Olivér Szabó created AMBARI-14690:
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Summary: 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: 2.4.0
Reporter: Olivér Szabó
Assignee: Olivér Szabó
Fix For: 2.4.0
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 in ambari-agent.ini
{code:java}
[system_resource]
processorcount=2
physicalprocessorcount=2
memorysize=50000
memoryfree=50000
memorytotal=100000
swapsize=20
swapfree=20
...
{code}
In ambari-agent Facter.py set these values, all of the factor info values can
be redefined in ambari-agent.ini file.
That means ambari is not responsible to gather these values from the system.
- use case:
During 'docker start' , if there is a script which calls 'ambari-agent start',
before that, some of the memory values can be replaced/inserted into the
ambari-agent.ini file in that script. (e.g. the user knows that, 4 ambari-agent
containers will be started, with the same services, so the real memory needs to
be devided by 4 etc.)
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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