[jira] [Commented] (YARN-5571) [Atsv2] Query App REST endpoing need not to expose queryParams such userId/flowname/flowrunid

["Varun Saxena (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15443006#comment-15443006 ] 

Varun Saxena commented on YARN-5571:
------------------------------------

These query params preclude the need to query AppToFlowTable which means one less operation and hence a potentially faster query.
We currently do not maintain any state in reader i.e. App to flow mapping is not maintained so app to flow information is not available in cache.

> [Atsv2] Query App REST endpoing need not to expose queryParams such userId/flowname/flowrunid
> ---------------------------------------------------------------------------------------------
>
>                 Key: YARN-5571
>                 URL: https://issues.apache.org/jira/browse/YARN-5571
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: timelinereader
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>
> Timeline reader provides REST end point for querying app with an URL {{GET /ws/v2/timeline/apps/\{app id\}}} along with queryParam as an filter. But queryParam such as {{userId/flowname/flowrunid}} not at useful for querying an app with app-id. In YARN cluster, only one app-id will be exist though out life time. So userId/flowname/flowrunid not at all useful for the app-id REST empoint
> {noformat}
>   @GET
>   @Path("/apps/{appid}/")
>   @Produces(MediaType.APPLICATION_JSON)
>   public TimelineEntity getApp(
>       @Context HttpServletRequest req,
>       @Context HttpServletResponse res,
>       @PathParam("appid") String appId,
>       @QueryParam("flowname") String flowName,
>       @QueryParam("flowrunid") String flowRunId,
>       @QueryParam("userid") String userId,
>       @QueryParam("confstoretrieve") String confsToRetrieve,
>       @QueryParam("metricstoretrieve") String metricsToRetrieve,
>       @QueryParam("fields") String fields,
>       @QueryParam("metricslimit") String metricsLimit) {
>     return getApp(req, res, null, appId, flowName, flowRunId, userId,
>         confsToRetrieve, metricsToRetrieve, fields, metricsLimit);
>   }
> {noformat} 



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