title: What does these Cassandra warnings mean: Unable to lock JVM memory and MemoryMeter uninitialized
body: <p>I'm getting the following warnings on <a href="http://en.wikipedia.org/wiki/Apache_Cassandra" rel="nofollow noreferrer">Cassandra</a> - what does it mean? And is it an issue?
  And how can I solve this?</p>
  <blockquote>
  <p>WARN 15:32:06,772 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.</p>
  <p>WARN 15:33:20,860 MemoryMeter uninitialized (jamm not specified as java agent); assuming liveRatio of 10.0.  Usually this means cassandra-env.sh disabled jamm because you are using a buggy JRE; upgrade to the Sun JRE instead</p>
  </blockquote>
  <p>I'm using Cassandra 1.1.2.</p>