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From "Nate Cole (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-3600) Add stale_configs attribute to a host_component response
Date Tue, 29 Oct 2013 13:10:30 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-3600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13807958#comment-13807958
] 

Nate Cole commented on AMBARI-3600:
-----------------------------------

* ConfigHelper
** Will update comment to be more clear
** hasPropertyFor() - This is required because we need to check to see if a property is stale
for ANY OTHER service than the SCH that we are checking, because the OTHER one will be considered
stale.  That check is designed to look forcustom properties that are assigned to a type but
are not defined as part of the stack.  For example, if you assign a value to core-site that
is undefined in any stack, any service relying on core-site will be considered stale.
** findChangedKeys() - it's ok for overlap in this case, because even overlapping (two properties
defined in two different services) means it's stale.
** The method is (more or less) directly tested in ServiceComponentHostTest.testStaleConfigs()
as you mentioned.
* StackServiceResponse
** TT/JT - the stack service response only indicates what configs a service defines, not the
relationship of components to the config.  Any stale config value will make both TT and JT
stale.
* ServiceInfo
** Will add synchronization to the method, but note that ServiceInfo is effectively singleton-per-stack,
and no other synch activity happens around stacks as it is today.
* testStaleConfigs() addresses the SCHTest you mentioned.  Will switch to 2.0.6 and verify.

> Add stale_configs attribute to a host_component response
> --------------------------------------------------------
>
>                 Key: AMBARI-3600
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3600
>             Project: Ambari
>          Issue Type: Task
>            Reporter: Nate Cole
>            Assignee: Nate Cole
>             Fix For: 1.4.2
>
>         Attachments: AMBARI-3600.patch
>
>
> Add an intelligent check to determine if the configs are stale on a host_component. 
The response will have like the following:
> {noformat}
> {
>   "href" : "http://localhost:8080/api/v1/clusters/c1/hosts/h1/host_components/DATANODE?fields=HostRoles/stale_configs",
>   "HostRoles" : {
>     "cluster_name" : "c1",
>     "component_name" : "DATANODE",
>     "host_name" : "h1",
>     "stale_configs" : true
>   }
> }
> {noformat}



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