Access Live Cassandra Data in AWS Lambda

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Cassandra JDBC Driver

Connect Java applications with the Cassandra real-time NoSQL cloud database service. Use Apache Cassandra as the big data backend that powers your Java/J2EE applications.



Connect to live Cassandra data in AWS Lambda using the CData JDBC Driver.

AWS Lambda is a compute service that lets you build applications that respond quickly to new information and events. AWS Lambda functions can work with live Cassandra data when paired with the CData JDBC Driver for Cassandra. This article describes how to connect to and query Cassandra data from an AWS Lambda function built in Eclipse.

At the time this article was written (June 2022), Eclipse version 2019-12 and Java 8 were the highest versions supported by the AWS Toolkit for Eclipse.

With built-in optimized data processing, the CData JDBC Driver offers unmatched performance for interacting with live Cassandra data. When you issue complex SQL queries to Cassandra, the driver pushes supported SQL operations, like filters and aggregations, directly to Cassandra and utilizes the embedded SQL engine to process unsupported operations client-side (often SQL functions and JOIN operations). In addition, its built-in dynamic metadata querying allows you to work with and analyze Cassandra data using native data types.

Gather Connection Properties and Build a Connection String

Set the Server, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

NOTE: To use the JDBC driver in an AWS Lambda function, you will need a license (full or trial) and a Runtime Key (RTK). For more information on obtaining this license (or a trial), contact our sales team.

Built-in Connection String Designer

For assistance constructing the JDBC URL, use the connection string designer built into the Cassandra JDBC Driver. Double-click the JAR file or execute the jar file from the command line.

java -jar cdata.jdbc.cassandra.jar

Fill in the connection properties (including the RTK) and copy the connection string to the clipboard.

Create an AWS Lambda Function

  1. Download the CData JDBC Driver for Cassandra installer, unzip the package, and run the JAR file to install the driver.
  2. Create a new AWS Lambda Java Project in Eclipse using the AWS Toolkit for Eclipse. You can follow the tutorial from AWS (amazon.com).

    For this article, set the Input Type for the project to "Custom" so we can enter a table name as the input.

  3. Add the CData JDBC Driver for Cassandra JAR file (cdata.jdbc.cassandra.jar) to the build path. The file is found in INSTALL_PATH\lib\.
  4. Add the following import statements to the Java class: import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement;
  5. Replace the body of the handleRequest method with the code below. Be sure to fill in the connection string in the DriverManager.getConnection method call.

    String query = "SELECT * FROM " + input; try { Class.forName("cdata.jdbc.cassandra.CassandraDriver"); } catch (ClassNotFoundException ex) { context.getLogger().log("Error: class not found"); } Connection connection = null; try { connection = DriverManager.getConnection("jdbc:cdata:cassandra:RTK=52465...;Database=MyCassandraDB;Port=7000;Server=127.0.0.1;"); } catch (SQLException ex) { context.getLogger().log("Error getting connection: " + ex.getMessage()); } catch (Exception ex) { context.getLogger().log("Error: " + ex.getMessage()); } if(connection != null) { context.getLogger().log("Connected Successfully!\n"); } ResultSet resultSet = null; try { //executing query Statement stmt = connection.createStatement(); resultSet = stmt.executeQuery(query); ResultSetMetaData metaData = resultSet.getMetaData(); int numCols = metaData.getColumnCount(); //printing the results while(resultSet.next()) { for(int i = 1; i <= numCols; i++) { System.out.printf("%-25s", (resultSet.getObject(i) != null) ? resultSet.getObject(i).toString().replaceAll("\n", "") : null ); } System.out.print("\n"); } } catch (SQLException ex) { System.out.println("SQL Exception: " + ex.getMessage()); } catch (Exception ex) { System.out.println("General exception: " + ex.getMessage()); } String output = "query: " + query + " complete"; return output;

Deploy and Run the Lambda Function

Once you build the function in Eclipse, you are ready to upload and run the function. In this article, the output is written to the AWS logs, but you can use this is a template to implement you own custom business logic to work with Cassandra data in AWS Lambda functions.

  1. Right-click the Package and select Amazon Web Services -> Upload function to AWS Lamba.
  2. Name the function, select an IAM role, and set the timeout value to a high enough value to ensure the function completes (depending on the result size of your query).
  3. Right-click the Package and select Amazon Web Services -> Run function on AWS Lambda and set the input to the name of the Cassandra object you wish to query (i.e. "Customer").
  4. After the job runs, you can view the output in the CloudWatch logs.

Free Trial & More Information

Download a free, 30-day trial of the CData JDBC Driver for Cassandra and start working with your live Cassandra data in AWS Lambda. Reach out to our Support Team if you have any questions.