Apache Kafka

See our web site for details on the project.

You need to have Gradle and Java installed.

Kafka requires Gradle 5.0 or higher.

Java 8 should be used for building in order to support both Java 8 and Java 11 at runtime.

Scala 2.12 is used by default, see below for how to use a different Scala version or all of the supported Scala versions.

First bootstrap and download the wrapper

cd kafka_source_dir
gradle

Now everything else will work.

Build a jar and run it

./gradlew jar

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

Build source jar

./gradlew srcJar

Build aggregated javadoc

./gradlew aggregatedJavadoc

Build 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

Run unit/integration tests

./gradlew test # runs both unit and integration tests
./gradlew unitTest
./gradlew integrationTest

Force re-running tests without code change

./gradlew cleanTest test
./gradlew cleanTest unitTest
./gradlew cleanTest integrationTest

Running a particular unit/integration test

./gradlew clients:test --tests RequestResponseTest

Running a particular test method within a unit/integration test

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

Running a particular unit/integration test with log4j output

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

./gradlew clients:test --tests RequestResponseTest

Generating test coverage reports

Generate coverage reports for the whole project:

./gradlew reportCoverage

Generate coverage for a single module, i.e.:

./gradlew clients:reportCoverage

Building a binary release gzipped tar ball

./gradlew clean releaseTarGz

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

./gradlew clean releaseTarGz -x signArchives

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

Cleaning the build

./gradlew clean

Running a task with a particular version of Scala (either 2.11.x or 2.12.x)

Note that if building the jars with a version other than 2.12.x, you need to set the SCALA_VERSION variable or change it in bin/kafka-run-class.sh to run the quick start.

You can pass either the major version (eg 2.12) or the full version (eg 2.12.7):

./gradlew -PscalaVersion=2.12 jar
./gradlew -PscalaVersion=2.12 test
./gradlew -PscalaVersion=2.12 releaseTarGz

Running a task with all scala versions

Append All to the task name:

./gradlew testAll
./gradlew jarAll
./gradlew releaseTarGzAll

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

The eclipse task has been configured to use ${project_dir}/build_eclipse as Eclipse's build directory. Eclipse's default build directory (${project_dir}/bin) clashes with Kafka's scripts directory and we don't use Gradle's build directory to avoid known issues with this configuration.

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_USER_HOME}/gradle.properties (typically, ~/.gradle/gradle.properties) and assign the following variables

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

Publishing the streams quickstart archetype artifact to maven

For the Streams archetype project, one cannot use gradle to upload to maven; instead the mvn deploy command needs to be called at the quickstart folder:

cd streams/quickstart
mvn deploy

Please note for this to work you should create/update user maven settings (typically, ${USER_HOME}/.m2/settings.xml) to assign the following variables

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                       https://maven.apache.org/xsd/settings-1.0.0.xsd">
...                           
<servers>
   ...
   <server>
      <id>apache.snapshots.https</id>
      <username>${maven_username}</username>
      <password>${maven_password}</password>
   </server>
   <server>
      <id>apache.releases.https</id>
      <username>${maven_username}</username>
      <password>${maven_password}</password>
    </server>
    ...
 </servers>
 ...

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 code quality checks

There are two code quality analysis tools that we regularly run, spotbugs and checkstyle.

Checkstyle

Checkstyle enforces a consistent coding style in Kafka. You can run checkstyle using:

./gradlew checkstyleMain checkstyleTest

The checkstyle warnings will be found in reports/checkstyle/reports/main.html and reports/checkstyle/reports/test.html files in the subproject build directories. They are also are printed to the console. The build will fail if Checkstyle fails.

Spotbugs

Spotbugs uses static analysis to look for bugs in the code. You can run spotbugs using:

./gradlew spotbugsMain spotbugsTest -x test

The spotbugs warnings will be found in reports/spotbugs/main.html and reports/spotbugs/test.html files in the subproject build directories. Use -PxmlSpotBugsReport=true to generate an XML report instead of an HTML one.

Common build options

The following options should be set with a -P switch, for example ./gradlew -PmaxParallelForks=1 test.

commitId: sets the build commit ID as .git/HEAD might not be correct if there are local commits added for build purposes.
mavenUrl: sets the URL of the maven deployment repository (file://path/to/repo can be used to point to a local repository).
maxParallelForks: limits the maximum number of processes for each task.
showStandardStreams: shows standard out and standard error of the test JVM(s) on the console.
skipSigning: skips signing of artifacts.
testLoggingEvents: unit test events to be logged, separated by comma. For example ./gradlew -PtestLoggingEvents=started,passed,skipped,failed test.
xmlSpotBugsReport: enable XML reports for spotBugs. This also disables HTML reports as only one can be enabled at a time.

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:

https://kafka.apache.org/contributing.html

解析文章

Kafka源码分析-网络层-1
Kafka源码分析-网络层-2
Kafka源码分析-网络层-3
Kafka源码分析-配置文件
Kafka源码分析-启动流程
Kafka基础组件和辅助类库简介
Kafka的Request和Response
Kafka初始化流程与请求处理
KafkaController分析1-选主和Failover
KafkaController分析2-NetworkClient分析
KafkaController分析3-ControllerChannelManager
KafkaController分析4-Partition选主
KafkaController分析5-Partition状态机
KafkaController分析6-Replica状态机
KafkaController分析7-启动流程
Kafka集群建立过程分析
Kafka集群Metadata管理
KafkaController分析8-broker挂掉
ReplicaManager源码解析1-相关基础类库
ReplicaManager源码解析2-LeaderAndIsr 请求响应
Kafka中的时间轮
DelayedOperationPurgatory--谜之炼狱
Kafka的日志管理模块--LogManager
Kafka中Message存储相关类大揭密
Kafka消息的磁盘存储
Kafka中的消息操作的层级调用关系
Kafka是如何处理客户端发送的数据的?
ISR列表是如何变化的?
Kafka的消息是如何被消费的?
Kafka的日志清理-LogCleane
Kafka运维填坑
Kafka重置消费的Offset
记一次Kafka集群的故障恢复
使用多数据中心部署来应对灾难恢复(一)
使用多数据中心部署来应对灾难恢复(二)
优化你的Apache Kafka部署

链接：https://www.jianshu.com/p/aa274f8fe00f

hbally / kafka-2.3.0