Starting and Stopping Cassandra

Starting and Stopping Cassandra as a service

                service cassandra start

                service cassandra stop

Cassandra operations in case of tarball installations:

                Starting Cassandra:        

                                $ cd <install_location>                  

                                $ bin/cassandra

                                - where <install_location> is where you have installed cassandra

                                - bin/cassandra will start cassandra as a background process

                                - bin/cassandra -f will start cassandra in foreground

                Stopping Cassandra:

                - As it's only a process and not a service you could do something like

                - where <pid> is what you get from ps auwx | grep cassandra

                                $ ps auwx | grep cassandra

                                $ sudo kill <pid>

Best Practices:

                - You could check if cassandra is running by checking the port, if you got a result back that
                   means it is running

                                $ lsof -i :9160

                - If you want to kill it , do kill -9 "pid"

                - Below procedure is suggested that minimizes the risk of something going wrong.

                - The other advantage of clean Cassandra restart procedure is saving some startup time.

                - A two-node cluster with nodes known as node01.hostserver.net and node02.hostserver.net :

                                 # nodetool -h node01.hostserver.net disablegossip         

                                 # nodetool -h node01.hostserver.net disablethrift

                                 # nodetool -h node01.hostserver.net drain

                disablegossip :  Because it makes node look like “dead” for other nodes.

                disablethrift   :  Turning it off makes Cassandra unable to accept user’s requests because it 

                                           disables Cassandra’s RPC server.

                drain              :   It flushes column families. In other words – converts Memtables into

                                            immutable SSTables, emptying Commit Log this way