[jira] [Resolved] (KAFKA-1483) Split Brain about Leader Partitions

["Neha Narkhede (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neha Narkhede resolved KAFKA-1483.
----------------------------------

    Resolution: Fixed
      Assignee: Sriharsha Chintalapani  (was: Neha Narkhede)

Sorry about the delay. Pushed the latest reviewed patch to trunk.

> Split Brain about Leader Partitions
> -----------------------------------
>
>                 Key: KAFKA-1483
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1483
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Guozhang Wang
>            Assignee: Sriharsha Chintalapani
>              Labels: newbie++
>             Fix For: 0.9.0
>
>         Attachments: KAFKA-1483.patch, KAFKA-1483_2014-07-16_11:07:44.patch
>
>
> 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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