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https://issues.apache.org/jira/browse/KAFKA-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao resolved KAFKA-1069.
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Resolution: Fixed
Fix Version/s: 0.8
Assignee: Jun Rao
Thanks for the review. Committed to 0.8.
> MBean kafka.cluster.Partition report wrong UnderReplicated status
> -----------------------------------------------------------------
>
> Key: KAFKA-1069
> URL: https://issues.apache.org/jira/browse/KAFKA-1069
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Vladislav Pernin
> Assignee: Jun Rao
> Fix For: 0.8
>
> Attachments: KAFKA-1069.patch
>
>
> Happens on kafka-0.8.0-beta1.
> The MBean kafka.cluster.Partition shows an UnderReplicated status which is
> wrong.
> Let's take a simple example :
> - one topic named topictest
> - replication factor = 2
> - 3 nodes
> Output of kafka-list-topic.sh command :
> topic: topictest partition: 0 leader: 2 replicas: 3,2 isr:
> 2,3
> topic: topictest partition: 1 leader: 1 replicas: 1,3 isr:
> 1,3
> topic: topictest partition: 2 leader: 1 replicas: 2,1 isr:
> 1,2
> topic: topictest partition: 3 leader: 1 replicas: 3,1 isr:
> 1,3
> topic: topictest partition: 4 leader: 1 replicas: 1,2 isr:
> 1,2
> topic: topictest partition: 5 leader: 2 replicas: 2,3 isr:
> 2,3
> topic: topictest partition: 6 leader: 2 replicas: 3,2 isr:
> 2,3
> topic: topictest partition: 7 leader: 1 replicas: 1,3 isr:
> 1,3
> So everything is ok, each partition have one follower and the ISR size is 2.
> Node 1 which is leader of partition 1 :
> MBean "kafka.cluster":type="Partition",name="acorreler-1-UnderReplicated" = 0
> Node 3 which if a follower of partition 1 :
> "kafka.cluster":type="Partition",name="acorreler-1-UnderReplicated" = 1
> On each node, the MBean
> "kafka.server":type="ReplicaManager",name="UnderReplicatedPartitions" reports
> 0 which is correct.
> So it seems that the followers of a partition believe that their partitions
> replicates are under replicated.
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