Happy Apache Cassandra 1: Setup

Cassandra Setup

Setup Cassandra

GettingStarted

Single Node

• Download
• tar xvf cassandra-*.tar.gz
• conf/cassandra.yaml
  

  data_file_directories: ./datacommitlog_directory: ./commitlogsaved_caches_directory: ./saved_cachescluster_name: 'cassandra 1.0 Cluster'

• conf/log4j-server.properties
  

  log4j.appender.R.File=./log/system.log

• mkdir data|commitlog|saved_caches|log
• Start up
  

  nohup bin/cassandra -f &

• Shut down
  

  kill -9 `ps -ef | grep cassandra | awk '{print $2}'`

• Node ring
  

  bin/nodetool -host localhost ring

Cluster

• each node, same as above
• conf/cassandra.yaml, comment out localhost
  

  #listen_address: localhost#rpc_address: localhostseed_provider:- seeds: "172.16.101.227,172.16.101.228"

• a quick setup is to  copy the cassandra from the first node and clean the data/system to avoid different node uses same token
  

  scp -r . 172.16.101.227:/home/xnavuser/cassandra-1.0.2scp -r . 172.16.101.228:/home/xnavuser/cassandra-1.0.2rm -rf data/system

Load_balancing

Load_balancing
If you uses even node number, the address token of each node would liketo split the range equally.
If you use odd node number, you can calculate new tokens for the nodes.
Keep your node token stable after start, otherwise, data may be can notbe found.

calculate tokes

def tokens(nodes):    for x in xrange(nodes):        print 2 ** 127 / nodes * x

move node

bin/nodetool -host 172.16.101.227 move 0bin/nodetool -host 172.16.101.228 move 34028236692093846346337460743176821145bin/nodetool -host 172.16.101.228 move 68056473384187692692674921486353642290bin/nodetool -host 172.16.101.228 move 102084710076281539039012382229530463435bin/nodetool -host 172.16.101.228 move 136112946768375385385349842972707284580

balance

Address         DC          Rack        Status State   Load            Owns    Token                                                                                                                      136112946768375385385349842972707284580     172.16.101.227  datacenter1 rack1       Up     Normal  54.64 KB        20.00%  0                                           172.16.101.228  datacenter1 rack1       Up     Normal  50.32 KB        20.00%  34028236692093846346337460743176821145      172.16.101.229  datacenter1 rack1       Up     Normal  54.56 KB        20.00%  68056473384187692692674921486353642290      172.16.101.230  datacenter1 rack1       Up     Normal  54.59 KB        20.00%  102084710076281539039012382229530463435     172.16.101.231  datacenter1 rack1       Up     Normal  15.42 KB        20.00%  136112946768375385385349842972707284580

Monitoring

http://wiki.apache.org/cassandra/Operations#Monitoring

• bin/cassandra-cli -h host
• bin/nodetool -h host cfstats|tpstats
• JMX
  • JConsole/JVisuialVM host:7199 (MBean)
  • MX4J, host:8081
    • Download mx4j-tools.jar from http://mx4j.sourceforge.net/
    • Add mx4j-tools.jar to the classpath (e.g. under lib/)
    • Start cassandra
    • Browser to http host:8081