[HDFS-14067] Allow manual failover between standby and observer

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-12943, 3.3.0
• Target Version/s: HDFS-12943
• Hadoop Flags: Reviewed
• Assignee: Chao Sun
• Reporter: Chao Sun
• Created: 12/Nov/18 18:28
• Updated: 06/Jan/19 04:50
• Resolved: 24/Nov/18 21:58

Description

Currently if automatic failover is enabled in a HA environment, transition from standby to observer would be blocked:

[hdfs@*** hadoop-3.3.0-SNAPSHOT]$ bin/hdfs haadmin -transitionToObserver ha2
Automatic failover is enabled for NameNode at ****
Refusing to manually manage HA state, since it may cause
a split-brain scenario or other incorrect state.
If you are very sure you know what you are doing, please
specify the --forcemanual flag.

We should allow manual transition between standby and observer in this case.

Issue Links

• breaks: YARN-9178 TestRMAdminCli#testHelp is failing in trunk
• is duplicated by: HDFS-14068 Allow manual transition from Standby to Observer
• is related to: HDFS-13286 Add haadmin commands to transition between standby and observer
• is related to: HDFS-14059 Test reads from standby on a secure cluster with Configured failover