kafka源码编译
java -version #必须先安装jdk
brew install gradle安装的为gradle-5.0-bin.zip   #MAC系统需要安装gradle

安装完成之后没有gradlew 命令
https://downloads.gradle.org/distributions/gradle-5.0-all.zip
查找gradlew可执行文件
.//gradle-5.0/samples/userguide/wrapper/sha256-verification/gradlew
gradlew拷贝到kafka目录下

然后编译测试
zhangjinyudeMacBook-Pro:Downloads zhangjinyu$ cd kafka

Build a jar and run it
zhangjinyudeMacBook-Pro:kafka zhangjinyu$ ./gradlew jar

Build source jar
zhangjinyudeMacBook-Pro:kafka zhangjinyu$ ./gradlew srcJar

Build aggregated javadoc
zhangjinyudeMacBook-Pro:kafka zhangjinyu$ ./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
./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)
./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 ${project_dir}/build_eclipseas Eclipse's build directory. Eclipse's default build directory (${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



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