Dong Lin created KAFKA-4415:
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Summary: Reduce time to create and send MetadataUpdateRequest
Key: KAFKA-4415
URL: https://issues.apache.org/jira/browse/KAFKA-4415
Project: Kafka
Issue Type: Bug
Reporter: Dong Lin
As of current implementation, when controller receives
ControlledShutdownRequest, it will 1) for every broker in the cluster, for
every partition on the broker which wants to shutdown, create an instance of
PartitionStateInfo and add it to
ControllerBrokerRequestBatch.,updateMetadataRequestMap; and 2) for every
broker, for every follower partitions on the broker which wants to shutdown,
send one MetadataUpdateRequst to that broker.
In order to shutdown a broker, the controller will need to instantiate
O(partitionNum * brokerNum) PartitionStateInfo and send O(partitionNum *
brokerNum) partitionStateInfo. This is not efficient. The broker should only
need to instantiate O(partitionNum) PartitionStateInfo and send O(brokerNum)
MetadataUpdateRequest.
Micro-benchmark results show that this optimization can reduce the time of
processing ControlledShutdownRequest by 30%.
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