add a getTopicMetaData method in broker and expose it to producer
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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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