[HDFS-5869] When rolling upgrade is in progress, NN should only create checkpoint right before the 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 Sze
• Reporter: Tsz-wo Sze
• Created: 03/Feb/14 15:57
• Updated: 07/Feb/14 02:22
• Resolved: 07/Feb/14 02:22

Description

• When starting rolling upgrade, NN should create a checkpoint before it writes the upgrade marker edit log transaction.
• When rolling upgrade is in progress, NN should reject saveNamespace rpc calls. Further, if NN restarts, it should create a checkpoint only right before the upgrade marker.