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https://issues.apache.org/jira/browse/CASSANDRA-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113271#comment-13113271
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Peter Schuller commented on CASSANDRA-3245:
-------------------------------------------

Or we could do something seemingly ugly but probably very effective and safe: 
Try running "ls -d / > /dev/null" with numactl and if that fails, assume it is 
because numactl isn't working. That should hopefully work in pretty much any 
environment.

I'll submit a patch soonish.


> Don't fail when numactl is installed, but NUMA policies are not supported
> -------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3245
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3245
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Packaging
>    Affects Versions: 1.0.0
>         Environment: Any Linux system where a 'numactl' executable is 
> available, but no NUMA policies are actually supported. EC2 nodes are easy 
> examples of environments with no NUMA policy support.
>            Reporter: paul cannon
>            Assignee: Peter Schuller
>            Priority: Minor
>             Fix For: 1.0.0
>
>
> When numactl is installed but NUMA policies are not supported, trying to run 
> cassandra gives only:
> {noformat}
> numactl: This system does not support NUMA policy
> {noformat}
> ..and the startup script fails there.
> We should probably fail a little more gracefully. Possibly the best way to 
> tell if numactl will work is by using:
> {noformat}
> numactl --hardware
> {noformat}
> but I don't have ready access to a machine with proper NUMA support at the 
> moment so I can't check how easy it is to tell the difference in the output.
> It looks just as reliable (if possibly a bit more brittle) to check for the 
> existence of the directory {{/sys/devices/system/node}}. If that directory 
> doesn't exist, we shouldn't even try to use or run numactl.

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