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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
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

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