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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7455) Introduce HA Service Protocol Interface
Date Tue, 12 Jul 2011 13:47:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063899#comment-13063899
] 

Uma Maheswara Rao G commented on HADOOP-7455:
---------------------------------------------

Hi Suresh,
 Thanks for incorporating the comments. :-) ...looks good to me.

  I was going through the solution document attached (HDFS-1623). It talks about the need
for Fencing, due to the chances of having two Active Namenodes at the same time (may be due
to a network partition or split brain condition). I am curious on what is your approach to
ensure that both Namenodes dont serve the clients at the same time & update the metadata.
An updated solution document which talks more on the fencing techniques will be appreciated.

In Section 9.1.1,
  With NFS - a fencing solution needs investigation.
 Whether we finalized any solution for this?


> 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, HDFS-7454.patch
>
>
> This jira introduces a protocol interface to be implemented by services that provide
HA functionality.

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