Disallow self failover
----------------------
Key: HDFS-3145
URL: https://issues.apache.org/jira/browse/HDFS-3145
Project: Hadoop HDFS
Issue Type: Bug
Components: ha
Reporter: Eli Collins
Assignee: Eli Collins
It is currently possible for users to make a standby NameNode failover to
itself and become active. We shouldn't allow this to happen in case operators
mistype and miss the fact that there are now two active NNs.
{noformat}
bash-4.1$ hdfs haadmin -ns ha-nn-uri -failover nn2 nn2
Failover from nn2 to nn2 successful
{noformat}
After the failover above, nn2 will be active.
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