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From "Jitendra Nath Pandey (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1975) HA: Support for sharing the namenode state from active to standby.
Date Wed, 19 Oct 2011 01:13:10 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jitendra Nath Pandey updated HDFS-1975:
---------------------------------------

    Attachment: HDFS-1975-HA.patch

This is a very early version of the patch.
In this patch I am letting the datanode call to block if generation stamp is not up to date.
I will upload a patch very soon which won't block the call and instead queue the message.
The patch is not review ready yet, but indicates the approach being taken.

                
> HA: Support for sharing the namenode state from active to standby.
> ------------------------------------------------------------------
>
>                 Key: HDFS-1975
>                 URL: https://issues.apache.org/jira/browse/HDFS-1975
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Suresh Srinivas
>            Assignee: Jitendra Nath Pandey
>         Attachments: HDFS-1975-HA.patch, hdfs-1975.txt, hdfs-1975.txt
>
>
> To enable hot standby namenode, the standby node must have current information for -
namenode state (image + edits) and block location information. This jira addresses keeping
the namenode state current in the standby node. To do this, the proposed solution in this
jira is to use a shared storage to store the namenode state. 
> Note one could also build an alternative solution by augmenting the backup node. A seperate
jira could explore this.

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