[HDFS-5753] Add new NN startup options for downgrade and rollback using upgrade marker

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-5535 (Rolling upgrades)
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Tsz Wo Nicholas Sze
• Reporter: Tsz Wo Nicholas Sze
• Created: 10/Jan/14 06:15
• Updated: 27/Jan/14 07:39
• Resolved: 21/Jan/14 02:40

Description

Namenode could be started up with -upgrade / -rollback. The -rollback option will restore the data using the previous directory. New options are needed for downgrade and rollback using the upgrade marker.

Issue Links

• is depended upon by: HDFS-5778 Document new commands and parameters for improved rolling upgrades