Re: [I] rocketmclient ：报错event executor terminated [rocketmq]

[via GitHub]

leizhiyuan commented on issue #8196:
URL: https://github.com/apache/rocketmq/issues/8196#issuecomment-2290744534

   这个问题一般是客户端内存oom过，然后有部分线程出现oom退出了。检查一下客户端的日志


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Re: [I] rocketmclient ：报错event executor terminated [rocketmq]

[via GitHub]

answeropensource commented on issue #8196:
URL: https://github.com/apache/rocketmq/issues/8196#issuecomment-2283002008

   根据您提供的信息，该问题似乎源于客户端在尝试与RocketMQ服务端建立连接或通信时遭遇了事件循环线程（Event 
Loop）关闭的异常。这通常意味着底层网络库（Netty）无法正确处理任务队列中的任务，可能是由于线程池已被关闭或者资源不足导致的。以下是对该问题的分析及潜在解决策略，尽管原始的知识参考未直接提供针对此特定异常的解决方案，但我们可以基于常见原因进行推理：
   
   分析原因：
资源限制或线程池配置不当：可能是因为系统资源（如CPU、内存）不足，或者Netty的线程池配置不恰当，导致线程被提前终止或拒绝新的任务提交。
   
网络问题或服务端不可达：如果RocketMQ Broker服务端不可达或响应超时，客户端在反复尝试连接时可能会触发此类异常。
   
客户端配置错误：客户端配置可能存在问题，例如心跳机制、连接超时设置不当，导致客户端无法维持与服务端的有效连接。
   
版本兼容性问题：虽然您提到了使用的RocketMQ 
broker和client版本，但理论上不同版本间可能存在兼容性问题，特别是当服务端与客户端版本跨度较大时。
   
   解决步骤：
   1. 检查系统资源与配置
   确认服务器（CentOS）的CPU、内存使用情况，确保资源充足。
   检查Netty的线程池配置是否合理，必要时调整io.netty.eventLoopThreads等参数以适应您的环境需求。
   2. 网络连通性验证
   确保网络畅通无阻，可以通过ping或telnet命令测试与RocketMQ Broker地址（127.0.0.1:9876）的连通性。
   查看Broker服务端日志，确认服务端运行正常且没有拒绝连接的记录。
   3. 客户端配置审查
   重新审视客户端配置文件（如application.properties），确认rocketmq.name-server配置正确，且与服务端实际地址匹配。
   调整客户端连接相关的配置项，比如心跳间隔、重试策略等，确保它们符合预期。
   4. 版本兼容性验证
   尽管直接的版本不兼容不太可能是该异常的直接原因，但可以考虑检查社区是否有相关版本组合下的已知问题，并考虑升级或降级客户端/服务端版本以寻求更稳定的组合。
   5. 日志深入分析
   开启客户端日志的详细模式，获取更多上下文信息，特别是连接建立、心跳维护等相关日志，有助于进一步定位问题。
   结论解释：
   
以上步骤旨在从系统资源、网络连通性、配置合理性以及软件版本兼容性等方面入手，逐一排查并解决导致客户端连接失败的潜在因素。由于原始知识参考未提供直接的解决方案，上述建议基于通用故障排查逻辑，需要您根据实际情况灵活应用。希望这些步骤能帮助您诊断并解决当前遇到的问题。
   
   参考链接：
   *专家经验：收发消息的例子
   
   
   
   如需要更深入学习了解rocketmq ，可以访问&收藏这个网站：https://rocketmq-learning.com/ 。 
提供了各类学习资料，以及专家答疑


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[I] rocketmclient ：报错event executor terminated [rocketmq]

[via GitHub]

onejimmyboy opened a new issue, #8196:
URL: https://github.com/apache/rocketmq/issues/8196

   ### Before Creating the Bug Report
   
   - [X] I found a bug, not just asking a question, which should be created in 
[GitHub Discussions](https://github.com/apache/rocketmq/discussions).
   
   - [X] I have searched the [GitHub 
Issues](https://github.com/apache/rocketmq/issues) and [GitHub 
Discussions](https://github.com/apache/rocketmq/discussions)  of this 
repository and believe that this is not a duplicate.
   
   - [X] I have confirmed that this bug belongs to the current repository, not 
other repositories of RocketMQ.
   
   
   ### Runtime platform environment
   
   centos
   
   ### RocketMQ version
   
   broker：5.1.3
   client：4.9.3
   
   ### JDK Version
   
   1.8
   
   ### Describe the Bug
   
   [2017-01-15 18:10:41,255]-[nio-worker-3-5] WARN  
io.netty.channel.AbstractChannelHandlerContext - Failed to submit an 
exceptionCaught() event.
   java.util.concurrent.RejectedExecutionException: event executor terminated
at 
io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:836)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:342)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:335)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:761)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:278)
at 
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:267)
at 
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:296)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at 
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:267)
at 
io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireExceptionCaught(CombinedChannelDuplexHandler.java:423)
at 
io.netty.channel.ChannelHandlerAdapter.exceptionCaught(ChannelHandlerAdapter.java:78)
at 
io.netty.channel.CombinedChannelDuplexHandler$1.fireExceptionCaught(CombinedChannelDuplexHandler.java:144)
at 
io.netty.channel.ChannelInboundHandlerAdapter.exceptionCaught(ChannelInboundHandlerAdapter.java:131)
at 
io.netty.channel.CombinedChannelDuplexHandler.exceptionCaught(CombinedChannelDuplexHandler.java:230)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:296)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:275)
at 
io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:267)
at 
io.netty.channel.DefaultChannelPipeline$HeadContext.exceptionCaught(DefaultChannelPipeline.java:1301)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:296)
at 
io.netty.channel.AbstractChannelHandlerContext.notifyHandlerException(AbstractChannelHandlerContext.java:861)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:193)
at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:177)
at 
io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:826)
at 
io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:752)
at 
io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasksFrom(SingleThreadEventExecutor.java:394)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:369)
at 
io.netty.util.concurrent.SingleThreadEventExecutor.confirmShutdown(SingleThreadEventExecutor.java:693)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:464)
at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:873)
at 
io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
at java.lang.Thread.run(Thread.java:745)
   
   ### Steps to Reproduce
   
   客户端在消费消息的时候
   
   ### What Did You Expect to See?
   
   消费正常
   
   ### What Did You See Instead?
   
   消费失败，客户端打印上面的错误日志
   
   ### Additional Context
   
   消费失败，客户端打印上面的错误日志


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