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Date: Thu, 3 Jan 2013 19:48:12 +0000 (UTC)
From: "David Arthur (JIRA)" <jira@apache.org>
To: dev@kafka.apache.org
Message-ID: <JIRA.12619154.1354812529928.75704.1357242492530@arcas>
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Subject: [jira] [Commented] (KAFKA-657) Add an API to commit offsets
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    [ https://issues.apache.org/jira/browse/KAFKA-657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13543227#comment-13543227 ] 

David Arthur commented on KAFKA-657:
------------------------------------

We had talked about limiting the size of the metadata to 1k or something and making this configurable. My question is: where does this config belong, and how to get it into KafkaApis? Right now, I've added this config to KafkaConfig and have passed in the "config" variable from KafkaServer to KafkaApis.

Also, for the offset payloads, I'm opting to store them as a JSON object in ZooKeeper: {"offset": 42, "metadata": "foo"}
                
> Add an API to commit offsets
> ----------------------------
>
>                 Key: KAFKA-657
>                 URL: https://issues.apache.org/jira/browse/KAFKA-657
>             Project: Kafka
>          Issue Type: New Feature
>            Reporter: Jay Kreps
>              Labels: project
>         Attachments: KAFKA-657v1.patch, KAFKA-657v2.patch, KAFKA-657v3.patch, KAFKA-657v4.patch, KAFKA-657v5.patch, KAFKA-657v6.patch, KAFKA-657v7.patch
>
>
> Currently the consumer directly writes their offsets to zookeeper. Two problems with this: (1) This is a poor use of zookeeper, and we need to replace it with a more scalable offset store, and (2) it makes it hard to carry over to clients in other languages. A first step towards accomplishing that is to add a proper Kafka API for committing offsets. The initial version of this would just write to zookeeper as we do today, but in the future we would then have the option of changing this.
> This api likely needs to take a sequence of consumer-group/topic/partition/offset entries and commit them all.
> It would be good to do a wiki design on how this would work and consensus on that first.

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