Apache Samza is a distributed stream processing framework. It uses Apache Kafka for messaging, and Apache Hadoop YARN to provide fault tolerance, processor isolation, security, and resource management.
Samza's key features include:
Check out Hello Samza to try Samza. Read the Background page to learn more about Samza.
To build Samza from a git checkout, run:
./gradlew clean build
To build Samza from a source release, it is first necessary to download the gradle wrapper script above. This bootstrapping process requires Gradle to be installed on the source machine. Gradle is available through most package managers or directly from its website. To bootstrap the wrapper, run:
gradle -b bootstrap.gradle
After the bootstrap script has completed, the regular gradlew instructions below are available.
This project is built with Java 8 and can run in a Java 8 runtime enviornment. Additionally, it also supports running in a Java 11 runtime environment. If you intend to use Samza in a Java 11 runtime environment, it means you will also need to use YARN 3.3.4+ and in which case, you should also use the
samza-yarn3 module (built with YARN 3.3.4) instead of the
samza-yarn (built with YARN 2.10.1). There is also a
samza-shell-yarn3 that depends on the
samza-yarn3 module, so use that shell module if you intend on using Yarn 3.
Samza builds with Scala 2.11 or 2.12 and YARN 2.10.1, by default. Use the -PscalaSuffix switches to change Scala versions. Samza supports building Scala with 2.11 and 2.12 and provides a YARN 2 module (
samze-yarn) and a YARN 3 module (
NOTE: Some modules currently do not officially support Java 11 Runtime and are still using the YARN 2.10.1 dependency:
./gradlew -PscalaSuffix=2.12 clean build
Also, you can make use of
bin/check-all.sh in order to test multiple variants of Java JDKs, Scala, and Yarn.
To run all tests:
./gradlew clean test
To run a single test:
./gradlew clean :samza-test:test -Dtest.single=TestStatefulTask
To run key-value performance tests:
./gradlew samza-shell:kvPerformanceTest -PconfigPath=file://$PWD/samza-test/src/main/config/perf/kv-perf.properties
To run yarn integration tests:
./bin/integration-tests.sh <dir> yarn-integration-tests
To run standalone integration tests:
./bin/integration-tests.sh <dir> standalone-integration-tests
./gradlew checkstyleMain checkstyleTest
To run a job (defined in a properties file):
./gradlew samza-shell:runJob -PconfigPath=/path/to/job/config.properties
To inspect a job's latest checkpoint:
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties
To modify a job's checkpoint (assumes that the job is not currently running), give it a file with the new offset for each partition, in the format
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties \ -PnewOffsets=file:///path/to/new/offsets.properties
To get Eclipse projects, run:
For IntelliJ, run:
To start contributing on Samza please read Rules and Contributor Corner. Notice that Samza git repository does not support git pull request.
Apache Samza is a top level project of the Apache Software Foundation.