ES Rest High Level Client 闲置一段时间后抛出 SocketTimeoutException

Question

RestHighLevelClient用于在 spring-boot 应用程序中连接到 ES 6.4（托管在 AWS 上）。当应用闲置一段时间，请求到达时，RestHighLevelClient抛出SocketTimeoutException：

[Request processing failed; nested exception is org.springframework.data.elasticsearch.ElasticsearchException: Error while bulk for request: org.elasticsearch.action.bulk.BulkRequest@21511b6c] w
java.net.SocketTimeoutException: 5,000 milliseconds timeout on connection http-outgoing-38 [ACTIVE]
at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.timeout(HttpAsyncRequestExecutor.java:387) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:92) ~[httpasyncclient-4.1.4.jar!/:4.1.4]
at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:39) ~[httpasyncclient-4.1.4.jar!/:4.1.4]
at org.apache.http.impl.nio.reactor.AbstractIODispatch.timeout(AbstractIODispatch.java:175) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.BaseIOReactor.sessionTimedOut(BaseIOReactor.java:263) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.AbstractIOReactor.timeoutCheck(AbstractIOReactor.java:492) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:213) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591) ~[httpcore-nio-4.4.11.jar!/:4.4.11]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

RestHighLevelClient 是使用以下方法创建的：

    @Bean
    RestHighLevelClient client() {

        ClientConfiguration clientConfiguration = ClientConfiguration.builder()
                .connectedTo(elasticsearchHostAndPort)
                .build();

        return RestClients.create(clientConfiguration).rest();
    }

spring-data-elasticsearch版本3.2.0.M2使用。

任何提示/解决方法？

Answer 1

我还尝试按照此处和其他地方的建议将连接/套接字超时设置为 0。它最终没有帮助。

还有另一种解决方案/解决方法，由https://jira.spring.io/browse/DATAES-789 中的spring-data-elasticsearch 建议 。它只是在发生此类异常时执行内部重试。它并没有真正解决问题，但您的客户不会得到和错误。相反，空闲时间后的第一个请求将需要额外的 5 秒（或您配置的任何超时）。

如果您使用 Springboot-data-elasticsearch 版本 4+（使用 Springboot 2.3.0），那么您可以应用该解决方案。

我可以确认以下解决方案有效（有我上面提到的限制）：

@Configuration
public class ElasticSearchRestClientConfig extends AbstractElasticsearchConfiguration {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    @Override
    public RestHighLevelClient elasticsearchClient() {
        return restHighLevelClient;
    }

    @Bean
    @Override
    public ElasticsearchCustomConversions elasticsearchCustomConversions() {
        return new ElasticsearchCustomConversions();
    }

    @Override
    public ElasticsearchOperations elasticsearchOperations(ElasticsearchConverter elasticsearchConverter) {
        return new ElasticsearchRestTemplate(elasticsearchClient(), elasticsearchConverter) {
            @Override
            public <T> T execute(ClientCallback<T> callback) {
                int retryCount = 0;
                T t = null;
                while (retryCount <= RestClientBuilder.DEFAULT_MAX_CONN_PER_ROUTE && t == null) {
                    try {
                        t = super.execute(callback);
                    } catch (DataAccessResourceFailureException e) {
                        // retry
                        if (e.getCause() != null && (e.getCause().getCause() instanceof SocketTimeoutException) &&
                                (retryCount < RestClientBuilder.DEFAULT_MAX_CONN_PER_ROUTE)) {
                            retryCount++;
                            log.warn("Elasticsearch client - performing retry {} after caught DataAccessResourceFailureException: {}", retryCount, e.getMessage());
                        }
                        else {
                            throw e;
                        }
                    }
                }
                return t;
            }
        };
    }
 

Answer 2

套接字超时和连接超时的默认值分别RestClientBuilder.createHttpClient()设置为 30 和 10 秒。

您可以通过实现RestClientBuilder.RequestConfigCallback并调用 setRequestConfigCallback(...)您的RestHighLevelClient

我们做了类似的事情

@Override
public RequestConfig.Builder customizeRequestConfig(RequestConfig.Builder builder) {
    return builder.setSocketTimeout(socketTimeout); // try to prevent SocketTimeoutException
}