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springboot整合es报错: availableProcessors is already set to [8], rejecting [8]

错误信息

Caused by: java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]
 at io.netty.util.NettyRuntime$AvailableProcessorsHolder.setAvailableProcessors(NettyRuntime.java:51) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
 at io.netty.util.NettyRuntime.setAvailableProcessors(NettyRuntime.java:87) ~[netty-common-4.1.23.Final.jar:4.1.23.Final]
 at org.elasticsearch.transport.netty4.Netty4Utils.setAvailableProcessors(Netty4Utils.java:85) ~[transport-netty4-client-5.6.8.jar:5.6.8]
 at org.elasticsearch.transport.netty4.Netty4Transport.<init>(Netty4Transport.java:140) ~[transport-netty4-client-5.6.8.jar:5.6.8]
 at org.elasticsearch.transport.Netty4Plugin.lambda$getTransports$0(Netty4Plugin.java:93) ~[transport-netty4-client-5.6.8.jar:5.6.8]
 at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:177) ~[elasticsearch-5.6.8.jar:5.6.8]
 at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:268) ~[elasticsearch-5.6.8.jar:5.6.8]
 at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:133) ~[transport-5.6.8.jar:5.6.8]
 at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:119) ~[transport-5.6.8.jar:5.6.8]
 at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:109) ~[transport-5.6.8.jar:5.6.8]
 at org.springframework.data.elasticsearch.client.TransportClientFactoryBean.buildClient(TransportClientFactoryBean.java:91) ~[spring-data-elasticsearch-3.0.6.RELEASE.jar:3.0.6.RELEASE]
 at org.springframework.data.elasticsearch.client.TransportClientFactoryBean.afterPropertiesSet(TransportClientFactoryBean.java:86) ~[spring-data-elasticsearch-3.0.6.RELEASE.jar:3.0.6.RELEASE]
 at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration.elasticsearchClient(ElasticsearchAutoConfiguration.java:59) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
 at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$13fe0eee.CGLIB$elasticsearchClient$0(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
 at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$13fe0eee$$FastClassBySpringCGLIB$$480cb39c.invoke(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
 at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.5.RELEASE.jar:5.0.5.RELEASE]
 at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) ~[spring-context-5.0.5.RELEASE.jar:5.0.5.RELEASE]
 at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$13fe0eee.elasticsearchClient(<generated>) ~[spring-boot-autoconfigure-2.0.1.RELEASE.jar:2.0.1.RELEASE]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171]
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_171]
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_171]
 at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171]
 at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.5.RELEASE.jar:5.0.5.RELEASE]
 ... 24 common frames omitted

原因分析

SpringBoot 2.X 的 spring-boot-starter-data-redis 默认是以 lettuce 作为连接池的，而在 lettuce ， elasticsearch transport 中都会依赖netty, 二者的netty 版本不一致，不能够兼容

解决方案

按照网上的说法是spring-boot-starter-data-elasticsearch在autoconfiguration中采用了一个参数与Netty发生冲突，建议修改成如下写法：

@Configuration
public class EsConfig {

 /**
 * 解决data-elasticsearch中与Netty之间冲突
 */
 @PostConstruct
 void init() {
 System.setProperty("es.set.netty.runtime.available.processors", "false");
 }
}

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