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Apache Kafka

See our web site for details on the project.

You need to have Gradle and Java installed.

Kafka requires Gradle 2.0 or higher.

Java 7 should be used for building in order to support both Java 7 and Java 8 at runtime.

First bootstrap and download the wrapper

cd kafka_source_dir
gradle

Now everything else will work.

Building a jar and running it

./gradlew jar  

Follow instructions in http://kafka.apache.org/documentation.html#quickstart

Building source jar

./gradlew srcJar

Building aggregated javadoc

./gradlew aggregatedJavadoc

Building javadoc and scaladoc

./gradlew javadoc
./gradlew javadocJar # builds a javadoc jar for each module
./gradlew scaladoc
./gradlew scaladocJar # builds a scaladoc jar for each module
./gradlew docsJar # builds both (if applicable) javadoc and scaladoc jars for each module

Running unit tests

./gradlew test

Forcing re-running unit tests w/o code change

./gradlew cleanTest test

Running a particular unit test

./gradlew -Dtest.single=RequestResponseSerializationTest core:test

Running a particular test method within a unit test

./gradlew core:test --tests kafka.api.ProducerFailureHandlingTest.testCannotSendToInternalTopic
./gradlew clients:test --tests org.apache.kafka.clients.MetadataTest.testMetadataUpdateWaitTime

Running a particular unit test with log4j output

Change the log4j setting in either clients/src/test/resources/log4j.properties or core/src/test/resources/log4j.properties

./gradlew -i -Dtest.single=RequestResponseSerializationTest core:test

Generating test coverage reports

./gradlew reportCoverage

Building a binary release gzipped tar ball

./gradlew clean
./gradlew releaseTarGz

The above command will fail if you haven't set up the signing key. To bypass signing the artifact, you can run:

./gradlew releaseTarGz -x signArchives

The release file can be found inside ./core/build/distributions/.

Cleaning the build

./gradlew clean

Running a task on a particular version of Scala (either 2.10.6 or 2.11.8)

Note that if building the jars with a version other than 2.10, you need to set the SCALA_BINARY_VERSION variable or change it in bin/kafka-run-class.sh to run the quick start.

You can pass either the major version (eg 2.11) or the full version (eg 2.11.8):

./gradlew -PscalaVersion=2.11 jar
./gradlew -PscalaVersion=2.11 test
./gradlew -PscalaVersion=2.11 releaseTarGz

Running a task for a specific project

This is for core, examples and clients

./gradlew core:jar
./gradlew core:test

Listing all gradle tasks

./gradlew tasks

Building IDE project

Note that this is not strictly necessary (IntelliJ IDEA has good built-in support for Gradle projects, for example).

./gradlew eclipse
./gradlew idea

Building the jar for all scala versions and for all projects

./gradlew jarAll

Running unit tests for all scala versions and for all projects

./gradlew testAll

Building a binary release gzipped tar ball for all scala versions

./gradlew releaseTarGzAll

Publishing the jar for all version of Scala and for all projects to maven

./gradlew uploadArchivesAll

Please note for this to work you should create/update ~/.gradle/gradle.properties and assign the following variables

mavenUrl=
mavenUsername=
mavenPassword=
signing.keyId=
signing.password=
signing.secretKeyRingFile=

Installing the jars to the local Maven repository

./gradlew installAll

Building the test jar

./gradlew testJar

Determining how transitive dependencies are added

./gradlew core:dependencies --configuration runtime

Determining if any dependencies could be updated

./gradlew dependencyUpdates

Running checkstyle on the java code

./gradlew checkstyleMain checkstyleTest

This will most commonly be useful for automated builds where the full resources of the host running the build and tests may not be dedicated to Kafka's build.

Common build options

The following options should be set with a -D switch, for example ./gradlew -Dorg.gradle.project.maxParallelForms=1 test.

  • org.gradle.project.mavenUrl: sets the URL of the maven deployment repository (file://path/to/repo can be used to point to a local repository).
  • org.gradle.project.maxParallelForks: limits the maximum number of processes for each task.
  • org.gradle.project.showStandardStreams: shows standard out and standard error of the test JVM(s) on the console.
  • org.gradle.project.skipSigning: skips signing of artifacts.

Running in Vagrant

See vagrant/README.md.

Contribution

Apache Kafka is interested in building the community; we would welcome any thoughts or patches. You can reach us on the Apache mailing lists.

To contribute follow the instructions here:

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