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Date: Mon, 4 Dec 2017 11:04:00 +0000 (UTC)
From: "Tao Yang (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13094312.1502612014000.377303.1512385440252@Atlassian.JIRA>
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References: <JIRA.13094312.1502612014000@Atlassian.JIRA> <JIRA.13094312.1502612014060@jira-lw-us.apache.org>
Subject: [jira] [Commented] (YARN-7005) Skip unnecessary sorting and
 iterating process for child queues without pending resource to optimize
 schedule performance
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archived-at: Mon, 04 Dec 2017 11:04:08 -0000


    [ https://issues.apache.org/jira/browse/YARN-7005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276622#comment-16276622 ] 

Tao Yang commented on YARN-7005:
--------------------------------

Thanks [~leftnoteasy] for your suggestions. Yes, it's enough and more efficient to check pending resource by partition here.
Can you give some suggestions for the benchmark?  Is it better to use SLS?

> Skip unnecessary sorting and iterating process for child queues without pending resource to optimize schedule performance
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7005
>                 URL: https://issues.apache.org/jira/browse/YARN-7005
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.9.0, 3.0.0-alpha4
>            Reporter: Tao Yang
>         Attachments: YARN-7005.001.patch
>
>
> Nowadays even if there is only one pending app in a queue, the scheduling process will go through all queues anyway and costs most of time on sorting and iterating child queues in ParentQueue#assignContainersToChildQueues. 
> IIUIC, queues that have no pending resource can be skipped for sorting and iterating process to reduce time cost, obviously for a cluster with many queues. Please feel free to correct me if I ignore something else. Thanks.


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