Java访问Elasticsearch报错Request cannot be executed; I/O reactor status: STOPPED

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简介

使用ES过程中遇到一个Request cannot be executed; I/O reactor status: STOPPED 的异常，大概意思是和server端的连接异常终止了。开始以为是引用的版本不对，或者自己使用问题，后来发现就是因为OOM导致程序宕机，进而引发连接终止。

环境

功能

SpringBoot 的程序通过 SpringDataElasticsearch 访问ES-server 获取数据。

ES-SERVER

版本：7.15.2

ES-CLIENT

ES-CLIENT 就是 SpringBoot 程序，核心pom依赖：

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-elasticsearch</artifactId> <version>2.5.3</version> </dependency>

问题

部署到测试环境之后，用户量大了之后接口报错，报错信息为：

Request cannot be executed; I/O reactor status: STOPPED

后端程序处于假死状态，访问其他接口一直转圈，无法响应内容
重启程序之后一切正常，用户量大了之后又有此问题
详细报错日志为：

2021-12-31/19:26:31.748||||^_^|[pool-4-thread-1] ERROR o.a.http.impl.nio.client.InternalHttpAsyncClient 66 - I/O reactor terminated abnormally org.apache.http.nio.reactor.IOReactorException: I/O dispatch worker terminated abnormally at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:359) at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221) at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: java.lang.OutOfMemoryError: Java heap space 2021-12-31/19:26:32.783||||^_^|[http-nio-8092-exec-3] ERROR com.nghsmart.datacenter.handler.ExceptionHandler 67 - handleRuntimeException: java.lang.RuntimeException: Request cannot be executed; I/O reactor status: STOPPED at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:888) at org.elasticsearch.client.RestClient.performRequest(RestClient.java:283) at org.elasticsearch.client.RestClient.performRequest(RestClient.java:270) at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1654) at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1624) at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1594) at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1110) at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.lambda$search$11(ElasticsearchRestTemplate.java:296) at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.execute(ElasticsearchRestTemplate.java:383) at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.search(ElasticsearchRestTemplate.java:296) at org.springframework.data.elasticsearch.core.AbstractElasticsearchTemplate.search(AbstractElasticsearchTemplate.java:513) at com.nghsmart.datacenter.domain.area.service.impl.AreaDashboradServiceImpl.getRotationStatisticsInfo(AreaDashboradServiceImpl.java:166) at com.nghsmart.datacenter.domain.area.controller.AreaDashboradController.getRotationStatisticsInfo(AreaDashboradController.java:76) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1064) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at com.nghsmart.commonauthentication.filter.JwtAuthenticationTokenFilter.doFilterInternal(JwtAuthenticationTokenFilter.java:52) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: java.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED at org.apache.http.util.Asserts.check(Asserts.java:46) at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.ensureRunning(CloseableHttpAsyncClientBase.java:90) at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:123) at org.elasticsearch.client.RestClient.performRequest(RestClient.java:279) ... 69 common frames omitted

测试环境用户量一大就报，本地IDEA中一次也没有报这个问题
使用JMETER设置50个线程并发访问可以稳定复现此问题

原因

程序接口中将一块很大的数据存进JAVA集合中引发了oom，oom异常导致程序宕机，处于假死状态，进而导致 ES-CLIENT 和 ES-SERVER 端的 http 连接异常终止，然后org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.ensureRunning 方法报异常。

ensureRunning:

protected void ensureRunning() { final Status currentStatus = this.status.get(); Asserts.check(currentStatus == Status.ACTIVE, "Request cannot be executed; " + "I/O reactor status: %s", currentStatus); }

check:

public static void check(final boolean expression, final String message, final Object arg) { if (!expression) { throw new IllegalStateException(String.format(message, arg)); } }

SpringDataElasticsearch 和ES-SERVER 是长链接，只要报了OOM，当前和 ES-SERVER 的连接线程都将报异常，也就是说，虽然OOM只报了一次，但是可能有多个线程都在 Asserts.check 方法中报异常
其实不仅仅是和ES-SERVER 的连接异常关闭，观察大量日志后发现和nacos 的连接也有问题：

2022-01-04 15:59:07.366 [com.alibaba.nacos.client.remote.worker] INFO com.alibaba.nacos.common.remote.client.printIfInfoEnabled:60 - [117be10e-119f-4253-a348-71c95a8978a1]Server healthy check fail,currentConnection=1641282430796_192.168.1.90_43108 2022-01-04 15:59:07.367 [com.alibaba.nacos.client.remote.worker] INFO com.alibaba.nacos.common.remote.client.printIfInfoEnabled:60 - [117be10e-119f-4253-a348-71c95a8978a1] try to re connect to a new server ,server is not appointed,will choose a random server.

测试环境运行SpringBoot内存配置为：-Xms256m -Xmx512m，使用 java -jar 命令启动。测试环境能复现，本地idea无法复现的原因是内存配置不同导致的，本地idea内存给的2g。编辑 run/debug configuration ，设置 VM options 和测试环境相同，使用jemter压测本地idea中跑的程序，也能复现此问题

解决办法

优化接口，解决OOM问题
增大测试环境内存配置

解决过程

HttpClient问题

这个思路并没有解决我的问题，但是解决问题的过程中花了大量时间研究。其实应该仔细阅读报错log的上下文和接口代码上下文，一开始没有留意到oom的异常

大概意思是说低版本 httpClient 有这个问题，高版本就没有这个问题，是apache-httpclient 导致的。具体是因为捕获到线程异常之后http连接就主动终止了，解决思路是升级版本或者是重写处理器，遇到异常之后不终止连接。

升级httpclient相关pom依赖：

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-elasticsearch</artifactId>  <exclusions>             <exclusion> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-client</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-client</artifactId> <version>7.15.2</version> <exclusions> <exclusion> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </exclusion> <exclusion> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcore</artifactId> </exclusion> <exclusion> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcore-nio</artifactId> </exclusion> </exclusions> </dependency>   <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.13</version> </dependency><dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcore-nio</artifactId> <version>4.4.14</version> </dependency><dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpcore</artifactId> <version>4.4.14</version> </dependency>

重写ElasticsearchRestTemplate：

import com.alibaba.fastjson.JSON; import lombok.extern.slf4j.Slf4j; import org.apache.http.Header; import org.apache.http.HttpHost; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.client.CredentialsProvider; import org.apache.http.impl.client.BasicCredentialsProvider; import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy; import org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager; import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor; import org.apache.http.message.BasicHeader; import org.apache.http.nio.reactor.IOReactorException; import org.apache.http.nio.reactor.IOReactorExceptionHandler; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestClientBuilder; import org.elasticsearch.client.RestHighLevelClient; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate; import java.io.IOException; import java.util.ArrayList; import java.util.List; @Slf4j @Configuration public class EsClientConfig { @Value("${es.host}") private String host; @Value("${es.port}") private Integer port; @Bean public ElasticsearchRestTemplate initElasticsearchRestTemplate() { RestClientBuilder builder = RestClient.builder(new HttpHost(host, port)) .setRequestConfigCallback( config -> config.setConnectTimeout(180000) .setConnectionRequestTimeout(180000) .setSocketTimeout(180000)) .setHttpClientConfigCallback( httpClientBuilder -> { httpClientBuilder.setMaxConnTotal(100); httpClientBuilder.setMaxConnPerRoute(50); List<Header> headers = new ArrayList<>(2); headers.add(new BasicHeader("Connection", "keep-alive")); headers.add(new BasicHeader("Keep-Alive", "720")); httpClientBuilder.setDefaultHeaders(headers); httpClientBuilder.setKeepAliveStrategy(DefaultConnectionKeepAliveStrategy.INSTANCE); try { DefaultConnectingIOReactor ioReactor = new DefaultConnectingIOReactor(); ioReactor.setExceptionHandler(new IOReactorExceptionHandler() { @Override public boolean handle(IOException e) { log.debug("System may be unstable: IOReactor encountered a checked exception : " + e.getMessage()); log.debug("start setHttpClientConfigCallback handle IOException e printStackTrace"); e.printStackTrace(); log.debug("end setHttpClientConfigCallback handle IOException e printStackTrace"); // Return true to note this exception as handled, it will not be re-thrown return true; } @Override public boolean handle(RuntimeException e) { log.debug("System may be unstable: IOReactor encountered a runtime exception : " + e.getMessage() + ",e is {}", e); log.debug("start setHttpClientConfigCallback handle RuntimeException e printStackTrace "); e.printStackTrace(); log.debug("end setHttpClientConfigCallback handle RuntimeException e printStackTrace "); // Return true to note this exception as handled, it will not be re-thrown return true; } }); httpClientBuilder.setConnectionManager(new PoolingNHttpClientConnectionManager(ioReactor)); } catch (IOReactorException e) { throw new RuntimeException(e); } return httpClientBuilder; } ); ElasticsearchRestTemplate elasticsearchRestTemplate = new ElasticsearchRestTemplate(new RestHighLevelClient(builder)); return elasticsearchRestTemplate; } }