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Posted to common-issues@hadoop.apache.org by "Íñigo Goiri (JIRA)" <ji...@apache.org> on 2018/06/06 18:37:00 UTC
[jira] [Commented] (HADOOP-15461) Improvements over the Hadoop
support with Windows
[ https://issues.apache.org/jira/browse/HADOOP-15461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16503726#comment-16503726 ]
Íñigo Goiri commented on HADOOP-15461:
--------------------------------------
As this may involve a substantial churn in code, I created branch HADOOP-15461 to work on this.
The code is relatively not modified but I think is better to isolated the work.
> 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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