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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1972) HA: Datanode fencing mechanism
Date Mon, 19 Dec 2011 23:49:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172742#comment-13172742
] 

Todd Lipcon commented on HDFS-1972:
-----------------------------------

I think I will actually integrate HDFS-2603 into this, since the issues are tightly linked.
(I have a new test case which illustrates the issue). I'll upload a new patch soon, but this
version is still worth reviewing.
                
> 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, 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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