JNA link issue while starting cassandra RHEL 6.5

Question

I am trying to setup cassandra in my RHEL 6.5 server. When i start cassandara, i get an ERROR related to JNA. The exception says class not found. However, I see in the logs

Answer 1

I went through the code in CLibrary.java and found following code where the exception is caught -

catch (UnsatisfiedLinkError e)
{
    logger.warn("JNA link failure, one or more native method will be unavailable.");
    logger.trace("JNA link failure details: {}", e.getMessage());
}

I restarted cassandra by changing the log-level in conf/logback.xml to TRACE, to print that extra detail -

<logger name="org.apache.cassandra" level="TRACE"/>

I could now see the real issue -

/tmp/jna-3506402/jna6068045839690239595.tmp: failed to map segment from shared object: Operation not permitted

This issue is caused due to noexec flag on the /tmp folder.

I then decided to change the tmp folder by changing tmpdir using option:
-Djava.io.tmpdir=/home/cassandra/tmp That fixed the issue.

I added the options in cassandra-env.sh file. Added following statement -

JVM_OPTS="$JVM_OPTS -Djava.io.tmpdir=/home/cassandra/tmp"