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https://issues.apache.org/jira/browse/HDFS-2164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G resolved HDFS-2164.
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Resolution: Won't Fix
HDFS-1623 already have such machanism by keeping states
> Namenode supports Active and Standby modes; Standby Namenode should be able
> to able to take up the Active role dynamically, without losing any data.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-2164
> URL: https://issues.apache.org/jira/browse/HDFS-2164
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, hdfs-client, namenode
> Reporter: Justin Joseph
>
> Namenode should have the capability to play dual roles, either as Active or
> Standby, as HA Agent decides. The Standby Namenode should contain the
> instance of Backup Namenode inside. When HA Agent forces a switch over, the
> Backup Namenode instance should be turned to a normal Namenode instance.
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