1. jar版本

elasticsearch-rest-high-level-client 7.12.1

2. 问题

SpringBoot项目启动后，长时间没有进行接口调用(没有执行es请求)，突然进行接口调用时(es请求)报错

2022-05-06 13:10:57.342 ERROR 30118 --- [io-10000-exec-9] c.c.e.controller.ImportDataController    : 出现未知异常:java.net.SocketTimeoutException: 30,000 milliseconds timeout on connection http-outgoing-10 [ACTIVE]
java.net.SocketTimeoutException: 30,000 milliseconds timeout on connection http-outgoing-7 [ACTIVE]

...
...

Caused by: java.net.SocketTimeoutException: 30,000 milliseconds timeout on connection http-outgoing-7 [ACTIVE]
        at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.timeout(HttpAsyncRequestExecutor.java:387)
        at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:92)
        at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:39)
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.timeout(AbstractIODispatch.java:175)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.sessionTimedOut(BaseIOReactor.java:261)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.timeoutCheck(AbstractIOReactor.java:502)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:211)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)

3. 目前的处理方式(未验证)

        RestClientBuilder rclientBuilder = RestClient.builder(new HttpHost(esConfig.getNode1Ip(), esConfig.getNode1Port(), esConfig.getNode1Scheme())
                .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
                    @Override
                    public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
                        return httpClientBuilder
                                .setKeepAliveStrategy((response, context) -> Duration.ofMinutes(5).toMillis());
                    }
                });
        restHighLevelClient = new RestHighLevelClient(rclientBuilder);

通过添加配置：

httpClientBuilder.setKeepAliveStrategy((response, context) -> Duration.ofMinutes(5).toMillis());

来保持client 每 5分钟 发送数据保持http存活

4. 参考博客

1. https://blog.csdn.net/a18100171871/article/details/112272852?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-112272852-blog-112541581.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-112272852-blog-112541581.pc_relevant_default&utm_relevant_index=2

2. https://cloud.tencent.com/developer/article/1943055