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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4074) [timeline reader] implement support for querying for flows and flow runs
Date Mon, 31 Aug 2015 17:56:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14723773#comment-14723773
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Sangjin Lee commented on YARN-4074:
-----------------------------------

Just to clarify on the flow run "end time". Note that there is no formal definition of the
"end time" of a flow run, in the absence of a formal flow API in YARN. The "end time" in the
flow run is the latest end time of an application that is part of that flow run. Just so that
we're clear on that definition.

On a related note, there is no formal definition of the state of a flow run (i.e. we cannot
say with certainty whether a flow run is ended). The only definitive thing we can say about
this is if a flow run is still running, which can be determined by having a running app.

> [timeline reader] implement support for querying for flows and flow runs
> ------------------------------------------------------------------------
>
>                 Key: YARN-4074
>                 URL: https://issues.apache.org/jira/browse/YARN-4074
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>         Attachments: YARN-4074-YARN-2928.POC.001.patch, YARN-4074-YARN-2928.POC.002.patch
>
>
> Implement support for querying for flows and flow runs.
> We should be able to query for the most recent N flows, etc.
> This includes changes to the {{TimelineReader}} API if necessary, as well as implementation
of the API.



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