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https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078607#comment-13078607
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Justin Joseph commented on HADOOP-7455:
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@Suresh : I had mentioned that handling the network partitions using 'Neutral'
state is effective for an HA solution which uses ZK based failover + Data
Synchronization using Backup Node.
In the doc attached for HDFS-1623, it says 'It is important that only the
active NN responds to the client'. It achieves the same, but has dependency on
the fencing done to the shared storage; when a nonâactive NN tries to write to
the fenced shared storage it will fail & the response to client will indicate
failure.
In the Backup Node based approach, there is no shared storage. But still it
should be ensured that the clients talk to only one Active Namenode. Neutral
state is a very simple technique to achieve the same.
> 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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