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https://issues.apache.org/jira/browse/HDFS-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848964#action_12848964
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Sanjay Radia commented on HDFS-1052:
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There are no failover notions amongst the multiple NNs in this proposal (ie the
multiple NNs are *not* m+k failover); failover is separable and complementary
to this proposal.
However, multiple namenodes in a cluster will help with availability in the
sense that it allows one to isolate, say production apps from non-production
apps by giving them different namespaces and hence different NNs. Further with
this proposal one is likely to run multiple smaller NNs and hence startup will
be faster which of course helps availability of the system.
> HDFS scalability with multiple namenodes
> ----------------------------------------
>
> Key: HDFS-1052
> URL: https://issues.apache.org/jira/browse/HDFS-1052
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> HDFS currently uses a single namenode that limits scalability of the cluster.
> This jira proposes an architecture to scale the nameservice horizontally
> using multiple namenodes.
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