elasticsearch源码简读：程序启动

启动类：

1.org.elasticsearch.bootstrap.Elasticsearch

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1. public static void main(String[] args) {  
2.     Bootstrap.main(args);  
3. }  

以下具体实现：
1.生成PID文件
2.初始化配置，日志初始化
3.设置是否mlockall，节点配置，在此通过guice依赖注入机制进行模块化加载，加载以下几个模块：

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1. ModulesBuilder modules = new ModulesBuilder();  
2. modules.add(new Version.Module(version));       //版本模块  
3. modules.add(new CacheRecyclerModule(settings)); //缓存回收模块  
4. modules.add(new PageCacheRecyclerModule(settings));//页面缓存回收模块  
5. modules.add(new CircuitBreakerModule(settings));  //分词模块  
6. modules.add(new BigArraysModule(settings));         
7. modules.add(new PluginsModule(settings, pluginsService));//插件模块  
8. modules.add(new SettingsModule(settings));        //参数配置模块  
9. modules.add(new NodeModule(this));              //节点模块  
10. modules.add(new NetworkModule());               //网络模块  
11. modules.add(new ScriptModule(settings));         //本地脚本模块，支持groovy,mustache,lucene expressions  
12. modules.add(new EnvironmentModule(environment));//环境模块  
13. modules.add(new NodeEnvironmentModule(nodeEnvironment));    //节点环境模块  
14. modules.add(new ClusterNameModule(settings));               //集群名称模块  
15. modules.add(new ThreadPoolModule(settings));                //线程池模块  
16. modules.add(new DiscoveryModule(settings));                 //自动发现模块  
17. modules.add(new ClusterModule(settings));                   //集群模块  
18. modules.add(new RestModule(settings));                      //rest服务模块  
19. modules.add(new TransportModule(settings));                 //TCP模块  
20. if (settings.getAsBoolean(HTTP_ENABLED, true)) {  
21.     modules.add(new HttpServerModule(settings));    //HTTP服务模块  
22. }  
23. modules.add(new RiversModule(settings));            //river模块     
24. modules.add(new IndicesModule(settings));           //索引模块  
25. modules.add(new SearchModule());                    //搜索模块  
26. modules.add(new ActionModule(false));               //action模块  
27. modules.add(new MonitorModule(settings));          //监控模块  
28. modules.add(new GatewayModule(settings));          //持久化模块，可用于集群状态恢复  
29. modules.add(new NodeClientModule());               //节点客户端模块  
30. modules.add(new BulkUdpModule());                  //UDP批量模块      
31. modules.add(new ShapeModule());                    //索引模板服务  
32. modules.add(new PercolatorModule());              //搜索过滤模块  
33. modules.add(new ResourceWatcherModule());         //资源监控模块  
34. modules.add(new RepositoriesModule());            //容器模块  
35. modules.add(new TribeModule());                   //部族模块，允许不同集群互相注册访问  
36.   
37. injector = modules.createInjector();  
38.   
39. client = injector.getInstance(Client.class);  

4.启动节点，节点启动时为各个模块加载实例，如下：

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1. injector.getInstance(MappingUpdatedAction.class).start();  
2. injector.getInstance(IndicesService.class).start();  
3. injector.getInstance(IndexingMemoryController.class).start();  
4. injector.getInstance(IndicesClusterStateService.class).start();  
5. injector.getInstance(IndicesTTLService.class).start();  
6. injector.getInstance(RiversManager.class).start();  
7. injector.getInstance(SnapshotsService.class).start();  
8. injector.getInstance(TransportService.class).start();  
9. injector.getInstance(ClusterService.class).start();  
10. injector.getInstance(RoutingService.class).start();  
11. injector.getInstance(SearchService.class).start();  
12. injector.getInstance(MonitorService.class).start();  
13. injector.getInstance(RestController.class).start();  
14. DiscoveryService discoService = injector.getInstance(DiscoveryService.class).start();  
15. discoService.waitForInitialState();  
16.   
17. // gateway should start after disco, so it can try and recovery from gateway on "start"  
18. injector.getInstance(GatewayService.class).start();  
19.   
20. if (settings.getAsBoolean("http.enabled", true)) {  
21.     injector.getInstance(HttpServer.class).start();  
22. }  
23. injector.getInstance(BulkUdpService.class).start();  
24. injector.getInstance(ResourceWatcherService.class).start();  
25. injector.getInstance(TribeService.class).start();  

5.启动keepalive线程，使用keepAliveLatch，初始化1，每次调用close时countDown