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https://issues.apache.org/jira/browse/AMBARI-22945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Swapan Shridhar resolved AMBARI-22945.
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Resolution: Fixed
> Enhance host components API to support multiple host component instances.
> -------------------------------------------------------------------------
>
> Key: AMBARI-22945
> URL: https://issues.apache.org/jira/browse/AMBARI-22945
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Reporter: Swapan Shridhar
> Assignee: Swapan Shridhar
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.0.0
>
> Attachments: Ambari API v2.postman_collection_Updated
>
> Time Spent: 7h 50m
> Remaining Estimate: 0h
>
> *BACKGROUND:*
> Given that in Ambari, we refer components of a services in 2 ways:
> - *1.* One from the Service component APIs :
>
> *http://<AmbariServerHost>:8080/api/v1/clusters/<clusterName>/services/<ServiceName>/components/<componentName>*
> - *2.*From the host component APIs (which tell us the host on which the
> current component is resides)
>
> *http://<AmbariServerHost>:8080/api/v1/clusters/<clusterName>/hosts/<hostName>/host_components/<hostComponentName>*
> _Note that, we of now, we are referring both 1and 2 using the component names_
> But in the multi-component world for Ambari, we will come up with a situation
> like this, as shown below:
> - *A.* If *core* _Service Group_ has its *HDFS_CLIENT* type component named
> as *HDFS_CLIENT*
> *Core -> HDFS -> HDFS_CLIENT*
> - *B.* And at the same time, we have *edw* _Service Group_ having its
> *HDFS_CLIENT* type component named as *HDFS_CLIENT* :
> *edw -> HDFS -> HDFS_CLIENT*
> There is no good way to distinguish a given host component in *A* and *B*,
> if we continue to refer them with the component name end point (No. *2* API
> call).
> However, No. *1* call is still fine as we will not allow 2 names for the same
> component within a given service, thus making it unique and allowing us to
> continue using the component names endpoint.
> *****************************************************************WORK DONE
> :*******************************************************************
> In order to support multi-instance for components of a given service, we need
> to enhance the *Host Components API* so that they can distinguish *one
> component instance of a service* from *another component instance of a
> service* with the same Name.
> The way to achieve this is to move Host Components API to be *ID* (number)
> based end point, compared to earlier being a name based endpoint. This will
> allow us to distinguish *Core -> HDFS -> HDFS_CLIENT* from *edw -> HDFS ->
> HDFS_CLIENT*, as an example.
> Thus, following changes are required:
> - New field : *component_type* (eg: HDFS_CLIENT, HIVE_SERVER,
> ZOOKEEPER_SERVER etc)
> - Existing field : *component_name* will now hold the actual name given for
> the component at the time of install. For example:
> - *HDFS_CLIENT_EDW* for component_type *HDFS_CLIENT*
> - *HIVE_SERVER* FOR component_type *HIVE_SERVER* _(name can be same as
> type also)_
> - *HIVE_SERVER1* for component_type *HIVE_SERVER*
> - *ZOOKEEPER_SERVER_FOR_KAFKA* for component_type *ZOOKEEPER_SERVER*,
> and so forth.
>
> - A way to identify the HOST component uniquely via API calls, by way of
> referring them by *ID* instead of name.
> *MODIFIED API CALLs:*
> 1. POST SERVICE COMPONENT API call
>
> - CHANGE : New field *component_type*
> - POST
> http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/servicegroups/core/services/HDFS/components
> Body :
> {code}
>
> [{"ServiceComponentInfo":{"component_name":"HDFS_CLIENT2","component_type":"HDFS_CLIENT"}}]
> {code}
> Response:
>
> {code}
> {
> "resources" : [
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/servicegroups/core/services/HDFS/components/HDFS_CLIENT2",
> "ServiceComponentInfo" : {
> "category" : null,
> "cluster_id" : 2,
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "component_type" : "HDFS_CLIENT",
> "desired_stack" : "HDP-2.6",
> "desired_version" : "NOT_REQUIRED",
> "display_name" : "HDFS Client",
> "id" : 51,
> "recovery_enabled" : false,
> "service_group_id" : 2,
> "service_group_name" : "core",
> "service_id" : 3,
> "service_name" : "HDFS",
> "service_type" : "HDFS",
> "state" : "STARTED",
> "total_count" : {
> "installFailedCount" : 0,
> "unknownCount" : 0,
> "installedCount" : 0,
> "initCount" : 0,
> "installedAndMaintenanceOffCount" : 0,
> "startedCount" : 0,
> "totalCount" : 0
> }
> }
> }
> ]
> }
> {code}
>
> 2. POST HOST COMPONENT API call
> - CHANGE : New field *component_type*
> - POST
> http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>/host_components
> Body
> {code}
> {"HostRoles":{"cluster_name":
> "c1","component_name":"HDFS_CLIENT2","component_type":"HDFS_CLIENT"}}
> {code}
> - Response:
> {code}
> {
> "resources" : [
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>/host_components/51",
> "HostRoles" : {
> "actual_configs" : { },
> "cluster_id" : 2,
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "component_type" : "HDFS_CLIENT",
> "desired_admin_state" : null,
> "desired_repository_version" : "2.6.4.0-91",
> "desired_stack_id" : "HDP-2.6",
> "display_name" : "HDFS_CLIENT2",
> "host_name" : "<host1>",
> "id" : 51,
> "maintenance_state" : null,
> "public_host_name" : "<host1>",
> "service_group_id" : 2,
> "service_group_name" : "core",
> "service_id" : 3,
> "service_name" : "HDFS",
> "service_type" : "HDFS",
> "stale_configs" : false,
> "state" : "INIT",
> "upgrade_state" : "NONE",
> "version" : "UNKNOWN"
> },
> "host" : {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>"
> }
> }
> ]
> }
> {code}
> 3. GET SERVICE COMPONENT:
> - CHANGE: *host_components* sub-resource will be referenced with end point
> as ID one.
> - GET
> http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/servicegroups/core/services/HDFS/components/HDFS_CLIENT2
> - Response:
> {code}
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/servicegroups/core/services/HDFS/components/HDFS_CLIENT2",
> "ServiceComponentInfo" : {
> "category" : null,
> "cluster_id" : 2,
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "component_type" : "HDFS_CLIENT",
> "desired_stack" : "HDP-2.6",
> "desired_version" : "2.6.4.0-91",
> "display_name" : "HDFS Client",
> "id" : 51,
> "init_count" : 1,
> "install_failed_count" : 0,
> "installed_and_maintenance_off_count" : 0,
> "installed_count" : 0,
> "recovery_enabled" : "false",
> "repository_state" : "NOT_REQUIRED",
> "service_group_id" : 2,
> "service_group_name" : "core",
> "service_id" : 3,
> "service_name" : "HDFS",
> "service_type" : "HDFS",
> "started_count" : 0,
> "state" : "STARTED",
> "total_count" : 1,
> "unknown_count" : 0
> },
> "host_components" : [
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>/host_components/51",
> "HostRoles" : {
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "host_name" : "<host1>",
> "id" : 51,
> "service_group_name" : "core",
> "service_name" : "HDFS"
> }
> }
> ]
> }
> {code}
> 4. GET HOST COMPONENT:
> - CHANGE: Called with ID based end point
> - GET
> http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>/host_components/51
> - Response:
> {code}
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>/host_components/51",
> "HostRoles" : {
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "component_type" : "HDFS_CLIENT",
> "desired_repository_version" : "2.6.4.0-91",
> "desired_stack_id" : "HDP-2.6",
> "desired_state" : "INIT",
> "display_name" : "HDFS_CLIENT2",
> "host_name" : "<host1>",
> "id" : 51,
> "maintenance_state" : "OFF",
> "public_host_name" : "<host1>",
> "reload_configs" : false,
> "service_group_name" : "core",
> "service_name" : "HDFS",
> "stale_configs" : false,
> "state" : "INIT",
> "upgrade_state" : "NONE",
> "version" : "UNKNOWN",
> "actual_configs" : { }
> },
> "host" : {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/hosts/<host1>"
> },
> "processes" : [ ],
> "component" : [
> {
> "href" :
> "http://{{AmbariServer}}:8080/api/v1/clusters/<clusterName>/servicegroups/core/services/HDFS/components/HDFS_CLIENT2",
> "ServiceComponentInfo" : {
> "cluster_name" : "c1",
> "component_name" : "HDFS_CLIENT2",
> "service_group_name" : "core",
> "service_name" : "HDFS"
> }
> }
> ]
> }
> {code}
> 5. UPDATE SERVICE COMPONENTS
> - NO CHANGE
> 6. UPDATE HOST COMPONENTS
> - CHANGE: API end point is ID based now.
> 7. DELETE SERVICE COMPONENT:
> - No CHANGE
> 8. DELETE HOST COMPONENT:
> - CHANGE: API end point is ID based now.
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