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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13225) Allow java to be started with numactl
Date Thu, 29 Jun 2017 03:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16067655#comment-16067655
] 

Allen Wittenauer commented on HADOOP-13225:
-------------------------------------------

I ended up writing up the cgexec example:  https://effectivemachines.com/2016/08/10/taking-control-of-daemons-in-apache-hadoop/

I'm thinking this should be closed as won't fix, given that I don't think we want to get into
the business of supporting any particular OS's special start tool given that user's can monkey
patch whatever support they want in 3.x.

> Allow java to be started with numactl
> -------------------------------------
>
>                 Key: HADOOP-13225
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13225
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: scripts
>            Reporter: Dave Marion
>            Assignee: Dave Marion
>         Attachments: HDFS-10370.004.patch, HDFS-10370-1.patch, HDFS-10370-2.patch, HDFS-10370-3.patch,
HDFS-10370-branch-2.004.patch
>
>
> Allow numactl constraints to be applied to the datanode process. The implementation I
have in mind involves two environment variables (enable and parameters) in the datanode startup
process. Basically, if enabled and numactl exists on the system, then start the java process
using it. Provide a default set of parameters, and allow the user to override the default.
Wiring this up for the non-jsvc use case seems straightforward. Not sure how this can be supported
using jsvc.



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