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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2990) FairScheduler's delay-scheduling always waits for node-local and rack-local delays, even for off-rack-only requests
Date Thu, 15 Jan 2015 06:07:34 GMT

    [ https://issues.apache.org/jira/browse/YARN-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278300#comment-14278300
] 

Karthik Kambatla commented on YARN-2990:
----------------------------------------

Looked more closely, unfortunately this appears to be by design. Each application has an "allowed
locality level" - initially node-local, and transitions to rack-local and off-switch after
the corresponding delays. Instead, it might be better to track this allowed locality level
per {{ResourceRequest}}. I propose:
# In the short-term, to address the case where the AM has to go through the node-local and
rack-local delays, we could start with the default locality level of off-switch and reset
it node-local after the AM is allocated. 
# In the long-term, let us augment ResourceRequest to include allowed locality level. 

Thoughts? 

> FairScheduler's delay-scheduling always waits for node-local and rack-local delays, even
for off-rack-only requests
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2990
>                 URL: https://issues.apache.org/jira/browse/YARN-2990
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: yarn-2990-test.patch
>
>
> Looking at the FairScheduler, it appears the node/rack locality delays are used for all
requests, even those that are only off-rack. 
> More details in comments. 



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