Unable to write to the standard tmp directory for JNA in DataStax Enterprise  

Steps to fix write problem to tmp directory.

Set JNA temporary path to be executable. In cassandra-env.sh, add the line:
JVM_OPTS="$JVM_OPTS -Djna.tmpdir=/var/tmp"
cassandra-env.sh
Version File location
DataStax Enterprise Installer-Services and package installations /etc/dse/cassandra/cassandra-env.sh
DataStax Enterprise Installer-No Services and tarball installations install_location/resources/cassandra/conf
Apache Cassandra package installations /etc/cassandra/cassandra-env.sh
Apache Cassandra tarball installations install_location/conf/cassandra-env.sh