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From "Jun Rao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-238) add a getTopicMetaData method in broker and expose it to producer
Date Thu, 05 Jan 2012 18:42:39 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180677#comment-13180677
] 

Jun Rao commented on KAFKA-238:
-------------------------------

We can potentially piggy-back auto topic creation on the getTopicMetaData api. If auto topic
creation is enabled and the broker sees no ZK data for a topic, the api will create the topic
first.
                
> add a getTopicMetaData method in broker and expose it to producer 
> ------------------------------------------------------------------
>
>                 Key: KAFKA-238
>                 URL: https://issues.apache.org/jira/browse/KAFKA-238
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: core
>            Reporter: Jun Rao
>
> We need a way to propagate the leader and the partition information to the producer so
that it can do load balancing and semantic partitioning. One way to do that is to have the
producer get the information from ZK directly. This means that the producer needs to maintain
a ZK session and has to subscribe to watchers, which can be complicated. An alternative approach
is to have the following api on the broker.
> TopicMetaData getTopicMetaData(String: topic)
> TopicMetaData {
>   Array[PartitionMetaData]: partitionsMetaData
> }
> PartitionMetaData {
>   Int: partitionId
>   String: leaderHostname
>   Int: leaderPort
> }
> Using this api, the producer can get the metadata about a topic during initial startup
or leadership change of a partition.

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