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From "paul cannon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3245) Don't fail when numactl is installed, but NUMA policies are not supported
Date Fri, 23 Sep 2011 02:57:26 GMT
Don't fail when numactl is installed, but NUMA policies are not supported
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                 Key: CASSANDRA-3245
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3245
             Project: Cassandra
          Issue Type: Bug
          Components: Tools
    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
            Priority: Minor


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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