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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1052) HDFS scalability with multiple namenodes
Date Tue, 23 Mar 2010 23:42:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848964#action_12848964
] 

Sanjay Radia commented on HDFS-1052:
------------------------------------

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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