[HDFS-2164] Namenode supports Active and Standby modes; Standby Namenode should be able to able to take up the Active role dynamically, without losing any data.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: datanode, hdfs-client, namenode
• Assignee: Unassigned
• Reporter: Justin Joseph
• Created: 19/Jul/11 12:03
• Updated: 22/Feb/13 11:01
• Resolved: 22/Feb/13 11:01

Description

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.