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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3862) Support for fetching specific configs and metrics based on prefixes
Date Wed, 02 Dec 2015 05:03:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035275#comment-15035275

Varun Saxena commented on YARN-3862:

[~sjlee0], kindly review. Regarding some of the checkstyle comments. 

If below two checkstyle issues have to be fixed, I think they should be fixed for around 10
other variables as well. We are directly accessing these variables in subclasses(***EntityReader).
Do you want me to add getters and setters for each one of them ?
Variable 'confsToRetrieve' must be private and have accessor methods.
Variable 'metricsToRetrieve' must be private and have accessor methods.

Below checkstyle issue is introduced because of javadoc. This import is required in javadoc
as I have a link to this class in javadoc. If I give full classname along with package name,
it threw multiple javadoc warnings in previous build. So I guess this should be fine.
Unused import - org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelinePrefixFilter.

> Support for fetching specific configs and metrics based on prefixes
> -------------------------------------------------------------------
>                 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
>              Labels: yarn-2928-1st-milestone
>         Attachments: YARN-3862-YARN-2928.wip.01.patch, YARN-3862-YARN-2928.wip.02.patch,
YARN-3862-feature-YARN-2928.005.patch, YARN-3862-feature-YARN-2928.04.patch, YARN-3862-feature-YARN-2928.wip.03.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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