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