Squirrel SQL Client and Cassandra
If you are using the Squirrel SQL Client, you need to add a Cassandra Driver. You can add the Cassandra Driver by using the CData JDBC Driver. Be sure to name it CData JDBC Driver for Cassandra. This driver will allow you to query Cassandra data. To install it, follow the instructions below.
CData JDBC Driver for Cassandra
You can use the CData JDBC Driver for Cassondra with your Java application. The driver uses a 3 or 4-tier architecture. The driver is compatible with most JDBC drivers. You should install the latest version before you start using it. It is available on GitHub. There are instructions on how to install the driver and set up SSL. The driver was written by CData using DataStax Java.
The CData JDBC Driver for Cassondra comes with the twig-jdbc package, which includes all necessary dependencies. You must install this package before you can install other Java packages on your machine. The package should contain the cassandra-twig-jdbc-2.1.1.jar file. After installing the driver, you should use the Cassandra Twig.
Once you have installed the JDBC driver, you should enable SQL queries to Cassandra. Squirrel SQL Client supports the CData JDBC Driver for Cassandra. To use it, you must create a new JDBC data source. In the Add Driver wizard, you can add a new driver. Choose the driver with a suitable name. The driver file is available in the lib folder. Then, in the Extra Class Path tab, select the driver file.
The Cassandra database can be used by the Tableau desktop application. The CData JDBC Driver for Cassandra supports the Tableau Desktop and Tableau Online. The CData Tableau Connector for Cassandra supports Tableau 2020.3 and higher. Once you have installed the driver, you can start your Tableau desktop or Cloud application. You can even install it on your Windows or Linux computer.
Windows Firewall blocking communication with Cassandra
If your Windows Firewall is blocking communication with Caslndra, you may be experiencing a load shedding problem. Load shedding occurs when the cluster or node is overloaded and is unable to process requests. When this occurs, the messages are dropped instead of being processed. Cassandra’s internal architecture allows for load shedding to avoid overloading. It uses the operating system’s virtual memory system to map on-disk files into the process address space of Cassandra. This virtual memory space is effectively unlimited on 64-bit systems.
To resolve this issue, you must first open ports in your firewall. If the ports are not open, the node will act as a standalone database server. If the ports are open, your Cassandra server will join the cluster. If the ports are not open, you should check with your systems administrator. You may need to open specific ports or add specific firewall rules to your firewall to allow communication with Cassandra.
If you have installed Cassandra on all nodes in the data center, you must configure the nodes for communication. If the nodes do not communicate, try restarting the nodes. Then, restart the Cassandra daemon on each node. To ensure that each node is communicating with the others, you can use the Cassandra command line utility to connect to each node.
Open ports required for bi-directional communication
Cassandra is a real-time, distributed database that powers many Java/J2EE applications. To use Cassandra, you must add the Cassandra Driver to your Squirrel SQL Client application. This driver is called CData JDBC Driver for Cassandra and can be found in the Squirrel repository.
Jessica Watson is a PHD holder from the University of Washington. She studied behavior and interaction between squirrels and has presented her research in several wildlife conferences including TWS Annual Conference in Winnipeg.