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Posted to dev@kafka.apache.org by "Jun Rao (JIRA)" <ji...@apache.org> on 2013/10/08 18:14:42 UTC
[jira] [Closed] (KAFKA-1069) MBean kafka.cluster.Partition report
wrong UnderReplicated status
[ https://issues.apache.org/jira/browse/KAFKA-1069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jun Rao closed KAFKA-1069.
--------------------------
> 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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