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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1972) HA: Datanode fencing mechanism
Date Thu, 01 Dec 2011 00:53:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160528#comment-13160528
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Suresh Srinivas commented on HDFS-1972:
---------------------------------------

My thoughts were a bit different from yours:
# I wanted to change heart beat response to from an array of commands to HeartbeatResponse
with set of commands in it.
# HeartbeatResponse would also have other information - to start with it will have the state
of the namenode. This will be used by Datanode node to handle active/standby transitions.

HeartbeatResponse also come in addition, with being able to pass other information in the
future (for example, current transactionID of the namenode etc.).

What do you think?
                
> 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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