vroyer/spark-cassandra-connector

If you write a Spark application that needs access to Cassandra, this library is for you

Spark Cassandra Connector

Lightning-fast cluster computing with Spark and Cassandra

This library lets you expose Cassandra tables as Spark RDDs, write Spark RDDs to Cassandra tables, and execute arbitrary CQL queries in your Spark applications.

Features

• Compatible with Apache Cassandra version 2.0 or higher (see table below)
• Compatible with Apache Spark 1.0 through 1.4 (see table below)
• Compatible with Scala 2.10 and 2.11
• Exposes Cassandra tables as Spark RDDs
• Maps table rows to CassandraRow objects or tuples
• Offers customizable object mapper for mapping rows to objects of user-defined classes
• Saves RDDs back to Cassandra by implicit saveToCassandra call
• Join with a subset of Cassandra data using joinWithCassandraTable call
• Partition RDDs according to Cassandra replication using repartitionByCassandraReplica call
• Converts data types between Cassandra and Scala
• Supports all Cassandra data types including collections
• Filters rows on the server side via the CQL WHERE clause
• Allows for execution of arbitrary CQL statements
• Plays nice with Cassandra Virtual Nodes
• Works with PySpark DataFrames

Version Compatibility

The connector project has several branches, each of which map into different supported versions of Spark and Cassandra. Refer to the compatibility table below which shows the major.minor version range supported between the connector, Spark, Cassandra, and the Cassandra Java driver:

Connector	Spark	Cassandra	Cassandra Java Driver
1.4	1.4	2.1.5+	2.1
1.3	1.3	2.1.5+	2.1
1.2	1.2	2.1, 2.0	2.1
1.1	1.1, 1.0	2.1, 2.0	2.1
1.0	1.0, 0.9	2.0	2.0

Download

This project has been published to the Maven Central Repository. For SBT to download the connector binaries, sources and javadoc, put this in your project SBT config:

libraryDependencies += "com.datastax.spark" %% "spark-cassandra-connector" % "1.4.0-M3"

If you want to access the functionality of Connector from Java, you may want to add also a Java API module:

libraryDependencies += "com.datastax.spark" %% "spark-cassandra-connector-java" % "1.4.0-M3"

Building

See Building And Artifacts

Documentation

• Quick-start guide
• Connecting to Cassandra
• Loading datasets from Cassandra
• Server-side data selection and filtering
• Working with user-defined case classes and tuples
• Saving datasets to Cassandra
• Customizing the object mapping
• Using Connector in Java
• Spark Streaming with Cassandra
• About The Demos
• The spark-cassandra-connector-embedded Artifact
• Performance monitoring
• Building And Artifacts
• The Spark Shell
• DataFrames
• Python
• Frequently Asked Questions

Community

Reporting Bugs

New issues may be reported using JIRA. Please include all relevant details including versions of Spark, Spark Cassandra Connector, Cassandra and/or DSE. A minimal reproducible case with sample code is ideal.

Mailing List

Questions and requests for help may be submitted to the user mailing list.

Contributing

To develop this project, we recommend using IntelliJ IDEA. Make sure you have installed and enabled the Scala Plugin. Open the project with IntelliJ IDEA and it will automatically create the project structure from the provided SBT configuration.

Before contributing your changes to the project, please make sure that all unit tests and integration tests pass. Don't forget to add an appropriate entry at the top of CHANGES.txt. Finally open a pull-request on GitHub and await review.

Please prefix pull request description with the JIRA number, for example: "SPARKC-123: Fix the ...".

Testing

To run unit and integration tests:

./sbt/sbt test
./sbt/sbt it:test

By default, integration tests start up a separate, single Cassandra instance and run Spark in local mode. It is possible to run integration tests with your own Cassandra and/or Spark cluster. First, prepare a jar with testing code:

./sbt/sbt test:package

Then copy the generated test jar to your Spark nodes and run:

export IT_TEST_CASSANDRA_HOST=<IP of one of the Cassandra nodes>
export IT_TEST_SPARK_MASTER=<Spark Master URL>
./sbt/sbt it:test

License

Copyright 2014-2015, DataStax, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.