Cassandra
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The Cassandra data source supports Cassandra server versions 1.2.x and upwards, and works with Cassandra Query Language version 3 (CQL3).
You can create your Cassandra data source as you create the data service: Follow the steps from 1 to 3 in creating a data service using various data sources. When you get to the Add New Data Source screen, select Cassandra as the data source type. The Cassandra-specific options will be available for editing.
The following describes the properties supported by the Cassandra datasource. For more detailed information about the functionality of the underlying connector, check http://www.datastax.com/documentation/developer/java-driver/2.0/index.html.
| Data Source Property | Description |
|---|---|
| Cassandra Servers* | Comma separated list of host names of Cassandra servers. |
| Keyspace | The default keyspace used by the Cassandra session. |
| Port | The port of Cassandra servers. |
| Cluster Name | The Cassandra cluster name. |
| Compression | Compression used in communication. |
| User Name | The authenticating user's username. |
| Password | The authenticating user's password. |
| Load Balancing Policy | The client load balancing policy on how calls should be made to the provided servers. |
| Enable JMX Reporting | Enable JMX statistics of the connector. |
| Enable Metrics | Enable metrics of the connector. |
| Local Core Connections Per Host | Connection pooling: Local core connections per server host. |
| Remote Core Connections Per Host | Connection pooling: Remote core connections per server host. |
| Local Max.Connections Per Host | Connection pooling: Maximum local connections per server host. |
| Remote Max.Connections Per Host | Connection pooling: Remote max connections per server host. |
| Local Max.Simultaneous Requests Per Connection Threshold | Connection pooling: Number of simultaneous requests on all local connections to a host. If the number of requests exceeds this number, new connections are created. |
| Remote Max.Simultaneous Requests Per Connection Threshold | Connection pooling: Number of simultaneous requests on all remote connections to a host. If the number of requests exceeds this number, new connections are created. |
| Local Min.Simultaneous Requests Per Connection Threshold | Connection pooling: Number of simultaneous requests on a connection. If the number of requests is less than this number, the remote connections in excess are reclaimed. |
| Remote Min.Simultaneous Requests Per Connection Threshold | Connection pooling: Number of simultaneous requests on a connection. If the number of requests is less than this number, the remote connections in excess are reclaimed. |
| Protocol Version | The native protocol version to use. By default, it auto connects. "2" for Cassandra versions 2.0 and upwards, and "1" for Cassandra version 1.2.x. |
| Consistency Level | The consistency level used for queries. |
| Fetch Size | Fetch size used by queries. |
| Serial Consistency Level | The serial consistency level used for queries. |
| Reconnection Policy | The reconnection policy used for the cluster. |
| Constant Reconnection Policy Delay | If "ConstantReconnectionPolicy" is used for Reconnection Policy, this represents the constant wait time between reconnection attempts in milliseconds. |
| Exponential Reconnection Policy Base Delay | If "ExponentialReconnectionPolicy" is used for Reconnection Policy, this represent the base delay in milliseconds. |
| Exponential Reconnection Policy Max. Delay | If "ExponentialReconnectionPolicy" is used for Reconnection Policy, this represent the maximum delay in milliseconds. |
| Retry Policy | Configured the retry policy in this cluster. |
| Connection Timeout | The socket connection timeout in milliseconds. |
| Keep Alive | Set if socket keeps alive. |
| Read Timeout | Set per host socket read timeout in milliseconds. |
| Receive Buffer Size | The socket receive buffer size. |
| Send Buffer Size | The socket send buffer size. |
| Reuse Address | The socket re-use address. |
| So Linger | The socket linger on value. |
| TCP no Delay | Set socket TCP to no delay. |
| Enable SSL | Enable SSL. |
| Disable Native Batch Requests | Disables native Cassandra batch requests, and reverts to emulated batch requests. |
* Mandatory fields.
To write a query to this datasource, see Writing Data Service Queries.
Queries based on Cassandra datasources, currently do not support named parameters or array type parameters.
A sample based on the Cassandra datasource can be found here: Cassandra Sample.