Remove the watches/broker for new topics and partitions and change create topic
admin API to send start replica state change to all brokers
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Key: KAFKA-329
URL: https://issues.apache.org/jira/browse/KAFKA-329
Project: Kafka
Issue Type: Bug
Affects Versions: 0.8
Reporter: Neha Narkhede
Currently in 0.8, all brokers register a watch on /brokers/topics and
/brokers/topics/[topic] for all topics in a Kafka cluster. The watches are
required to discover new topics.
There is another way this can be achieved, as proposed here -
https://cwiki.apache.org/confluence/display/KAFKA/Kafka+replication+detailed+design+V2#KafkareplicationdetaileddesignV2-Createtopic
Basically, the create-topic admin command sends start-replica state change
request to all brokers in the assigned replicas list.
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