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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (YARN-8275) Create a JNI interface to interact with Windows
Date Fri, 11 May 2018 01:00:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16471346#comment-16471346
] 

Íñigo Goiri commented on YARN-8275:
-----------------------------------

We've been seeing heavy load on winutils too.
AFAIK, the main contributor for this was [~cnauroth] but I don't think this is being maintained
much nowadays.
Others involved were [~kiranmr] and [~rusanu].

In any case, as long as we make it pluggable and allow switching between winutils.exe and
JNI this is doable.


> Create a JNI interface to interact with Windows
> -----------------------------------------------
>
>                 Key: YARN-8275
>                 URL: https://issues.apache.org/jira/browse/YARN-8275
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: nodemanager
>            Reporter: Giovanni Matteo Fumarola
>            Assignee: Giovanni Matteo Fumarola
>            Priority: Minor
>         Attachments: WinUtils.CSV
>
>
> I did a quick investigation of the performance of WinUtils in YARN. In average NM calls
4.76 times per second and 65.51 per container.
>  
> | |Requests|Requests/sec|Requests/min|Requests/container|
> |*Sum [WinUtils]*|*135354*|*4.761*|*286.160*|*65.51*|
> |[WinUtils] Execute -help|4148|0.145|8.769|2.007|
> |[WinUtils] Execute -ls|2842|0.0999|6.008|1.37|
> |[WinUtils] Execute -systeminfo|9153|0.321|19.35|4.43|
> |[WinUtils] Execute -symlink|115096|4.048|243.33|57.37|
> |[WinUtils] Execute -task isAlive|4115|0.144|8.699|2.05|
>  Interval: 7 hours, 53 minutes and 48 seconds
> Each execution of WinUtils does around *140 IO ops*, of which 130 are DDL ops.
> This means *666.58* IO ops/second due to WinUtils.
> We should start considering to remove WinUtils from Hadoop and creating a JNI interface.



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