[jira] [Updated] (CASSANDRA-3245) Don't fail when numactl is installed, but NUMA policies are not supported

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-3245:
--------------------------------------

         Reviewer: thepaul
      Component/s:     (was: Tools)
                   Packaging
    Fix Version/s: 1.0.0
         Assignee: Peter Schuller

> 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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