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https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858371#action_12858371
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Eli Collins commented on HDFS-1064:
-----------------------------------
Hey Daniel,
Failing the namenode over from one host to another that also has access to the
latest image and edit log requires shared storage. Whether or not this shared
storage is a single point of failure is orthogonal to whether the storage is
made available via nfs or a lun (that's used to host a clustered file system).
Many storage systems use redundant disks, power, network interfaces, multi-path
IO etc to make the shared storage they export highly available - the underlying
storage system more than the protocol used to access it will determine your
availability.
Note that for future releases the shared storage doesn't strictly need to be as
or more available than the namenode host: there's been work on trunk to handle
flaky dfs.name.dirs.
Thanks,
Eli
> 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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