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
