问题描述

使用Java SDK连接Azure Event Hub,一直出现 java.util.concurrent.TimeoutException 异常, 消息为:java.util.concurrent.TimeoutException: Did not observe any item or terminal signal within 60000ms in 'flatMapMany' (and no fallback has been configured)。

且消息体中并没有更多有效消息。

 ERROR .e.r.OpportunityResourceEventhubReceiver []: com.cbs.message.facade.eventhub.receive.OpportunityResourceEventhubReceiver.onError.partition:NONE. Exception:{}
java.util.concurrent.TimeoutException: Did not observe any item or terminal signal within 60000ms in 'flatMapMany' (and no fallback has been configured)
at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.handleTimeout(FluxTimeout.java:294)
at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.doTimeout(FluxTimeout.java:279)
at reactor.core.publisher.FluxTimeout$TimeoutTimeoutSubscriber.onNext(FluxTimeout.java:418)
at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at reactor.core.publisher.MonoDelay$MonoDelayRunnable.propagateDelay(MonoDelay.java:270)
at reactor.core.publisher.MonoDelay$MonoDelayRunnable.run(MonoDelay.java:285)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

问题解答

如果使用Azure Event Hub官方的SDK, 可以通过设置日志输出级别为Info来查看更多详细的日志,这样就可以查看更详细的日志输出。比如:

2022-11-03 10:57:49.410  INFO  ---  [           main] c.a.m.eventhubs.EventHubClientBuilder    []: {"az.sdk.message":"Emitting a single connection.","connectionId":"MF_22f21s_6940767444216"}
2022-11-03 10:57:49.602 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Setting next AMQP channel.","entityPath":"eh01"}
2022-11-03 10:57:49.603 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Next AMQP channel received, updating 0 current subscribers","entityPath":"eh01"}
2022-11-03 10:57:49.612 INFO --- [ main] c.a.m.eventhubs.EventProcessorClient []: {"az.sdk.message":"Starting a new event processor instance.","eventProcessorId":"02690c22-21be-4b39-b976-efcf3ce3819a"}
2022-11-03 10:57:49.629 INFO --- [ main] c.a.m.eventhubs.EventHubClientBuilder []: {"az.sdk.message":"Emitting a single connection.","connectionId":"MF_93d32o_12dcdedeadcfe33"}
2022-11-03 10:57:49.630 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Setting next AMQP channel.","entityPath":"eh02"}
2022-11-03 10:57:49.698 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Next AMQP channel received, updating 0 current subscribers","entityPath":"eh02"}
2022-11-03 10:57:49.699 INFO --- [ main] c.a.m.eventhubs.EventProcessorClient []: {"az.sdk.message":"Starting a new event processor instance.","eventProcessorId":"c8d655c2-d12d-4d14-a85e-e333273293d9"}
2022-11-03 10:57:49.712 INFO --- [ main] c.a.m.eventhubs.EventHubClientBuilder []: {"az.sdk.message":"Emitting a single connection.","connectionId":"MF_0346b3_1667444269712"}
2022-11-03 10:57:49.713 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Setting next AMQP channel.","entityPath":"eh02"}
2022-11-03 10:57:49.713 INFO --- [ main] c.a.m.e.i.EventHubConnectionProcessor []: {"az.sdk.message":"Next AMQP channel received, updating 0 current subscribers","entityPath":"eh02"}
2022-11-03 10:57:49.714 INFO --- [ main] c.a.m.eventhubs.EventProcessorClient []: {"az.sdk.message":"Starting a new event processor instance.","eventProcessorId":"2fd3a905-c39c-47ff-bc8d-e4b21301eeb3"}
2022-11-03 10:57:50.127 INFO --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Starting load balancer.","ownerId":"02690c22-21be-4b39-b976-efcf3ce3819a"}
2022-11-03 10:57:50.136 INFO --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Getting partitions from Event Hubs service.","entityPath":"eh01"}
2022-11-03 10:57:51.016 INFO --- [pool-6-thread-1] c.a.c.a.i.ReactorConnection []: {"az.sdk.message":"Creating and starting connection.","connectionId":"MF_22f21s_6940767444216","hostName":"test-eventhub.servicebus.chinacloudapi.cn","port":5671}
2022-11-03 10:57:51.052 INFO --- [pool-6-thread-1] c.a.c.a.implementation.ReactorExecutor []: {"az.sdk.message":"Starting reactor.","connectionId":"MF_22f21s_6940767444216"}
2022-11-03 10:57:51.060 INFO --- [ctor-executor-1] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionInit","connectionId":"MF_22f21s_6940767444216","hostName":"test-eventhub.servicebus.chinacloudapi.cn","namespace":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.061 INFO --- [ctor-executor-1] c.a.c.a.i.handler.ReactorHandler []: {"az.sdk.message":"reactor.onReactorInit","connectionId":"MF_22f21s_6940767444216"}
2022-11-03 10:57:51.061 INFO --- [ctor-executor-1] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionLocalOpen","connectionId":"MF_22f21s_6940767444216","errorCondition":null,"errorDescription":null,"hostName":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.220 INFO --- [ctor-executor-1] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionBound","connectionId":"MF_22f21s_6940767444216","hostName":"test-eventhub.servicebus.chinacloudapi.cn","peerDetails":"test-eventhub.servicebus.chinacloudapi.cn:5671"}
2022-11-03 10:57:51.257 INFO --- [ctor-executor-1] c.a.c.a.i.handler.StrictTlsContextSpi []: SSLv2Hello was an enabled protocol. Filtering out.
2022-11-03 10:57:51.360 INFO --- [pool-8-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Starting load balancer.","ownerId":"2fd3a905-c39c-47ff-bc8d-e4b21301eeb3"}
2022-11-03 10:57:51.360 INFO --- [pool-8-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Getting partitions from Event Hubs service.","entityPath":"eh02"}
2022-11-03 10:57:51.361 INFO --- [pool-8-thread-1] c.a.c.a.i.ReactorConnection []: {"az.sdk.message":"Creating and starting connection.","connectionId":"MF_0346b3_1667444269712","hostName":"test-eventhub.servicebus.chinacloudapi.cn","port":5671}
2022-11-03 10:57:51.363 INFO --- [pool-8-thread-1] c.a.c.a.implementation.ReactorExecutor []: {"az.sdk.message":"Starting reactor.","connectionId":"MF_0346b3_1667444269712"}
2022-11-03 10:57:51.364 INFO --- [ctor-executor-2] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionInit","connectionId":"MF_0346b3_1667444269712","hostName":"test-eventhub.servicebus.chinacloudapi.cn","namespace":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.366 INFO --- [ctor-executor-2] c.a.c.a.i.handler.ReactorHandler []: {"az.sdk.message":"reactor.onReactorInit","connectionId":"MF_0346b3_1667444269712"}
2022-11-03 10:57:51.366 INFO --- [ctor-executor-2] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionLocalOpen","connectionId":"MF_0346b3_1667444269712","errorCondition":null,"errorDescription":null,"hostName":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.368 INFO --- [ctor-executor-2] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionBound","connectionId":"MF_0346b3_1667444269712","hostName":"test-eventhub.servicebus.chinacloudapi.cn","peerDetails":"test-eventhub.servicebus.chinacloudapi.cn:5671"}
2022-11-03 10:57:51.369 INFO --- [ctor-executor-2] c.a.c.a.i.handler.StrictTlsContextSpi []: SSLv2Hello was an enabled protocol. Filtering out.
2022-11-03 10:57:51.470 INFO --- [pool-7-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Starting load balancer.","ownerId":"c8d655c2-d12d-4d14-a85e-e333273293d9"}
2022-11-03 10:57:51.470 INFO --- [pool-7-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Getting partitions from Event Hubs service.","entityPath":"eh02"}
2022-11-03 10:57:51.471 INFO --- [pool-7-thread-1] c.a.c.a.i.ReactorConnection []: {"az.sdk.message":"Creating and starting connection.","connectionId":"MF_93d32o_12dcdedeadcfe33","hostName":"test-eventhub.servicebus.chinacloudapi.cn","port":5671}
2022-11-03 10:57:51.472 INFO --- [pool-7-thread-1] c.a.c.a.implementation.ReactorExecutor []: {"az.sdk.message":"Starting reactor.","connectionId":"MF_93d32o_12dcdedeadcfe33"}
2022-11-03 10:57:51.473 INFO --- [ctor-executor-3] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionInit","connectionId":"MF_93d32o_12dcdedeadcfe33","hostName":"test-eventhub.servicebus.chinacloudapi.cn","namespace":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.473 INFO --- [ctor-executor-3] c.a.c.a.i.handler.ReactorHandler []: {"az.sdk.message":"reactor.onReactorInit","connectionId":"MF_93d32o_12dcdedeadcfe33"}
2022-11-03 10:57:51.473 INFO --- [ctor-executor-3] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionLocalOpen","connectionId":"MF_93d32o_12dcdedeadcfe33","errorCondition":null,"errorDescription":null,"hostName":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:57:51.475 INFO --- [ctor-executor-3] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionBound","connectionId":"MF_93d32o_12dcdedeadcfe33","hostName":"test-eventhub.servicebus.chinacloudapi.cn","peerDetails":"test-eventhub.servicebus.chinacloudapi.cn:5671"}
2022-11-03 10:57:51.475 INFO --- [ctor-executor-3] c.a.c.a.i.handler.StrictTlsContextSpi []: SSLv2Hello was an enabled protocol. Filtering out.
2022-11-03 10:58:21.099 INFO --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: Load balancer already running
2022-11-03 10:58:21.367 INFO --- [pool-8-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: Load balancer already running
2022-11-03 10:58:21.474 INFO --- [pool-7-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: Load balancer already running
2022-11-03 10:58:51.014 WARN --- [ parallel-2] c.a.m.e.PartitionBasedLoadBalancer []: Load balancing for event processor failed. Did not observe any item or terminal signal within 60000ms in 'flatMapMany' (and no fallback has been configured)
2022-11-03 10:58:51.017 ERROR --- [ parallel-2] c.c.m.f.e.r.OpportunityEventhubReceiver []: com.cbs.message.facade.eventhub.receive.OpportunityEventhubReceiver.onError.partition:NONE. Exception:{}
java.util.concurrent.TimeoutException: Did not observe any item or terminal signal within 60000ms in 'flatMapMany' (and no fallback has been configured)
at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.handleTimeout(FluxTimeout.java:294)
at reactor.core.publisher.FluxTimeout$TimeoutMainSubscriber.doTimeout(FluxTimeout.java:279)
at reactor.core.publisher.FluxTimeout$TimeoutTimeoutSubscriber.onNext(FluxTimeout.java:418)
at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)
at reactor.core.publisher.MonoDelay$MonoDelayRunnable.propagateDelay(MonoDelay.java:270)
at reactor.core.publisher.MonoDelay$MonoDelayRunnable.run(MonoDelay.java:285)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2022-11-03 10:58:51.058 WARN --- [ctor-executor-1] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onTransportError","connectionId":"MF_93d32o_12dcdedeadcfe33","errorCondition":"amqp:connection:framing-error","errorDescription":"org.apache.qpid.proton.engine.TransportException: connection aborted","hostName":"test-eventhub.servicebus.chinacloudapi.cn"}
2022-11-03 10:58:51.062 INFO --- [ctor-executor-1] c.a.c.a.i.ReactorConnection []: {"az.sdk.message":"Disposing of ReactorConnection.","connectionId":"MF_93d32o_12dcdedeadcfe33","isTransient":false,"isInitiatedByClient":false,"shutdownMessage":"org.apache.qpid.proton.engine.TransportException: connection aborted, errorContext[NAMESPACE: test-eventhub.servicebus.chinacloudapi.cn. ERROR CONTEXT: N/A]"}
2022-11-03 10:58:51.075 INFO --- [ctor-executor-1] c.a.c.a.i.handler.ConnectionHandler []: {"az.sdk.message":"onConnectionUnbound","connectionId":"MF_93d32o_12dcdedeadcfe33","hostName":"test-eventhub.servicebus.chinacloudapi.cn","state":"CLOSED","remoteState":"UNINITIALIZED"}
2022-11-03 10:58:51.077 INFO --- [ctor-executor-1] c.a.c.a.i.ReactorConnection []: {"az.sdk.message":"Closing executor.","connectionId":"MF_93d32o_12dcdedeadcfe33"}
2022-11-03 10:58:51.099 INFO --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Starting load balancer.","ownerId":"02690c22-21be-4b39-b976-efcf3ce3819a"}
2022-11-03 10:58:51.100 INFO --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: {"az.sdk.message":"Getting partitions from Event Hubs service.","entityPath":"eh02"}
2022-11-03 10:58:51.101 ERROR --- [pool-6-thread-1] c.a.m.e.i.EventHubReactorAmqpConnection []: {"az.sdk.message":"connectionId[MF_93d32o_12dcdedeadcfe33]: Connection is disposed. Cannot get management instance","exception":"connectionId[MF_22f21s_6940767444216]: Connection is disposed. Cannot get management instance","connectionId":"MF_22f21s_6940767444216"}
2022-11-03 10:58:51.104 WARN --- [pool-6-thread-1] c.a.m.e.PartitionBasedLoadBalancer []: Load balancing for event processor failed.connectionId[MF_93d32o_12dcdedeadcfe33]: Connection is disposed. Cannot get management instance
2022-11-03 10:58:51.105 ERROR --- [pool-6-thread-1] c.c.m.f.e.r.OpportunityEventhubReceiver []: com.cbs.message.facade.eventhub.receive.OpportunityEventhubReceiver.onError.partition:NONE. Exception:{}
java.lang.IllegalStateException: connectionId[MF_22f21s_6940767444216]: Connection is disposed. Cannot get management instance
at com.azure.messaging.eventhubs.implementation.EventHubReactorAmqpConnection.getManagementNode(EventHubReactorAmqpConnection.java:90)
at com.azure.messaging.eventhubs.EventHubAsyncClient.lambda$getProperties$0(EventHubAsyncClient.java:73)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125)
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1815)
at com.azure.core.amqp.implementation.AmqpChannelProcessor.subscribe(AmqpChannelProcessor.java:267)
at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
at reactor.core.publisher.MonoZip.subscribe(MonoZip.java:128)
at reactor.core.publisher.Mono.subscribe(Mono.java:4150)
at reactor.core.publisher.MonoIgnorePublisher.subscribe(MonoIgnorePublisher.java:56)
at reactor.core.publisher.FluxRepeatPredicate$RepeatPredicateSubscriber.resubscribe(FluxRepeatPredicate.java:119)
at reactor.core.publisher.MonoRepeatPredicate.subscribeOrReturn(MonoRepeatPredicate.java:47)
at reactor.core.publisher.Flux.subscribe(Flux.java:8221)
at reactor.core.publisher.Flux.subscribeWith(Flux.java:8408)
at reactor.core.publisher.Flux.subscribe(Flux.java:8205)
at reactor.core.publisher.Flux.subscribe(Flux.java:8129)
at com.azure.messaging.eventhubs.PartitionBasedLoadBalancer.loadBalance(PartitionBasedLoadBalancer.java:154)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

根据以上的日志,可以看出:

1)在发生异常之前,有WARN日志输出,显示  Load balancing for event processor failed.

2)在连接的信息中,查看到应用连接的端口为 5671

由于一直连接不上,就应该参考官网的客户端连接问题排查访问进行排查,第一步就是检查端口 5671 是否能从执行 Java代码的主机上Ping 通。参考:https://docs.azure.cn/zh-cn/event-hubs/troubleshooting-guide#run-the-command-to-check-dropped-packets

请运行以下命令,检查是否存在任何丢弃的数据包或者无法ping通的问题:

.\psping.exe -n 25 -i 1 -q <yournamespacename>.servicebus.chinacloudapi.cn:5671 -nobanner     

在实际验证中,以上错误就是发现 客户端环境无法ping通 5671,5672端口。当在防火墙中放开这两个端口后。 连接成功!

参考资料

排查连接问题 - Azure 事件中心:https://docs.azure.cn/zh-cn/event-hubs/troubleshooting-guide#run-the-command-to-check-dropped-packets

Load balancing for event processor failed #12525https://github.com/Azure/azure-sdk-for-java/issues/12525

【Azure 事件中心】Event Hub 无法连接,出现 Did not observe any item or terminal signal within 60000ms in 'flatMapMany' 的错误消息的更多相关文章

  1. 【Azure 事件中心】在微软云中国区 (Mooncake) 上实验以Apache Kafka协议方式发送/接受Event Hubs消息 (Java版)

    问题描述 事件中心提供 Kafka 终结点,现有的基于 Kafka 的应用程序可将该终结点用作运行你自己的 Kafka 群集的替代方案. 事件中心可与许多现有 Kafka 应用程序配合使用.在Azur ...

  2. 【Azure 事件中心】Azure Event Hub 新功能尝试 -- 异地灾难恢复 (Geo-Disaster Recovery)

    问题描述 关于Event Hub(事件中心)的灾备方案,大多数就是新建另外一个备用的Event Hub,当主Event Hub出现不可用的情况时,就需要切换到备Event Hub上. 而在切换的过程中 ...

  3. 【Azure 事件中心】使用Azure AD认证方式创建Event Hub Consume Client + 自定义Event Position

    问题描述 当使用SDK连接到Azure Event Hub时,最常规的方式为使用连接字符串.这种做法参考官网文档就可成功完成代码:https://docs.azure.cn/zh-cn/event-h ...

  4. 【Azure 事件中心】 org.slf4j.Logger 收集 Event Hub SDK(Java) 输出日志并以文件形式保存

    问题描述 在使用Azure Event Hub的SDK时候,常规情况下,发现示例代码中并没有SDK内部的日志输出.因为在Java项目中,没有添加 SLF4J 依赖,已致于在启动时候有如下提示: SLF ...

  5. 【Azure 事件中心】EPH (EventProcessorHost) 消费端观察到多次Shutdown,LeaseLost的error信息,这是什么情况呢?

    问题详情 使用EPH获取Event Hub数据时,多次出现连接shutdown和LeaseLost的error  ,截取某一次的error log如: Time:2021-03-10 08:43:48 ...

  6. 【Azure 事件中心】为应用程序网关(Application Gateway with WAF) 配置诊断日志,发送到事件中心

    问题描述 在Application Gateway中,开启WAF(Web application firewall)后,现在需要把访问的日志输出到第三方分析代码中进行分析,如何来获取WAF的诊断日志呢 ...

  7. Azure Event Hub 技术研究系列2-发送事件到Event Hub

    上篇博文中,我们介绍了Azure Event Hub的一些基本概念和架构: Azure Event Hub 技术研究系列1-Event Hub入门篇 本篇文章中,我们继续深入研究,了解Azure Ev ...

  8. 【Azure 事件中心】在Service Bus Explorer工具种查看到EventHub数据在分区中的各种属性问题

    问题描述 通过Service Bus Explorer工具,查看到Event Hub的属性值,从而产生的问题及讨论: Size in Bytes:   这个是表示当前分区可以存储的最大字节数吗? La ...

  9. 【Azure 事件中心】azure-spring-cloud-stream-binder-eventhubs客户端组件问题, 实践消息非顺序可达

    问题描述 查阅了Azure的官方文档( 将事件发送到特定分区: https://docs.azure.cn/zh-cn/event-hubs/event-hubs-availability-and-c ...

随机推荐

  1. 【Java】学习路径62-枚举类型

    public enum Role { TEACHER,STUDENT,CHEF } 使用: System.out.println(r1);//输出TEACHER System.out.println( ...

  2. Yarn上运行spark-shell和spark-sql命令行

    spark-shell On Yarn spark-shell \ --master yarn-client \ --executor-memory 1G \ --num-executors 10 s ...

  3. 玩转Configmap配置应用的各种姿势

    在 k8s 中使用配置主要可以有以下几种方式来实现: 1. 向容器传递命令行参数 2. 为每个容器指定自定义的环境变量 3. 通过特殊类型的卷将配置文件挂载到容器中 在 k8s 中覆盖命令行参数 和 ...

  4. 如何干涉MySQL优化器使用hash join

    GreatSQL社区原创内容未经授权不得随意使用,转载请联系小编并注明来源. GreatSQL是MySQL的国产分支版本,使用上与MySQL一致. 前言 实验 总结 前言 数据库的优化器相当于人类的大 ...

  5. Python 第二次实验

    [1] (程序设计)三位水仙花数的计算."三位水仙花数"是指一个三位整数,其各位数字的3次方和等于该数本身.例如:ABC是一个"3位水仙花数",则:A的3次方+ ...

  6. WebDriver常见操作

    本文当个记录贴,记录WebDriver常用的一些函数(含自己封装的函数) 让WebDriver使用浏览器用户设置 1 option = webdriver.ChromeOptions() 2 opti ...

  7. golang 实现笛卡尔积(泛型)

    背景 input: [[a,b],[c],[d,e]] output: [[a,c,d],[a,c,e],[b,c,d],[b,c,e]] 思路:分治 预处理第一项:[a,b] -> [[a], ...

  8. 【gRPC】C++下使用CMakeLists快速构建项目

    在gRPC中,编写.proto文件(protocol buffer文件)来定义RPC服务的接口是第一步 先通过proto的代码生成器编译生成pb.h.pb.cc.grpc.pb.h.grpc.pb.c ...

  9. 2.69分钟完成BERT训练!新发CANN 5.0加持

    摘要:快,着实有点快. 现在,经典模型BERT只需2.69分钟.ResNet只需16秒. 啪的一下,就能完成训练! 本文分享自华为云社区<这就是华为速度:2.69分钟完成BERT训练!新发CAN ...

  10. Elasticsearch索引和查询性能调优的21条建议

    Elasticsearch部署建议 1. 选择合理的硬件配置:尽可能使用 SSD Elasticsearch 最大的瓶颈往往是磁盘读写性能,尤其是随机读取性能.使用SSD(PCI-E接口SSD卡/SA ...