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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1064) NN Availability - umbrella Jira
Date Thu, 16 Dec 2010 20:17:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972195#action_12972195
] 

Sanjay Radia commented on HDFS-1064:
------------------------------------

Would users find the the use of HA NFS in a failover solution to be a showstopper? I agree
that it is somewhat embarrassing to say that HDFS failover depends on HA NFS.  The reason
I ask is that, HA NFS as a shared storage is one of the fastest way for us to develop a HA
solution.
Q. Do  users already have an NFS server that they can use for this purpose? For example at
Yahoo we use NFS as one of several "disks" for edits and image.

I don't see this as a final solution but merely a first step. A shared dual ported disk solution
will require more work esp for storage fencing. Using BackupNN I suspect is also  a little
bit more complicated than using shared storage.
(Btw as noted above , the AvatarNN uses NFS  as part of its controlled manual failover during
an upgrade. )

> NN Availability - umbrella Jira
> -------------------------------
>
>                 Key: HDFS-1064
>                 URL: https://issues.apache.org/jira/browse/HDFS-1064
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Sanjay Radia
>
> This is an umbrella jira for discussing availability of the HDFS NN and providing references
to other Jiras that improve its availability. This includes, but is not limited to, automatic
failover. 

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