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From "Prashanth Menon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-376) expose different data to fetch requests from the follower replicas and consumer clients
Date Wed, 01 Aug 2012 00:41:34 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426249#comment-13426249
] 

Prashanth Menon commented on KAFKA-376:
---------------------------------------

Thanks for the comments, Jun.

1. Do we currently support this?  The fetch requests always check that the leader is on the
broker handling the request before actually reading from the log, so I'm not sure how a read
on a follower succeeds?

2.1, 2.2, 2.3, 2.4, 2.5 All valid.  Will upload new patch later this week.

I assume you mean, KAFKA-343?  I've been following it, and yes, it's grown quite large/complex
hahaha.  I'll definitely wait for that to get ironed out and committed.
                
> expose different data to fetch requests from the follower replicas and consumer clients
> ---------------------------------------------------------------------------------------
>
>                 Key: KAFKA-376
>                 URL: https://issues.apache.org/jira/browse/KAFKA-376
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Jun Rao
>         Attachments: KAFKA-376-DRAFT.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> Currently, the broker always uses highwatermark to calculate the available bytes to a
fetch request, no matter where the request is from. Instead, we should use highwatermark for
requests coming from real consumer clients and use logendoffset for requests coming from follower
replicas.

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