[jira] [Created] (AMBARI-8163) Provide stage resource information via REST API

["Robert Levas (JIRA)" <ji...@apache.org>]

Robert Levas created AMBARI-8163:
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             Summary: Provide stage resource information via REST API
                 Key: AMBARI-8163
                 URL: https://issues.apache.org/jira/browse/AMBARI-8163
             Project: Ambari
          Issue Type: New Feature
          Components: ambari-server
    Affects Versions: 2.0.0
            Reporter: Robert Levas
             Fix For: 2.0.0


Currently, it is possible to query Ambari (via the REST API) for details about _asynchronous_ requests and their related tasks. This useful when trying to obtain progress information.  However, some information that may be useful is not available.  This information is related to the stages that are generated. 

*NOTE:* Each _asynchronous_ request is broken down into 1 or more stages and each stage contains 1 or more tasks.

If stage information was available via the REST API, it would be possible for the caller (maybe a UI) to track high-level tasks (at the {{stage}} level) rather than each lower-level unit of work (at the {{task}} level).   

To allow for this, a new API resource (and associated handler) needs to be created.  The resource should be read-only (like {{requests}} and {{tasks}}), and should provide information stored in the {{stage}} table from the Ambari database.  

The following properties should be returned for each {{stage}}:

* stage_id
* request_id
* cluster_id
* request_context 
** _This should probably be renamed to something more appropriate, like stage_context, stage_name, or etc..._
* start_time
* end_time
* progress_percent
* status

It is expected that the resources would be queried using:

{code}
GET  /api/v1/clusters/{clusterid}/requests/{requestid}/stages
{code}

Also, some subset of the stage data should be provided when querying for details about a specific {{request}}, like in:

{code}
GET  /api/v1/clusters/{clusterid}/requests/{requestid}
{code}

See {{request}} and {{task}} resource for examples.






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