Documentation:HTCC:Dep:InstallingAndDeployingCassandra:8.5.2DRAFT

Installing and Configuring Cassandra

Before you start installing and configuring Workspace Web Edition & Web Services, first you have to install and configure Cassandra version 1.2. The procedures below are meant to serve as a quick guide on how to do this — for more information, see the Cassandra 1.2 documentation.

Installing Cassandra

Complete this procedure for each Cassandra node.

Prerequisites

• You have installed the latest Java 1.7 JDK 64bit for Linux. For more information, refer to the Java documentation.

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_install_dir/conf/cassandra.yaml file. 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 with Multiple Nodes

This procedure shows you how to configure a three-node Cassandra cluster in a single datacenter. Complete the steps below for each node.

Important

The files modified in this procedure are typically found in the Cassandra_install_dir/conf directory.

Prerequisites

• Installing Cassandra

Start

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:

   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 Installing Cassandra.
6. Change endpoint_snitch to PropertyFileSnitch.
2. Save your changes and close the file.
3. Open the log4j-server.properties file and set the log4j.appender.R.File property to the directory you created in Step 5 of Installing Cassandra.
4. Save your changes and close the file.
5. Open the cassandra-topology.properties file and update for you cluster topology. For each node in your cluster, add the following line:

   [node]=[datacenter]:[rack]</nowiki>
   *<tt>[node]</tt> &mdash; The IP address of the node
   *<tt>[datacenter]</tt> &mdash; The name of the datacenter for this node.
   *<tt>[rack]</tt> &mdash; 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

6. Save your changes and close the file.

End

Configuring Cassandra with One Node

This procedure shows you how to configure a single Cassandra node. 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.

Prerequisites

• Installing Cassandra

Start

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

End

Verifying the Cassandra Installation

Prerequisites

• Configuring Cassandra with Multiple Nodes or Configuring Cassandra with One Node

Start

1. Start all Cassandra nodes using the following command: Cassandra_install_dir/bin/cassandra
2. Use the nodetool utility to verify that all nodes are connected by entering the following command: Cassandra_install_dir/bin/nodetool -h Cassandra_host ring The following is sample output for a multiple Cassandra node 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 Cassandra 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 Step

• Installing Workspace Web Edition & Web Services