[jira] [Created] (AMBARI-15169) namenode_ha_utils.py returns sometimes Active NNs as emtpy set, and Stand-by NN as a set of 2 NNs in multi-homed environment

["Jayush Luniya (JIRA)" <ji...@apache.org>]

Jayush Luniya created AMBARI-15169:
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             Summary: namenode_ha_utils.py returns sometimes Active NNs as emtpy set, and Stand-by NN as a set of 2 NNs in multi-homed environment
                 Key: AMBARI-15169
                 URL: https://issues.apache.org/jira/browse/AMBARI-15169
             Project: Ambari
          Issue Type: Bug
          Components: stacks
    Affects Versions: 2.2.0
            Reporter: Jayush Luniya
            Assignee: Jayush Luniya
             Fix For: 2.2.2



Steps to Reproduce:
- Setup multi-homed cluster 
- Upgrade from Ambari 1.7 to Ambari-2.0.2
- Upgrade from Ambari 2.0.2 to Ambari 2.2.0
- Try starting Hive Server2 and it fails saying no Active NN

This happens because we optimized to use webhdfs by default instead of hadoop jar calls.
https://issues.apache.org/jira/browse/AMBARI-11347

Fix:
Set a custom hdfs-site property "ambari.namenode.hosts" that provides the mapping of namenodes to hosts.
For example I set the custom property to
{code}
"ambari.namenode.hosts" : "{ 'nn1' : 'jay-homed-1' , 'nn2' : 'jay-homed-2' }"
{code}
For Non-HA, this should be set to the following
{code]
"ambari.namenode.hosts" : "{ 'nn' : 'jay-homed-1' }"
{code}



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