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https://issues.apache.org/jira/browse/KAFKA-845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614716#comment-16614716
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Chris Johnson commented on KAFKA-845:
-------------------------------------
[~junrao], this regression has been unresolved from 0.8 all the way through 2.0
(unless perhaps I've missed something?) Any chance of getting this put back on
the roadmap?
> Re-implement shallow iteration on 0.8.1
> ---------------------------------------
>
> Key: KAFKA-845
> URL: https://issues.apache.org/jira/browse/KAFKA-845
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 0.8.1
> Reporter: Maxime Brugidou
> Priority: Major
>
> After KAFKA-732 we decided to not support the shallow iteration feature to
> speed up the 0.8 release.
> This severely impacts the performance for heavy mirroring between clusters.
> The MirrorMaker needs to decompress/recompress the data which actually triple
> the CPU compression cost in the data flow (initial compression + 2x
> compression for mirroring).
> It would be great to discuss a solution to re-implement the feature correctly.
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