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From "Giovanni Matteo Fumarola (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15461) Improvements over the Hadoop support with Windows
Date Tue, 05 Jun 2018 23:04:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Giovanni Matteo Fumarola updated HADOOP-15461:
----------------------------------------------
    Attachment: WinUtils-Functions.pdf
                WinUtils.CSV

> Improvements over the Hadoop support with Windows
> -------------------------------------------------
>
>                 Key: HADOOP-15461
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15461
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Giovanni Matteo Fumarola
>            Assignee: Giovanni Matteo Fumarola
>            Priority: Major
>         Attachments: WinUtils-Functions.pdf, WinUtils.CSV
>
>
> This Jira tracks the effort to improve the interaction between Hadoop and Windows Server.
>  * Move away from an external process (winutils.exe) for native code:
>  ** Replace by native Java APIs (e.g., symlinks);
>  ** Replace by something like JNI or so;
>  * Fix the build system to fully leverage cmake instead of msbuild;
>  * Possible other improvements;
>  * Memory and handle leaks.
>  
> 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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