Documentation:HTCC:Dep:InitializingCassandra:8.5.2

Initializing Cassandra

Creating the Cassandra keyspace

The procedures below describe how to create the Cassandra keyspace for the following scenarios:

• Development — 1 Cassandra node (appropriate for a development or lab environment)
• Single Datacenter — 1 datacenter with a minimum of three Cassandra nodes
• Two Datacenters — 2 datacenters with a minimum of three Cassandra nodes in each datacenter

Important

For more complex Cassandra deployments, please consult with Genesys.

Select a tab below for the procedure that matches your deployment scenario.

Creating the Cassandra keyspace (1 Cassandra node)

Start

1. Copy the ks-schema-local.txt file from installation_CD/data to the Cassandra node host.
2. By default, the replication factor is set to 1. Since this is a single node deployment, you don't need to modify this value. Refer to the Cassandra documentation for more information about replication factors.

and strategy_options = {replication_factor : 1}

3. Run the following command to create the Cassandra schema:

cassandra_install_dir/bin/cassandra-cli -h cassandra_host --file ks-schema-local.txt

• cassandra_host is the host name (fully qualified domain name) or IP address of the Cassandra node.

End

Creating the Cassandra keyspace (1 datacenter)

Complete the following procedure on one node in your Cassandra cluster.

Start

1. Copy the ks-schema-prod.txt file from installation_CD/data to the Cassandra node host.
2. For fault tolerance, Genesys recommends that you use at least 3 Cassandra nodes and set the replication factor to 3. Refer to the Cassandra documentation for more information about replication factors. To modify this value, change the following line:

and strategy_options = {replication_factor : <replication-factor-in-your-lab>}

3. Run the following command to create the Cassandra schema:

cassandra_install_dir/bin/cassandra-cli -h cassandra_host --file ks-schema-prod.txt

• cassandra_host is the host name (fully qualified domain name) or IP address of the Cassandra node

End

Creating the Cassandra keyspace (2 datacenters)

Complete the following procedure on one node in your Cassandra cluster.

Start

1. Copy the ks-schema-prod_HA.txt file from installation_CD/data to the Cassandra node host.
2. Modify the following line:

   with strategy_options ={ AZ1 : 3, AZ2 : 3 }

   1. Add the datacenter name. You can use nodetool to find the name of the datacenter by examining the output of "nodetool ring" (the tool is located in the bin directory of Cassandra). The following is sample output from the nodetool:

   /genesys/apache-cassandra-1.1.6/bin$ ./nodetool ring
   Address        DC           Rack   Status  State   Load      Owns     Token
   192.0.2.10     datacenter1  rack1  Up      Normal  14.97 MB  100.00%  0
   198.51.100.10  datacenter2  rack1  Up      Normal  14.97 MB  100.00%  100
   192.0.2.11     datacenter1  rack1  Up      Normal  14.97 MB  100.00%  56713727820156410577229101238628035242
   198.51.100.11  datacenter2  rack1  Up      Normal  14.97 MB  100.00%  56713727820156410577229101238628035242
   192.0.2.12     datacenter1  rack1  Up      Normal  14.97 MB  100.00%  113427455640312821154458202477256070484
   198.51.100.12  datacenter2  rack1  Up      Normal  14.97 MB  100.00%  113427455640312821154458202477256070484

   2. Add the replication factor. Refer to the Cassandra documentation for more information about replication factors.

   Based on the nodetool output above, your line might be:

   with strategy_options ={ datacenter1 : 3, datacenter2 : 3 }

3. Run the following command to create the Cassandra schema:

cassandra_install_dir/bin/cassandra-cli -h cassandra_host --file ks-schema-prod_HA.txt</nowiki>

• cassandra_host is the host name (fully qualified domain name) or IP address of the Cassandra node

End

Creating the column families

Complete the following procedure on one node in your Cassandra cluster.

Start

1. Copy the cf-schema.txt file from installation_CD/data to the Cassandra node host.
2. Run the following command to create the Cassandra schema:

cassandra_install_dir/bin/cassandra-cli -h cassandra_host --file cf-schema.txt

• cassandra_host is the host name (fully qualified domain name) or IP address of the Cassandra node

End

Next step

• Deploying the web application