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https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063714#comment-13063714
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Suresh Srinivas commented on HADOOP-7455:
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> What if the HA coordination system network is not reachable? For example if i
> use Zookeeper for switching the states. If Zookeeper network is not reachable
> then NN processes should go into which state.? In this sistuation, I feel we
> can have one api which will move the process state to Ideal (or) Neutral to
> avoid splitbrains.
I suggest reading the document in HDFS-1623. In case co-ordination device
(quorum device, in this case ZK) is not available, NN processes remain in the
state and no state change happens. I am not sure about what the ideal process
state that you mentioned is.
> 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, HDFS-7454.patch
>
>
> This jira introduces a protocol interface to be implemented by services that
> provide HA functionality.
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