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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7037) Optimize data transfer with zero-copy approach for containerlogs REST API in NMWebServices
Date Wed, 23 Aug 2017 21:10:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16139117#comment-16139117
] 

Junping Du commented on YARN-7037:
----------------------------------

Thanks [~Tao Yang] for delivering the patch. The approach (bypass unnecessary buffer) here
make sense to me. 
For trunk branch patch, instead of adding a new method - {{outputContainerLogThroughZeroCopy}},
may be we should replace original method - {{outputContainerLog}} directly? So that other
callers like outputAggregatedContainerLog() can benefit from the performance improvement here.

> Optimize data transfer with zero-copy approach for containerlogs REST API in NMWebServices
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-7037
>                 URL: https://issues.apache.org/jira/browse/YARN-7037
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.8.0
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>         Attachments: YARN-7037.001.patch, YARN-7037.branch-2.8.001.patch
>
>
> Split this improvement from YARN-6259.
> It's useful to read container logs more efficiently. With zero-copy approach, data transfer
pipeline (disk --> read buffer --> NM buffer --> socket buffer) can be optimized
to pipeline(disk --> read buffer --> socket buffer) .
> In my local test, time cost of copying 256MB file with zero-copy can be reduced from
12 seconds to 2.5 seconds.



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