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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3862) Decide which contents to retrieve and send back in response in TimelineReader
Date Fri, 21 Aug 2015 17:25:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707073#comment-14707073
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Sangjin Lee commented on YARN-3862:
-----------------------------------

I understand that the distiction between what selects rows and what selects columns in HBase
is not as strong. I think it has more to do with the mental model of whoever is using the
API than anything.

If this API is not exposed to the client, then this distinction is probably bit less important
because the consumer is basically us. But even for us, I think it would be good to have some
separation so we can reason about this without much confusion.

> Decide which contents to retrieve and send back in response in TimelineReader
> -----------------------------------------------------------------------------
>
>                 Key: YARN-3862
>                 URL: https://issues.apache.org/jira/browse/YARN-3862
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>         Attachments: YARN-3862-YARN-2928.wip.01.patch
>
>
> Currently, we will retrieve all the contents of the field if that field is specified
in the query API. In case of configs and metrics, this can become a lot of data even though
the user doesn't need it. So we need to provide a way to query only a set of configs or metrics.
> As a comma spearated list of configs/metrics to be returned will be quite cumbersome
to specify, we have to support either of the following options :
> # Prefix match
> # Regex
> # Group the configs/metrics and query that group.
> We also need a facility to specify a metric time window to return metrics in a that window.
This may be useful in plotting graphs 



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