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https://issues.apache.org/jira/browse/AMBARI-24961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761733#comment-16761733
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Robert Levas commented on AMBARI-24961:
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[~akhilsnaik]... In order for {{{{hostname}}}} to resolve to something a
variable needs to be defined in the context named {{hostname}}. This is
typically done in the params.py or params_linux.py file. See
[https://github.com/hortonworks/hdp_ambari_definitions/blob/AMBARI-2.7-maint/src/main/resources/stacks/HDP/3.0/services/HBASE/package/scripts/params_linux.py#L254].
{code:java}
hostname = config['agentLevelParams']['hostname']
{code}
My guess is that there is no {{hostname}} property defined in the relevant
context. However, I do see it in
[https://github.com/hortonworks/hdp_ambari_definitions/blob/AMBARI-2.7-maint/src/main/resources/stacks/HDP/3.0/services/HDFS/package/scripts/params_linux.py#L187.]
So I am not quite sure what is going on.
Maybe this wacky substitution does not work in the alerts mechanism or maybe
params_linux.py is not being executed.
> Ambari is unable to parse {{hostname}} in {hdfs-site/dfs.datanode.address}
> and is triggering alert for datanode process
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: AMBARI-24961
> URL: https://issues.apache.org/jira/browse/AMBARI-24961
> Project: Ambari
> Issue Type: Bug
> Components: ambari-agent
> Affects Versions: trunk, 2.6.2, 2.7.0
> Environment: ambari-2.6.2
> ambari-2.7.0
> trunk
> Reporter: Akhil S Naik
> Assignee: Akhil S Naik
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Ambari is unable to parse \\{\{hostname\}\} in
> {hdfs-site/dfs.datanode.address} and is triggering alert for datanode process
> I changed the value of dfs.datanode.address in Advanced hdfs configuration
> using ambari
> i set value to \\{\{hostname\}\}:50010 ( default value is 0.0.0.0:50010 )
> Now after restart datanode is working fine and but ambari is triggering alert
> on datanode process with error :
> "Connection failed: [Errno -2] Name or service not known to
> \\{\{hostname\}\}:50010"
> expected result : Ambari shouldnt trigger the alert and it should pass
> \\{\{hostname\}\} correctly to localhost
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