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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1972) HA: Datanode fencing mechanism
Date Fri, 02 Dec 2011 01:36:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1972:
------------------------------

    Attachment: hdfs-1972-v1.txt

Here's some initial work on this JIRA - the NNs return their HA state in the heartbeat, and
the DNs use that to determine which is active. I may break this out to a separate JIRA for
commit so that the patches are manageable to review.

Still need to implement the rest of the above proposal.
                
> HA: Datanode fencing mechanism
> ------------------------------
>
>                 Key: HDFS-1972
>                 URL: https://issues.apache.org/jira/browse/HDFS-1972
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, name-node
>            Reporter: Suresh Srinivas
>            Assignee: Todd Lipcon
>         Attachments: hdfs-1972-v1.txt
>
>
> In high availability setup, with an active and standby namenode, there is a possibility
of two namenodes sending commands to the datanode. The datanode must honor commands from only
the active namenode and reject the commands from standby, to prevent corruption. This invariant
must be complied with during fail over and other states such as split brain. This jira addresses
issues related to this, design of the solution and implementation.

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