[
https://issues.apache.org/jira/browse/AMBARI-15506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Henning Kropp updated AMBARI-15506:
-----------------------------------
Attachment: AMBARI-15506_regex
Finally added a regex test to see if {{dfs.namenode.shared.edits.dir}} ends
with the possible nameservice.
Expected result:
{code}
>>> hdfs_site = {}
>>> print get_nameservice(hdfs_site)
None
>>> hdfs_site['dfs.nameservices'] = 'a,b,c'
>>> print get_nameservice(hdfs_site)
a
>>> hdfs_site['dfs.namenode.shared.edits.dir'] =
>>> 'http://host-a:8485;host-b:8485;host-c:8485/b'
>>> print get_nameservice(hdfs_site)
b
>>> hdfs_site['dfs.nameservices'] = 'a,c,b'
>>> print get_nameservice(hdfs_site)
b
>>> hdfs_site['dfs.nameservices'] = 'a,c'
>>> print get_nameservice(hdfs_site)
a
{code}
> 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
> Assignee: Henning Kropp
> Fix For: 2.4.0
>
> Attachments: AMBARI-15506, AMBARI-15506_1, AMBARI-15506_2,
> AMBARI-15506_3, AMBARI-15506_regex, namenode_ha_utils.py
>
>
> 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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