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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2225) Turn the virtual memory check to be off by default
Date Tue, 16 Feb 2016 09:14:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-2225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15148306#comment-15148306
] 

Akira AJISAKA commented on YARN-2225:
-------------------------------------

I'm thinking the default value should be changed in branch-2 as well. We did some incompatible
changes in branch-2 if the change is really needed. There are 14 incompatible changes in 2.6.0/2.7.0.
https://issues.apache.org/jira/issues/?jql=project%20in%20(YARN%2C%20HADOOP%2C%20HDFS%2C%20MAPREDUCE)%20AND%20status%20in%20(Resolved%2C%20Closed)%20AND%20fixVersion%20in%20(2.6.0%2C%202.7.0)%20AND%20%22Hadoop%20Flags%22%20%3D%20%22Incompatible%20change%22

I fed up with hearing Java8 users' complaints, "The default value does not work.".

> Turn the virtual memory check to be off by default
> --------------------------------------------------
>
>                 Key: YARN-2225
>                 URL: https://issues.apache.org/jira/browse/YARN-2225
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-2225.patch
>
>
> The virtual memory check may not be the best way to isolate applications. Virtual memory
is not the constrained resource. It would be better if we limit the swapping of the task using
swapiness instead. This patch will turn this DEFAULT_NM_VMEM_CHECK_ENABLED off by default
and let users turn it on if they need to.



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