Dong Lin created KAFKA-4443:
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Summary: Controller should send UpdateMetadataRequest prior to
LeaderAndIsrRequest during failover
Key: KAFKA-4443
URL: https://issues.apache.org/jira/browse/KAFKA-4443
Project: Kafka
Issue Type: Bug
Reporter: Dong Lin
Assignee: Dong Lin
Currently in onControllerFailover(), controller will startup
replicaStatemachine and partitionStateMachine before invoking
sendUpdateMetadataRequest(controllerContext.liveOrShuttingDownBrokerIds.toSeq).
However, if a broker right after controller election, the LeaderAndIsrRequest
sent to follower partitions on this broker will all be ignored because broker
doesn't know the leaders are alive.
To fix this problem, in onControllerFailover(), controller should send
UpdateMetadataRequest to brokers after initializeControllerContext() but before
it starts replicaStatemachine and partitionStateMachine. The first
MetadatUpdateRequest will include list of live broker. Although it will not
include partition leader information, it is OK because we will always send
MetadataUpdateRequest again when we send LeaderAndIsrRequest during
replicaStateMachine.startup() and partitionStateMachine.startup().
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