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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1064) NN Availability - umbrella Jira
Date Mon, 19 Apr 2010 03:09:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858371#action_12858371
] 

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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