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https://issues.apache.org/jira/browse/KAFKA-813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607697#comment-13607697
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Jun Rao commented on KAFKA-813:
-------------------------------

Thanks for patch v2. Some more comments.

20. PartitionStateMachine.initializeLeaderAndIsrForPartition(): why is the 
following line removed?
          partitionState.put(topicAndPartition, OnlinePartition)

21. PartitionNoReplicaOnlineException seems long. Is it better to use 
NoReplicaOnlineException?

22. KafkaController: To compute the gauge OfflinePartitionsCount, we need to 
synchronize on controller lock.


                
> Minor cleanup in Controller
> ---------------------------
>
>                 Key: KAFKA-813
>                 URL: https://issues.apache.org/jira/browse/KAFKA-813
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8
>            Reporter: Swapnil Ghike
>            Assignee: Swapnil Ghike
>            Priority: Blocker
>              Labels: kafka-0.8
>             Fix For: 0.8
>
>         Attachments: kafka-813-v1.patch, kafka-813-v2.patch
>
>
> Before starting work on delete topic support, uploading a patch first to 
> address some minor hiccups that touch a bunch of files:
> 1. Change PartitionOfflineException to PartitionUnavailableException because 
> in the partition state machine we mark a partition offline when its leader is 
> down, whereas the PartitionOfflineException is thrown when all the assigned 
> replicas of the partition are down.
> 2. Change PartitionOfflineRate to UnavailablePartitionRate
> 3. Remove default leader selector from partition state machine's 
> handleStateChange. We can specify null as default when we don't need to use a 
> leader selector.
> 4. Include controller info in the client id of LeaderAndIsrRequest.
> 5. Rename controllerContext.allleaders to something more meaningful - 
> partitionLeadershipInfo.
> 6. We don't need to put partition in OnlinePartition state in partition state 
> machine initializeLeaderAndIsrForPartition, the state change occurs in 
> handleStateChange.
> 7. Add todo in handleStateChanges
> 8. Left a comment above ReassignedPartitionLeaderSelector that reassigned 
> replicas are already in the ISR (this is not true for other leader 
> selectors), renamed the vals in the selector.

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