Guozhang Wang created KAFKA-1483:
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Summary: Split Brain about Leader Partitions
Key: KAFKA-1483
URL: https://issues.apache.org/jira/browse/KAFKA-1483
Project: Kafka
Issue Type: Bug
Reporter: Guozhang Wang
Assignee: Jun Rao
Fix For: 0.9.0
Today in the server there are two places storing the leader partition info:
1) leaderPartitions list in the ReplicaManager.
2) leaderBrokerIdOpt in the Partition.
1) is used as the ground truth to decide if the server is the current leader
for serving requests; 2) is used as the ground truth for reporting leader
counts metrics, etc and for the background Shrinking-ISR thread to decide which
partition to check. There is a risk that these two ground truth caches are not
consistent, and we'd better only make one of them as the ground truth.
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