[HDFS-7302] namenode -rollingUpgrade downgrade may finalize a rolling upgrade

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha1
• Component/s: namenode
• Labels: document hdfs
• Target Version/s: 2.6.0
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Remove "downgrade" from "namenode -rollingUpgrade" startup option since it may incorrectly finalize an ongoing rolling upgrade.

• Assignee: Kai Sasaki
• Reporter: Tsz-wo Sze
• Created: 28/Oct/14 20:08
• Updated: 12/May/16 18:12
• Resolved: 03/Mar/15 02:06

Description

The namenode startup option "-rollingUpgrade downgrade" is originally designed for downgrading cluster. However, running "namenode -rollingUpgrade downgrade" with the new software could result in finalizing the ongoing rolling upgrade.

Issue Links

• relates to: HDFS-7842 Blocks missed while performing downgrade immediately after rolling back the cluster.
• relates to: HDFS-8110 Remove unsupported 'hdfs namenode -rollingUpgrade downgrade' from document
• relates to: HDFS-7230 Add rolling downgrade documentation