[HDFS-5645] Support upgrade marker in editlog streams

• 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 Sze
• Reporter: Tsz-wo Sze
• Created: 09/Dec/13 07:41
• Updated: 10/Jan/14 06:08
• Resolved: 10/Jan/14 06:08

Description

During upgrade, a marker can be inserted into the editlog streams so that it is possible to roll back to the marker transaction.