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From "Tom Beerbower (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (AMBARI-2254) Reduce number of requests when querying for subtasks
Date Tue, 04 Jun 2013 16:37:20 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom Beerbower reopened AMBARI-2254:
-----------------------------------


Patch caused regression.  Reopening to fix and add more unit tests.
                
> Reduce number of requests when querying for subtasks
> ----------------------------------------------------
>
>                 Key: AMBARI-2254
>                 URL: https://issues.apache.org/jira/browse/AMBARI-2254
>             Project: Ambari
>          Issue Type: Bug
>            Reporter: Tom Beerbower
>            Assignee: Tom Beerbower
>         Attachments: AMBARI-2254.patch
>
>
> A query like ...
> /services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles
> ... will create multiple requests for resources through the ClusterController. It looks
like ClusterController gets called once for all the services, then once for all of the components
under each service, then once for all the host_components under each component under each
service. So, if there are 10 services that each have 10 components, there will be 100 calls
to the ClusterController to get host components, plus 10 calls for the components and another
for the services. We should be able to optimize this down to 3 calls... 1 for the services,
1 for the components and 1 for the host_components.

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