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https://issues.apache.org/jira/browse/YARN-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15443052#comment-15443052
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Varun Saxena commented on YARN-5571:
------------------------------------
Just to elaborate further, we allow entities to be written from multiple
clusters which can lead to a clash of Application IDs' (however unlikely as
cluster timestamp is also used in App id).
This means that there can be potentially same AppID from 2 different clusters
belonging to 2 different flows coming to us.
These query params if specified, will then help us to skip querying app to flow
table.
> [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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