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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7455) Introduce HA Service Protocol Interface
Date Tue, 12 Jul 2011 04:42:59 GMT

    [ 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:
-----------------------------------------

> 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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