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https://issues.apache.org/jira/browse/KAFKA-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473716#comment-13473716
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Jay Kreps commented on KAFKA-557:
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I verified that this fixes KAFKA-562
> Replica fetch thread doesn't need to recompute message id
> ---------------------------------------------------------
>
> Key: KAFKA-557
> URL: https://issues.apache.org/jira/browse/KAFKA-557
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8
> Reporter: Jun Rao
> Priority: Blocker
> Labels: bugs
> Attachments: KAFKA-557.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> With kafka-506, the leader broker computes the logical id for each message
> produced. This could involve decompressing and recompressing messages, which
> are expensive. When data is replicated from the leader to the follower, we
> could avoid recomputing the logical message id since it's the same.
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