[jira] [Updated] (YARN-5510) Optimize Resource implementation for instantiation

["He Tianyi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-5510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

He Tianyi updated YARN-5510:
----------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: YARN-5479

> Optimize Resource implementation for instantiation
> --------------------------------------------------
>
>                 Key: YARN-5510
>                 URL: https://issues.apache.org/jira/browse/YARN-5510
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: He Tianyi
>
> According to YARN-5479, many {{Resource}} instances are created as intermediate result of calculating in scheduler (as a result of {{Resources.subtract}} and {{Resources.add}}). This introduces pressure on garbage collector as well as CPU cycles for scheduling.
> Therefore, the issue proposes a lightweight implementation of {{Resource}}, which optimized for scheduler usage. That is, making instantiation of {{Resource}} cheaper.
> In discussion of {{YARN-5479}}, we thought maybe sticking to one version of implementation avoids unnecessary complexity.
> In current implementation {{ResourceImplPB}}, a builder is also created during construction. Also, {{maybeInitBuilder}} get called during each {{setMemory}} or {{setVirtualCores}}. The {{builder}} get prepared regardless whether {{Resource}} will be exchanged via IPC or not. 
> However, in scheduler (which performance is critical), most of these instances are just intermediate result and not exposed.
> Suppose we could move builder related code into {{getProto}}.



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