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https://issues.apache.org/jira/browse/KAFKA-513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457430#comment-13457430
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Neha Narkhede commented on KAFKA-513:
-------------------------------------
Thanks for volunteering Prashanth ! You can take it, I'm almost done with
KAFKA-499 and can check it in by tomorrow. That unblocks work on this JIRA.
> 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
> 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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