[jira] [Commented] (AMBARI-3693) [perf] Hosts UI should not load host_components unless editing a host

["Aleksandr Kovalenko (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13813909#comment-13813909 ] 

Aleksandr Kovalenko commented on AMBARI-3693:
---------------------------------------------

+1 for the patch

> [perf] Hosts UI should not load host_components unless editing a host
> ---------------------------------------------------------------------
>
>                 Key: AMBARI-3693
>                 URL: https://issues.apache.org/jira/browse/AMBARI-3693
>             Project: Ambari
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 1.4.1
>            Reporter: Andrii Tkach
>            Assignee: Andrii Tkach
>             Fix For: 1.4.2
>
>         Attachments: AMBARI-3693.patch
>
>
> Ambari UI when getting hosts, also gets all the host-components. This is needed to calculate state of each host, when filtering by components on Hosts page, and when editing a host.
> The call UI makes is
> {code}
> http://server:8080/api/v1/clusters/ga/hosts?fields=Hosts/host_name,Hosts/public_host_name,Hosts/disk_info,Hosts/cpu_count,Hosts/total_mem,Hosts/host_status,Hosts/last_heartbeat_time,Hosts/os_arch,Hosts/os_type,Hosts/ip,host_components,metrics/disk,metrics/load/load_one
> {code}
> UI should get away from loading all host-components where possible.
> * Ambari load
> ** UI should not ask for all host-components
> ** Hosts should have their {{state}} flag reflect rolled-up status of host-components
> * Hosts page
> ** UI has no option but to load basic information on all host_components. But only when you enter this page.
> * Individual host editing
> ** Load host_components for that host (if not loaded)
> UI might need a wrapper/utility class where we do not directly ask Ember for host_components, but rather maintain a cache and load only when necessary. This will allow the flexibility required for above varying cases.
> Also API needs to provide the rolled up {{state}} flag.



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