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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 Mon, 14 May 2018 18:52:00 GMT

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

Giovanni Matteo Fumarola updated HADOOP-15461:
----------------------------------------------
    Description: 
This Jira tracks the effort for
 * Move away from an external processese (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

  was:
[Description from ]
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.


> 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
>            Priority: Major
>
> This Jira tracks the effort for
>  * Move away from an external processese (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



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