[HDFS-3714] Disallow manual failover to already active NN when auto failover is enabled

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.0.0-alpha
• Component/s: auto-failover
• Labels: newbie
• Target Version/s: 2.0.2-alpha
• Assignee: Unassigned
• Reporter: Eli Collins
• Created: 24/Jul/12 02:54
• Updated: 19/Jan/17 18:49

Description

If nn1 is active and nn2 is standby "hdfs haadmin -failover nn2 nn1" says that failover to nn1 is successful even though nn1 is already active. When only manual failover is active, there is a check that tells users that the user can't failover to an already active service. We should have the same check for auto failover.

bash-4.1$ hdfs haadmin -failover nn2 nn1
Failover to NameNode at brut01.sf.cloudera.com/172.22.35.149:17020 successful
bash-4.1$ hdfs haadmin -failover nn2 nn1
Failover to NameNode at brut01.sf.cloudera.com/172.22.35.149:17020 successful
bash-4.1$ hdfs haadmin -failover nn2 nn1
Failover to NameNode at brut01.sf.cloudera.com/172.22.35.149:17020 successful