[jira] [Reopened] (AMBARI-14690) Configurable system resource values for ambari-agent

["Sebastian Toader (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMBARI-14690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Toader reopened AMBARI-14690:
---------------------------------------

> Configurable system resource values for ambari-agent
> ----------------------------------------------------
>
>                 Key: AMBARI-14690
>                 URL: https://issues.apache.org/jira/browse/AMBARI-14690
>             Project: Ambari
>          Issue Type: Improvement
>          Components: ambari-agent
>    Affects Versions: 2.2.0
>            Reporter: Olivér Szabó
>            Assignee: Olivér Szabó
>             Fix For: 2.2.2
>
>         Attachments: AMBARI-14690_v7.patch
>
>
> When an ambari agent starts, host system details are registered into ambari server database. These values are calculated by ambari-agents based on different files on the hosts (e.g : /proc/meminfo). 
> In some cases it isn't a correct behavior: If ambari-agent is in a docker-container, it will see the same memory/cpu details. (stack advisor also uses these values, its possible stack advisor can recommend a too high memory value for some services)
> Solution: Configurable system resources for hosts (ambari-agent).
> Added new option to 'agent' section in ambari-agent.ini: system_resource_overrides. It points to a directory, if the value/directory does not exist or empty, it will use the default behavior
> {code:java}
> [agent]
> ...
> system_resource_overrides=/etc/resource_overrides
> ...
> {code}
> It reads all json files from that directory. JSON structure looks like this:
> {code:java}
> {
> "memoryfree" :  "15600",
> "memorytotal" : ....
> }
> {code}
> In ambari-agent Facter.py set these values, all of the factor info values can be redefined in one or multiple JSON files.
> That means ambari is not responsible to gather these values from the system.
> - use case: 
> During 'docker run' , before 'ambari-agent start', 'system_resource_overrides' value can be overwritten, or the default ('/etc/resource_overrides') can be mount with '-v' flag (docker run -v /my/path:/etc/resource_overrides).
> Facter.py is called during ambari-agent start, so if the values will be modified later, ambari-agent needs to be restarted.



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