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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7455) Introduce HA Service Protocol Interface
Date Tue, 02 Aug 2011 22:40:27 GMT

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

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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