Cassandra dead but pid file exists

Question

I have novice to cassandra and tried my hands to install cassandra-2.1.2 on centos 7.0. After complete installation execute cqlsh command and created few keyspace(s) and column

Answer 1

fix this issue, Edit the cassandra-env.sh:

sudo vi /etc/cassandra/conf/cassandra-env.sh

increase heap size for cassandra .. this should resolve your issue