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https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078480#comment-13078480
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Suresh Srinivas commented on HADOOP-7455:
-----------------------------------------

I am not sure why you needed to introduce Neutral state. When namenodes cannot 
talk to ZK, it continues to remain in the same state. If a namenode that was 
active, say NN1 loses connection to ZK and the other NN, say NN2, takes over as 
active, it performs fencing to keep the NN1 from accessing shared resources.

> Introduce HA Service Protocol Interface
> ---------------------------------------
>
>                 Key: HADOOP-7455
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7455
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: util
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HADOOP-7455.1.patch, HADOOP-7455.2.patch, 
> HADOOP-7455.3.patch, HADOOP-7455.4.patch, HDFS-7454.patch
>
>
> This jira introduces a protocol interface to be implemented by services that 
> provide HA functionality.

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