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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1973) HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
Date Mon, 26 Sep 2011 23:37:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115036#comment-13115036
] 

Aaron T. Myers commented on HDFS-1973:
--------------------------------------

bq. A general note: this failover proxy provider doesn't get passed enough info to choose
different configs based on the "logical URI". For example, if I have two clusters, foo and
bar I'd expect to be able to configure dfs.ha.namenodes.foo separately from dfs.ha.namenodes.bar
after setting both of dfs.client.failover.proxy.provider.foo|bar.

I've filed HDFS-2367 to address this issue.
                
> HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1973
>                 URL: https://issues.apache.org/jira/browse/HDFS-1973
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Suresh Srinivas
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-1973-HDFS-1623.patch, HDFS-1973-HDFS-1623.patch, hdfs-1973.0.patch
>
>
> During failover, a client must detect the current active namenode failure and switch
over to the new active namenode. The switch over might make use of IP failover or some thing
more elaborate such as zookeeper to discover the new active.

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