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Installing and Configuring Cassandra

Cassandra version 1.2 is mandatory for Workspace Web Edition & Web Services and must be installed and configured prior to starting the installation and configuration of Workspace Web Edition & Web Services.

Important
For more details about Cassandra, refer to the Cassandra documentation for version 1.2.

The procedures on this page are intended to serve as a quick guide to installing and configuring Cassandra.

Installing Cassandra

Complete this procedure for each Cassandra node.

Prerequisites

Start

  1. Download the latest 1.2.x version of Cassandra.
  2. Copy the Cassandra archive to the installation directory. For example, /usr/local
  3. Use a tar utility to extract the files. For example, tar -zxvf apache-cassandra-1.2.15-bin.tar.gz
  4. Add directories for data, commitlog, and saved_caches. You can create these directories anywhere or in the default locations configured in the cassandra.yaml. For example:
    • /var/lib/cassandra/data
    • /var/lib/cassandra/commitlog
    • /var/lib/cassandra/saved_caches
  5. Add a directory for logging. You can create this directory anywhere, such as /var/log/cassandra/.

End

Configuring Cassandra

This procedure shows you how to configure a three-node Cassandra cluster in a single datacenter.

Important
The files modified in this procedure are typically found in the [Cassandra install dir]/conf directory.

Start
Complete the following steps for each Cassandra node:

  1. Modify the cassandra.yaml file:
    1. Set the cluster_name. It must be the same name on all nodes.
    2. Set the initial_token according to the node's place in ring. It must be one of the following: 
      3. Node #1:  -9223372036854775808
Node #2:  -3074457345618258603
Node #3:   3074457345618258602
      Important
      The tokens shown here can be used for a three-node Cassandra cluster in a single datacenter. If you are using a different topology or cluster size, consult the Cassandra documentation.
    3. Set seeds to the list of host names of all nodes. For example: -seeds: “node1, node2, node3”
    4. Set listen_address and rpc_address to the host name.
    5. Set data_file_directories, commitlog_directory, and saved_caches_directory to the directories you created in Step 4 of the Installing Cassandra procedure.
    6. Change endpoint_snitch to PropertyFileSnitch.
    7. Save your changes and close the file.
  2. Open the log4j-server.properties file and set the log4j.appender.R.File property to the directory you created in Step 5 of the Installing Cassandra procedure.
  3. Save your changes and close the file.
  4. Open the cassandra-topology.properties file and update for you cluster topology. For each node in your cluster, add the following line: 
    5. [node]=[datacenter]:[rack]
  • [node] — The IP address of the node
  • [datacenter] — The name of the datacenter for this node.
  • [rack] — The name of the rack for this node.

The following is a sample cassandra-topology.properties file for a Single Datacenter scenario: 

192.0.2.10=datacenter1:rack1
192.0.2.11=datacenter1:rack1
192.0.2.12=datacenter1:rack1
  • Save your changes and close the file.

    • End

    Configuring Cassandra with only one node

    This procedure shows you how to configure a one-node Cassandra. This could be valuable for a lab or a simple test installation.

    Important
    The files modified in this procedure are typically found in the [Cassandra install dir]/conf directory.

    Start
    Complete the following steps for each Cassandra node:

    1. Modify the cassandra.yaml file:
      1. Set the cluster_name. It must be the same name on all nodes.
      2. Set seeds to the list of host names of all nodes. For example: -seeds: “127.0.0.1”
      3. Set listen_address and rpc_address to the host name.
      4. Set data_file_directories, commitlog_directory, and saved_caches_directory to the directories you created in Step 4 of the Installing Cassandra procedure.
      5. Save your changes and close the file.
    2. Open the log4j-server.properties file and set the log4j.appender.R.File property to the directory you created in Step 5 of the Installing Cassandra procedure.
    3. Save your changes and close the file.
    4. Save your changes and close the file.

    End

    Verifying the Cassandra Installation

    Start

    1. Start all Cassandra nodes using the following command:
      2. [cassandra install dir]/bin/cassandra
    2. Use the nodetool utility to verify that all nodes have connected by entering the following command:
      3. [cassandra install dir]/bin/nodetool -h [cassandra host] ring

      The following is sample output for a Single Datacenter scenario: 

      /genesys/apache-cassandra-1.2/bin$ ./nodetool ring
Address     DC           Rack   Status  State   Load      Owns     Token
192.0.2.10  datacenter1  rack1  Up      Normal  14.97 MB  100.00%  -9223372036854775808
192.0.2.11  datacenter1  rack1  Up      Normal  14.97 MB  100.00%  -3074457345618258603
192.0.2.12  datacenter1  rack1  Up      Normal  14.97 MB  100.00%   3074457345618258602


      The following is sample output for a Single Node scenario: 

      /genesys/apache-cassandra-1.2/bin$ ./nodetool ring
Address         DC          Rack        Status State   Load            Effective-Ownership Token                                       
127.0.0.1       datacenter1 rack1       Up     Normal  1.89 MB         100.00%             76880863635469966884037445232169973201

    End

    Next Steps

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