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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1973) HA: HDFS clients must handle namenode failover and switch over to the new active namenode.
Date Fri, 30 Sep 2011 22:09:45 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-1973:
---------------------------------

    Attachment: HDFS-1973-HDFS-1623.patch

Thanks a lot for the review, Todd. Here's a patch which addresses your latest comments.

bq. Yes, because unfortunately the Private annotation was added after the 0.20 release. If
it's problematic to keep around, we don't have to, but it seemed easy enough to maintain for
now.

That's fair. I've put it back.

bq. This code confuses me – isn't currentProxy a proxy object, whereas proxies.get(...)
is an AddressRpcProxyPair? Which is to say they're always un-equal?

Yep, good catch. Fixed.
                
> 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-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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