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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2839) Nameservice id in file uri could cause issues
Date Wed, 25 Jan 2012 03:40:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192842#comment-13192842
] 

Todd Lipcon commented on HDFS-2839:
-----------------------------------

For #1 above, you could configure the "logical URI" of the HA-ified cluster to match exactly
the hostname of the non-HA cluster.

For #2, I don't see any way around it -- you need some way of finding the hosts... unless
you are proposing a VIP based client failover approach here?
                
> Nameservice id in file uri could cause issues
> ---------------------------------------------
>
>                 Key: HDFS-2839
>                 URL: https://issues.apache.org/jira/browse/HDFS-2839
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>
> There might be two issues with having a nameservice id in fully qualified paths of the
files.
> 1) Some applications might be storing the fully qualified paths. They will have hostnames
from pre-ha installations, and they might break after the failover.
> 2) The fully qualified path from an ha cluster, won't be usable from a different cluster
that doesn't know about that particular namespace id.

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