为对象轮询 S3 时等待来自池的连接超时

Question

我正在开发一项后端服务，该服务使用 spring aws 集成定期轮询 S3 存储桶并处理来自 S3 的轮询对象。下面是它的实现

@Configuration
@EnableIntegration
@IntegrationComponentScan
@EnableAsync
public class S3PollerConfiguration {

    //private static final Logger log = (Logger) LoggerFactory.getLogger(S3PollerConfiguration.class);

    @Value("${amazonProperties.bucketName}")
    private String bucketName;

    @Bean
    @InboundChannelAdapter(value = "s3FilesChannel", poller = @Poller(fixedDelay = "5"))
    public MessageSource<InputStream> s3InboundStreamingMessageSource() {    
        S3StreamingMessageSource messageSource = new S3StreamingMessageSource(template());
        messageSource.setRemoteDirectory(bucketName);   
        return messageSource;
    }

    @Bean
    public S3RemoteFileTemplate template() {
        return new S3RemoteFileTemplate(new S3SessionFactory(thumbnailGeneratorService.getImagesS3Client()));
    }

    @Bean
    public PollableChannel s3FilesChannel() {
        return new QueueChannel();
    }

    @Bean
    IntegrationFlow fileReadingFlow() throws IOException {
        return IntegrationFlows
                .from(s3InboundStreamingMessageSource(),
                        e -> e.poller(p -> p.fixedDelay(10, TimeUnit.SECONDS)))
                .handle(Message.class, (payload, header) -> processS3Object(payload.getHeaders(), payload.getPayload()))
                .get();
    }
}

我正在从 S3 获取有关对象上传的消息，并且我能够使用作为消息有效负载的一部分接收到的输入流来处理它。但是我在这里面临的问题是我在收到几条消息后得到 'Time out waiting for connection from pool' 异常

2019-01-06 02:19:06.156 ERROR 11322 --- [ask-scheduler-5] o.s.integration.handler.LoggingHandler   : org.springframework.messaging.MessagingException: Failed to execute on session; nested exception is com.amazonaws.SdkClientException: Unable to execute HTTP request: Timeout waiting for connection from pool
    at org.springframework.integration.file.remote.RemoteFileTemplate.execute(RemoteFileTemplate.java:445)
    at org.springframework.integration.file.remote.RemoteFileTemplate.list(RemoteFileTemplate.java:405)
    at org.springframework.integration.file.remote.AbstractRemoteFileStreamingMessageSource.listFiles(AbstractRemoteFileStreamingMessageSource.java:194)
    at org.springframework.integration.file.remote.AbstractRemoteFileStreamingMessageSource.poll(AbstractRemoteFileStreamingMessageSource.java:180)
    at org.springframework.integration.aws.inbound.S3StreamingMessageSource.poll(S3StreamingMessageSource.java:70)
    at org.springframework.integration.file.remote.AbstractRemoteFileStreamingMessageSource.doReceive(AbstractRemoteFileStreamingMessageSource.java:153)
    at org.springframework.integration.endpoint.AbstractMessageSource.receive(AbstractMessageSource.java:155)
    at org.springframework.integration.endpoint.SourcePollingChannelAdapter.receiveMessage(SourcePollingChannelAdapter.java:236)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:250)

我知道问题与未像此处所述那样关闭打开的 S3Object 有关 https://github.com/aws/aws-sdk-java/issues/1405 因此我实现了关闭作为消息有效负载的一部分接收的 S3Object 的输入流。但这并不能解决问题，我不断收到例外情况。有人可以帮我解决这个问题吗？

Answer 1

你的问题是你仍然在你的配置中混合消息注释声明和 Java DSL。

看起来在 fileReadingFlow 中您关闭了代码 processS3Object() 方法中的那些 InputStream，但是您对 [=14 生成的 InputStream 没有做任何事情=]. 你为什么把它放在拳头位置？如果您不使用它，是什么让您保留该代码？

这个 S3StreamingMessageSource 一直被轮询两次：@InboundChannelAdapter 和 IntegrationFlows.from()。

您只需从 S3StreamingMessageSource bean 定义中删除 @InboundChannelAdapter 即可。

请阅读更多参考手册以确定此类注释的原因以及使用 Java DSL 时不需要它的原因：

https://docs.spring.io/spring-integration/reference/html/configuration.html#_using_the_literal_inboundchanneladapter_literal_annotation

https://docs.spring.io/spring-integration/reference/html/java-dsl.html#java-dsl-inbound-adapters

为对象轮询 S3 时等待来自池的连接超时

Timeout waiting for connection from pool while polling S3 for Objects

java

amazon-s3

streaming

spring-integration

spring-integration-aws