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https://issues.apache.org/jira/browse/AMBARI-3714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816074#comment-13816074
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Aleksandr Kovalenko commented on AMBARI-3714:
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+1 for the patch
> [perf] UI should only request data from master host-components
> --------------------------------------------------------------
>
> Key: AMBARI-3714
> URL: https://issues.apache.org/jira/browse/AMBARI-3714
> 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-3714.patch
>
>
> When Ambari UI loads, we get services installed. To get information about the
> services, we ask for *all* host_components (master, worker, client, etc.)
> {code}
> http://server:8080/api/v1/clusters/ga/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time,components/host_components/metrics/dfs/FSNamesystem/HAState,components/host_components/metrics/dfs/FSNamesystem/CapacityUsed,components/host_components/metrics/dfs/FSNamesystem/CapacityTotal,components/host_components/metrics/dfs/FSNamesystem/CapacityRemaining,components/host_components/metrics/dfs/FSNamesystem/BlocksTotal,components/host_components/metrics/dfs/FSNamesystem/CorruptBlocks,components/host_components/metrics/dfs/FSNamesystem/MissingBlocks,components/host_components/metrics/dfs/FSNamesystem/UnderReplicatedBlocks,components/host_components/metrics/dfs/namenode/Version,components/host_components/metrics/dfs/namenode/LiveNodes,components/host_components/metrics/dfs/namenode/DeadNodes,components/host_components/metrics/dfs/namenode/DecomNodes,components/host_components/metrics/dfs/namenode/TotalFiles,components/host_components/metrics/dfs/namenode/UpgradeFinalized,components/host_components/metrics/dfs/namenode/Safemode,components/host_components/metrics/runtime/StartTime,components/host_components/metrics/flume/flume,components/host_components/metrics/yarn/Queue
> {code}
> However for services, only the master host-components are necessary.
> UI should only get master host-components when loading Ambari. This means
> multiple things in API.
> * Service status {{ServiceInfo/state}} should be accurate based on the master
> host-component status
> * Host-components should have a property indicating what type of
> host-component they are (master/worker/client/etc.).
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