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From "Joep Rottinghuis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5585) [Atsv2] Add a new filter fromId in REST endpoints
Date Sun, 25 Sep 2016 15:04:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15520952#comment-15520952
] 

Joep Rottinghuis commented on YARN-5585:
----------------------------------------

[~sjlee0] wouldn't the column value filter on entity-id uniquely identify the row to update?

I think the additional challenge is that our setup allows for an easy rowkey - column name
retrieval, but adding  column value filter will mean we'll have to add that to the provided
filters on the fly. Users can already provide filters.
In this case we'll have to create an _and_ filter with the column value filter for entity
ID for us and the user-provided on the other side. I think the plumbing already allows for
a FilterList, so we'll have to add this one, preferably in the beginning of the list (no need
to evaluate all other possibly complex filters when the entity ID doesn't match).

> [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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