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From "Jun Rao (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-238) add a getTopicMetaData method in broker and expose it to producer
Date Thu, 05 Jan 2012 18:40:39 GMT
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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