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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1972) HA: Datanode fencing mechanism
Date Fri, 16 Dec 2011 04:45:31 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.txt

New patch addresses your comments. I changed the terminology from "untrusted" to "stale" throughout,
and inverted the polarity of the boolean in DatanodeDescriptor.
                
> 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, ha, name-node
>            Reporter: Suresh Srinivas
>            Assignee: Todd Lipcon
>         Attachments: hdfs-1972-v1.txt, hdfs-1972.txt, hdfs-1972.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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