Awesone, thanks Bhuvan!
I have not worried about the JMX warning at this stage.
There were two other warnings, but I assume these are due to the size of my
Amazon Linux Image (and are not worth worrying about at this stage).
WARN 17:24:20 Small commitlog volume detected at /var/lib/cassandra/commitlog;
setting commitlog_total_space_in_mb to 1983. You can override this in
cassandra.yaml
WARN 17:24:20 Only 5.809GiB free across all data volumes. Consider adding more
capacity to your cluster or removing obsolete snapshots
Regarding the commitlog_total_space_in_mb property, I see from the
cassandra.yaml file:
The default value is the smaller of 8192, and 1/4 of the total space of
the commitlog volume.
Awesome, thanks again.
Steve
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> On 14/06/2016, at 12:49 AM, Bhuvan Rawal <bhu1ra...@gmail.com> wrote:
>
>
> Hi Steve,
>
> Please find the responses in line:
>
> WARN 15:41:58 Unable to lock JVM memory (ENOMEM). This can result in part of
> the JVM being swapped out, especially with mmapped I/O enabled. Increase
> RLIMIT_MEMLOCK or run Cassandra as root.
> You can edit - /etc/security/limits.conf and put these lines in there
>
> * - memlock unlimited
> * - nofile 100000
> * - nproc 32768
> * - as unlimited
>
> and reload the properties by command $ sudo sysctl -p
> and then checking it :
> $ ulimit -l
> and for the cassandra process by :
> $ cat /proc/<cassandra-pid>/limits
> Source - Datastax Troubleshooting
> <https://docs.datastax.com/en/cassandra/3.x/cassandra/troubleshooting/trblshootInsufficientResources.html>
>
> WARN 15:41:58 jemalloc shared library could not be preloaded to speed up
> memory allocations
> If you want to allocate off heap memory using jemalloc then uncomment this
> line in cassandra-env.sh and provide appropriate jemalloc path
> JVM_OPTS="$JVM_OPTS -Djava.library.path=<JEMALLOC_HOME>/lib/"
>
> WARN 15:41:58 JMX is not enabled to receive remote connections. Please see
> cassandra-env.sh for more info.
> By default JMX is enabled only for local connections, if you want to debug
> from a remote machine mark LOCAL_JMX=no in cassandra-env.sh
>
> WARN 15:41:58 Cassandra server running in degraded mode. Is swap disabled? :
> true, Address space adequate? : true, nofile limit adequate? : false, nproc
> limit adequate? : false
> You need to disable swap in order to avoid this message, using swap space can
> have serious performance implications. Make sure you disable fstab entry as
> well for swap partition.
>
> Thanks & Regards,
> Bhuvan
>
