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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6245) Add FinalResource object to reduce overhead of Resource class instancing
Date Mon, 03 Apr 2017 17:34:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953885#comment-15953885
] 

Wangda Tan commented on YARN-6245:
----------------------------------

[~roniburd],

All your suggestions make sense to me. In addition to that, If the new {{LightResource}} is
targeted to solve the *internal* computation overhead, I think we can safely assume it will
be used in a single-thread environment and no addition locks needed. Which can reduce even
more overhead and delays.

+[~sunilg]/[~vvasudev], they are looking at similar issues now while doing perf tests of YARN-3926.


Thoughts?

> Add FinalResource object to reduce overhead of Resource class instancing
> ------------------------------------------------------------------------
>
>                 Key: YARN-6245
>                 URL: https://issues.apache.org/jira/browse/YARN-6245
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>         Attachments: observable-resource.patch, YARN-6245.preliminary-staled.1.patch
>
>
> There're lots of Resource object creation in YARN Scheduler, since Resource object is
backed by protobuf, creation of such objects is expensive and becomes bottleneck.
> To address the problem, we can introduce a FinalResource (Is it better to call it ImmutableResource?)
object, which is not backed by PBImpl. We can use this object in frequent invoke paths in
the scheduler.



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