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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:
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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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