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From "dhruba borthakur (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1972) HA: Datanode fencing mechanism
Date Fri, 02 Dec 2011 00:36:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161329#comment-13161329
] 

dhruba borthakur commented on HDFS-1972:
----------------------------------------

I recollect that we prevent primary namenode from issuing BLOCK_INVALIDATE commands for a
particular datanode until the time it has received a full block report from that datanode
(since the last failover event). But I will read proposal 3 in greater detail, 


                
> 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
>
> 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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