Cassandra Database(六)Multinode Cluster

Cassandra Database(6)Multinode Cluster

On MAC system, we can do like this.

>sudo ifconfig lo0 alias 127.0.0.2 up
>sudo ifconfig lo0 alias 127.0.0.3 up

Then we have the IP 127.0.0.1, 127.0.0.2, 127.0.0.3

If I change the configuration file cassandra.yaml and want to start 3 nodes on my local machine. I got errors.
Error Message:
Port already in use: 7199

Solution:
Right now, I do not know the solution. Just go on and try CCM

>git clone https://github.com/pcmanus/ccm.git

That is cool, my local machine python version is 2.7.5. 
sparkworker1:ccm carl$ python --version Python 2.7.5

>sudo easy_install pyYaml
>sudo ./setup.py install

>ccm help

>sudo ln -s /Users/carl/tool/ccm /opt/ccm

Create the Instance and Nodes
Tell ccm which version are we plan to use
>ccm create Test -v 2.0.4

Create a cluster named Test with version 2.0.4

Then create 3 nodes
>ccm populate -n 3

Start all the nodes
>ccm start

Then we have 3 nodes. We can connect as follow:
>cqlsh 127.0.0.3 9160

>ccm node1 ring Datacenter: datacenter1 ========== Address    Rack        Status State   Load            Owns                Token                                                                                                                 3074457345618258602                         127.0.0.1  rack1       Up     Normal  68.41 KB        66.67%              -9223372036854775808                        127.0.0.2  rack1       Up     Normal  35.92 KB        66.67%              -3074457345618258603                        127.0.0.3  rack1       Up     Normal  52.14 KB        66.67%              3074457345618258602  

This is the method to add one more node
>ccm add node4 -i 127.0.0.4 -j 7400 -b

That is cool, we can use java library to connect to the cluster
  val hosts = "127.0.0.1,127.0.0.2,127.0.0.3"
  val nativePort = 9042  //9042, 9160

  val keyspaceName = "books"
  val columnFamilyName = "books"
  val replicationStrategy = "SimpleStrategy"
  val replicationFactor = 2

But from the document, ccm is only support local machine right now. So looking forward to see the future version.

>nodetool -host 127.0.0.1 -p 7100 status Datacenter: datacenter1 ======================= Status=Up/Down |/ State=Normal/Leaving/Joining/Moving --  Address    Load       Owns (effective)  Host ID                               Token                                    Rack UN  127.0.0.1  40.74 KB   66.7%             03e83bcf-d409-4ea8-ac0c-3be00451cc1c  -9223372036854775808                     rack1 UN  127.0.0.2  51.02 KB   66.7%             133165df-a23a-4768-a339-62e453bb862d  -3074457345618258603                     rack1 UN  127.0.0.3  67.24 KB   66.7%             b1f7c514-a0b6-4266-8d1b-e89f4d13f43e  3074457345618258602                      rack1

References:
http://wiki.apache.org/cassandra/GettingStarted