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From "Justin Joseph (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7455) Introduce HA Service Protocol Interface
Date Wed, 03 Aug 2011 06:53:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078607#comment-13078607
] 

Justin Joseph commented on HADOOP-7455:
---------------------------------------

@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 non‐active 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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