[jira] [Created] (AMBARI-15506) Support for multiple Namservices in namenode_ha_utils.py

["Henning Kropp (JIRA)" <ji...@apache.org>]

Henning Kropp created AMBARI-15506:
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             Summary: Support for multiple Namservices in namenode_ha_utils.py
                 Key: AMBARI-15506
                 URL: https://issues.apache.org/jira/browse/AMBARI-15506
             Project: Ambari
          Issue Type: Bug
          Components: ambari-agent
    Affects Versions: trunk
         Environment: HDFS HA
            Reporter: Henning Kropp


Currently Ambari does not support the definition of multiple Nameservices. It is always assumed {{hdfs_site\['dfs.nameservices'\]}} is just a string defining one nameservice.

Multiple nameservices can be configured for exmaple to support seamless distcp between two HA clusters. The nameservices are defined as a comma separated list in {{hdfs_site\['dfs.nameservices'\]}}. 

This patch introduces the method {{get_nameservice(hdfs_site)}}, which splits the value into in an array and identifies the nameservice for the current cluster with what is set in {{hdfs_site\['dfs.namenode.shared.edits.dir'\]}}. By default the first nameservice is returned or empty.

To verify the current namservice it would be preferred to use {{fs.defaultFS}} in {{core-site}}, but getting this config into {{namenode_ha_utils.py}} seems more involved.



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