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https://issues.apache.org/jira/browse/HDFS-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-1972.
-------------------------------
Resolution: Fixed
Fix Version/s: HA branch (HDFS-1623)
Hadoop Flags: Reviewed
Committed to HA branch. Thanks for the reviews
> 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
> Fix For: HA branch (HDFS-1623)
>
> Attachments: hdfs-1972-v1.txt, hdfs-1972.txt, hdfs-1972.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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