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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5585) [Atsv2] Add a new filter fromId in REST endpoints
Date Fri, 23 Sep 2016 20:29:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15517489#comment-15517489
] 

Sangjin Lee commented on YARN-5585:
-----------------------------------

I do have one question for us to think about. With the entity id prefix, it becomes a requirement
that the framework provide the entity id prefix on all writes, including *updates* to existing
entities. This might become an interesting challenge.

For example, if tez wanted to use the created time of a vertex as its entity id prefix (for
sorting), then even for subsequent updates of a vertex entity, tez would need to pass the
created time, or it would be difficult to write.

[~vrushalic], [~jrottinghuis], thoughts?

[~rohithsharma], is it feasible for tez to provide created time every time a tez entity is
created or *updated*?

> [Atsv2] Add a new filter fromId in REST endpoints
> -------------------------------------------------
>
>                 Key: YARN-5585
>                 URL: https://issues.apache.org/jira/browse/YARN-5585
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelinereader
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>            Priority: Critical
>         Attachments: YARN-5585.v0.patch
>
>
> TimelineReader REST API's provides lot of filters to retrieve the applications. Along
with those, it would be good to add new filter i.e fromId so that entities can be retrieved
after the fromId. 
> Current Behavior : Default limit is set to 100. If there are 1000 entities then REST
call gives first/last 100 entities. How to retrieve next set of 100 entities i.e 101 to 200
OR 900 to 801?
> Example : If applications are stored database, app-1 app-2 ... app-10.
> *getApps?limit=5* gives app-1 to app-5. But to retrieve next 5 apps, there is no way
to achieve this. 
> So proposal is to have fromId in the filter like *getApps?limit=5&&fromId=app-5*
which gives list of apps from app-6 to app-10. 
> Since ATS is targeting large number of entities storage, it is very common use case to
get next set of entities using fromId rather than querying all the entites. This is very useful
for pagination in web UI.



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