Guozhang Wang created KAFKA-1020:
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Summary: Remove getAllReplicasOnBroker from KafkaController
Key: KAFKA-1020
URL: https://issues.apache.org/jira/browse/KAFKA-1020
Project: Kafka
Issue Type: Bug
Reporter: Guozhang Wang
Assignee: Guozhang Wang
Today KafkaController call getAllReplicasOnBroker on broker failure and new
broker start up to get all the replicas that broker is holding (or suppose to
hold). This function actually issue a read on each topic's partition znodes.
With large number of topic/partitions this could seriously increase the latency
of handling broker failure and new broker startup.
On the other hand, ControllerContext maintains a partitionReplicaAssignment
cache, which is designed to keep the most updated partition replica assignment
according to ZK. So instead of reading from ZK, we could just read from the
local cache, given that partitionReplicaAssignment is guaranteed to be
up-to-date.
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