ElasticSearch源碼分析（一）：源碼調(diào)試環(huán)境搭建（將ElasticSearch源碼導(dǎo)入IDEA）

? 本源碼閱讀環(huán)境是基于ElasticSearch 7.8.0版本，此版本需要IDEA版本至少為2020.1版

一、 準(zhǔn)備工作：

ElasticSearch Releases版本

• 下載ElasticSearch 7.8.0 源碼
• 下載ElasticSearch 7.8.0發(fā)行版
• 安裝Gradle（最低版本要求詳見(jiàn)源代碼: ~/buildSrc/src/main/resources: minimumCompilerVersion、minimumGradleVersion、minimumRuntimeVersion）
• 查看本機(jī)JDK版本（7.8.0編譯JDK版本最低為14）

二、 導(dǎo)入IDEA （CONTRIBUTING.md）

### Importing the project into IntelliJ IDEA

Elasticsearch builds using Java 14. When importing into IntelliJ you will need
to define an appropriate SDK. The convention is that **this SDK should be named
"14"** so that the project import will detect it automatically. For more details
on defining an SDK in IntelliJ please refer to [their documentation](https://www.jetbrains.com/help/idea/sdk.html#define-sdk).
SDK definitions are global, so you can add the JDK from any project, or after
project import. Importing with a missing JDK will still work, IntelliJ will
simply report a problem and will refuse to build until resolved.

You can import the Elasticsearch project into IntelliJ IDEA via:

 - Select **File > Open**
 - In the subsequent dialog navigate to the root `build.gradle` file
 - In the subsequent dialog select **Open as Project**

三、 本地運(yùn)行/調(diào)試配置

WechatIMG5.png

配置以下JVM參數(shù)：

-Des.path.conf=/Users/xuxl/Library/elasticsearch/elasticsearch-7.8.0/config
-Des.path.home=/Users/xuxl/Library/elasticsearch/elasticsearch-7.8.0
-Djava.security.policy=/Users/xuxl/Library/elasticsearch/elasticsearch-7.8.0/config/elasticsearch.policy
-Xms2g
-Xmx2g
-Dlog4j2.disable.jmx=true
-Des.path.plugins=/Users/xuxl/Library/elasticsearch/elasticsearch-7.8.0/plugins

配置 elasticsearch.policy文件（在elasticsearch-home/conf/創(chuàng)建文件），內(nèi)容如下：

grant{

permission javax.management.MBeanTruxtPermission "register";

permission javax.management.MBeanServerPermission "createMBeanServer";

permission java.lang.RuntimePermission "createClassLoader";

};

源碼文件server模塊中build.gradle中修改

compileOnly project(':libs:elasticsearch-plugin-classloader')

---》

compile project(':libs:elasticsearch-plugin-classloader')

ps:
需要配置node.name！