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https://issues.apache.org/jira/browse/KAFKA-513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528408#comment-13528408
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Neha Narkhede commented on KAFKA-513:
-------------------------------------
I think we cannot release without this functionality since it will be a
debugging nightmare if we were to hit any leader election bug post 0.8
deployment. I'm performance testing 0.8 right now, and found another bug that
randomly fails produce requests because the leader election hasn't
completed/started for a certain partition at a certain time. If we had this
feature, that effort would be greatly simplified
> Add state change log to Kafka brokers
> -------------------------------------
>
> Key: KAFKA-513
> URL: https://issues.apache.org/jira/browse/KAFKA-513
> Project: Kafka
> Issue Type: Sub-task
> Affects Versions: 0.8
> Reporter: Neha Narkhede
> Assignee: Swapnil Ghike
> Priority: Blocker
> Labels: replication, tools
> Fix For: 0.8
>
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> Once KAFKA-499 is checked in, every controller to broker communication can be
> modelled as a state change for one or more partitions. Every state change
> request will carry the controller epoch. If there is a problem with the state
> of some partitions, it will be good to have a tool that can create a timeline
> of requested and completed state changes. This will require each broker to
> output a state change log that has entries like
> [2012-09-10 10:06:17,280] broker 1 received request LeaderAndIsr() for
> partition [foo, 0] from controller 2, epoch 1
> [2012-09-10 10:06:17,350] broker 1 completed request LeaderAndIsr() for
> partition [foo, 0] from controller 2, epoch 1
> On controller, this will look like -
> [2012-09-10 10:06:17,198] controller 2, epoch 1, initiated state change
> request LeaderAndIsr() for partition [foo, 0]
> We need a tool that can collect the state change log from all brokers and
> create a per-partition timeline of state changes -
> [foo, 0]
> [2012-09-10 10:06:17,198] controller 2, epoch 1 initiated state change
> request LeaderAndIsr()
> [2012-09-10 10:06:17,280] broker 1 received request LeaderAndIsr() from
> controller 2, epoch 1
> [2012-09-10 10:06:17,350] broker 1 completed request LeaderAndIsr() from
> controller 2, epoch 1
> This JIRA involves adding the state change log to each broker and adding the
> tool to create the timeline
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