - 
> [https://github.com/soumabrata-chakraborty/spark-vs-beam/blob/master/README.md]
> I also came across this analysis called _**Quantitative Impact Evaluation of 
> an Abstraction Layer for Data Stream Processing Systems_ 
> ([https://arxiv.org/pdf/1907.08302.pdf] / 
> [https://ieeexplore.ieee.org/document/8884832])
> According to it, the observation was that for most scenarios the slowdown was 
> at least a factor of 3 with the worse case being a factor of 58!
> While it is understood that an abstraction layer would come with some 
> performance cost - the current performance cost seems to be very high.



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