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From "Daniel Einspanjer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1064) NN Availability - umbrella Jira
Date Mon, 19 Apr 2010 00:04:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858360#action_12858360
] 

Daniel Einspanjer commented on HDFS-1064:
-----------------------------------------

I've noticed that for the current recommended configuration and for the two HDFS HA strategies
I've seen, they all involve writing the NN data to NFS shared storage.  This still seems to
be a single point of failure to me.  If the NFS becomes unreachable or if the NFS filer must
be taken down for maintenance, where does that leave the cluster?

I was recently investigating the possibility of using RHEL GFS or something similar to provide
a high availability storage location for the NN data.  It was suggested that I not take this
path so I'm just trying to understand why it isn't necessary.

> 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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