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From "Tony Valderrama (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-976) Hot Standby for NameNode
Date Tue, 08 Mar 2011 13:21:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tony Valderrama updated HDFS-976:

    Attachment: 0001-0.20.3_rc2-AvatarNode.patch

This is a patch against hadoop-0.20.3-rc2, which was extracted from facebook's hadoop-20-warehouse
release in December 2010 (plus some bugfixes).  This also includes example startup scripts.
 One major bug is that the hdfs cluster must run with permissions disabled (dfs.permissions=false)
because the standby avatar node doesn't use the login credentials when attempting to enter
safe mode.  Otherwise, it seems to function correctly.

> Hot Standby for NameNode
> ------------------------
>                 Key: HDFS-976
>                 URL: https://issues.apache.org/jira/browse/HDFS-976
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: Dmytro Molkov
>         Attachments: 0001-0.20.3_rc2-AvatarNode.patch, AvatarNode.20.patch, AvatarNode.patch,
AvatarNodeDescription.txt, AvatarPatch.2.patch
> This is a place holder to share our code and experiences about implementing a Hot Standby
for the HDFS NameNode for hadoop 0.20. 

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