[HDFS-6031] NN running newer software rejects loading the fsimage during rolling upgrade.

• 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: Haohui Mai
• Created: 27/Feb/14 22:52
• Updated: 01/Oct/14 19:56
• Resolved: 28/Feb/14 19:35

Description

During rolling upgrade, the standby NN that has a newer layout version will complain about that the fsimage is too old, and require starting the NN using the -upgrade option:

File system image contains an old layout version -55. An upgrade to version -56 is required.

However, -upgrade is disabled during rolling upgrade, thus it is impossible to restart the standby NN:

org.apache.hadoop.hdfs.protocol.RollingUpgradeException: Failed to upgrade namenode since a rolling upgrade is already in progress. Existing rolling upgrade info:
...

Issue Links

• relates to: HDFS-7176 The namenode usage message doesn't include "-rollingupgrade started"