haadmin failover command does not provide enough detail for when target NN is
not ready to be active
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Key: HDFS-3071
URL: https://issues.apache.org/jira/browse/HDFS-3071
Project: Hadoop HDFS
Issue Type: Improvement
Components: ha
Affects Versions: 0.24.0
Reporter: Philip Zeyliger
When running the failover command, you can get an error message like the
following:
{quote}
$ hdfs --config $(pwd) haadmin -failover namenode2 namenode1
Failover failed: xxx.yyy/1.2.3.4:8020 is not ready to become active
{quote}
Unfortunately, the error message doesn't describe why that node isn't ready to
be active. In my case, the target namenode's logs don't indicate anything
either. It turned out that the issue was "Safe mode is ON.Resources are low on
NN. Safe mode must be turned off manually.", but ideally the user would be told
that at the time of the failover.
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