Nacos 异常 [NA] failed to update serviceName: UAT_GROUP@@****-*** com.alibaba.nacos.api.exception.NacosException: Reque
[2023-04-05 19:33:09.205] [ERROR] [com.alibaba.nacos.client.remote.worker] c.a.n.c.r.c.g.grpcClient.printIfErrorEnabled [LoggerUtils.java:99] - Server check fail, please check server **.*.*.*** ,port 9848 is available , error ={}java.util.concurrent.TimeoutException: Waited 3000 milliseconds (plus 133573 nanoseconds delay) for com.alibaba.nacos.shaded.io.grpc.stub.ClientCalls$GrpcFuture@68226c97[status=PENDING, info=[GrpcFuture{clientCall={delegate={delegate=ClientCallImpl{method=MethodDescriptor{fullMethodName=Request/request, type=UNARY, idempotent=false, safe=false, sampledToLocalTracing=true, requestMarshaller=com.alibaba.nacos.shaded.io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller@7add5b19, responseMarshaller=com.alibaba.nacos.shaded.io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller@a1c659e, schemaDescriptor=com.alibaba.nacos.api.grpc.auto.RequestGrpc$RequestMethodDescriptorSupplier@2517bae6}}}}}]] at com.alibaba.nacos.shaded.com.Google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:508) at com.alibaba.nacos.common.remote.client.grpc.GrpcClient.serverCheck(GrpcClient.java:192) at com.alibaba.nacos.common.remote.client.grpc.GrpcClient.connectToServer(GrpcClient.java:302) at com.alibaba.nacos.common.remote.client.RpcClient.reconnect(RpcClient.java:521) at com.alibaba.nacos.common.remote.client.RpcClient.lambda$start$2(RpcClient.java:369) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 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) [2023-04-05 19:33:09.206] [INFO ] [com.alibaba.nacos.client.remote.worker] c.a.n.c.r.client.printIfInfoEnabled [LoggerUtils.java:60] - [d6f69698-6284-4758-9812-163aea9a1cd6] Fail to connect server, after trying 5 times, last try server is {serverIp = '**.*.*.***', server main port = 8848}, error = unknown[2023-04-05 19:33:10.828] [ERROR] [com.alibaba.nacos.client.naming.updater.1] c.a.n.c.r.client.printIfErrorEnabled [LoggerUtils.java:99] - Send request fail, request = ServiceQueryRequest{headers={app=unknown}, requestId='null'}, retryTimes = 0, errORMessage = Client not connected, current status:UNHEALTHY[2023-04-05 19:33:10.928] [ERROR] [com.alibaba.nacos.client.naming.updater.1] c.a.n.c.r.client.printIfErrorEnabled [LoggerUtils.java:99] - Send request fail, request = ServiceQueryRequest{headers={app=unknown}, requestId='null'}, retryTimes = 1, errorMessage = Client not connected, current status:UNHEALTHY[2023-04-05 19:33:11.029] [ERROR] [com.alibaba.nacos.client.naming.updater.1] c.a.n.c.r.client.printIfErrorEnabled [LoggerUtils.java:99] - Send request fail, request = ServiceQueryRequest{headers={app=unknown}, requestId='null'}, retryTimes = 2, errorMessage = Client not connected, current status:UNHEALTHY[2023-04-05 19:33:11.029] [WARN ] [com.alibaba.nacos.client.naming.updater.1] c.a.n.client.naming.run [ServiceInfoUpdateService.java:198] - [NA] failed to update serviceName: UAT_GROUP@@dfcg-contractcom.alibaba.nacos.api.exception.NacosException: Request nacos server failed: [NA] failed to update serviceName: UAT_GROUP@@dfcg-contractcom.alibaba.nacos.api.exception.NacosException: Request nacos server failed: at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.requestToServer(NamingGrpcClientProxy.java:288) at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.queryInstancesOfService(NamingGrpcClientProxy.java:168) at com.alibaba.nacos.client.naming.remote.NaminGClientProxyDelegate.queryInstancesOfService(NamingClientProxyDelegate.java:110) at com.alibaba.nacos.client.naming.core.ServiceInfoUpdateService$UpdateTask.run(ServiceInfoUpdateService.java:185) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$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$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: com.alibaba.nacos.api.exception.NacosException: Client not connected, current status:UNHEALTHY at com.alibaba.nacos.common.remote.client.RpcClient.request(RpcClient.java:651) at com.alibaba.nacos.common.remote.client.RpcClient.request(RpcClient.java:631) at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.requestToServer(NamingGrpcClientProxy.java:278) ... 10 common frames omitted [devuser@dev-cg-platform logs]$ grep 'Thread starvation or clock leap detected' nacos.log.2023-04-05.0 2023-04-05 19:33:42,633 WARN HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=1m8s776ms847µs171ns).[devuser@dev-cg-platform logs]$ grep 'Thread starvation or clock leap detected' nacos.log.2023-04-04.0 2023-04-04 06:38:02,534 WARN HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=1m46s556ms115µs835ns).[devuser@dev-cg-platform logs]$ grep 'Thread starvation or clock leap detected' nacos.log.2023-04-03.0 2023-04-03 13:00:45,036 WARN HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=45s336ms970µs889ns).[devuser@dev-cg-platform logs]$ grep 'Thread starvation or clock leap detected' nacos.log.2023-04-02.0 2023-04-02 23:30:59,155 WARN HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=1m20s824ms191µs759ns).[devuser@dev-cg-platform logs]$ grep 'Thread starvation or clock leap detected' nacos.log.2023-04-01.02023-04-01 20:07:07,371 WARN HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=1m12s612ms153µs480ns).起初一天的异常信息没留意，然后连续查了几天发现都有一个共同点，每当nacos日志出现 Thread starvation or clock leap detected 时，子服务就会出现服务连接超时
Nacos 是一个基于服务发现和配置管理的平台，它会定期进行一些任务，如清理无效配置等，这些任务通常是由一个叫做“housekeeper”的线程执行的。当该线程因为某些原因被阻塞或者被长时间占用时，就可能会出现 Thread starvation 或者 clock leap detected 的问题，导致 Nacos 的运行出现异常。
增加 housekeeper 线程数：可以通过修改 Nacos 的配置文件（如 application.properties）来增加 housekeeper 线程数，让它们能够更快地完成任务，从而减少阻塞时间。
调整 housekeeper 的执行间隔：可以根据实际情况调整 housekeeper 的执行间隔，让它们能够更加高效地执行任务，从而减少占用时间。
检查系统资源：如果系统资源（如 CPU、内存等）不足，也会导致 housekeeper 线程被阻塞或者占用过长时间。因此，可以通过监控系统资源使用情况，及时增加资源，避免出现这种问题。
升级 Nacos 版本：Nacos 的新版本通常会修复一些已知问题，因此，如果出现 Thread starvation 或者 clock leap detected 的问题，可以尝试升级 Nacos 版本，看看是否能够解决问题。
总之，避免 Thread starvation 或者 clock leap detected 的关键是确保 housekeeper 线程能够高效地执行任务，同时保证系统资源充足
在 Nacos 中，housekeeper 是用来执行定期任务的线程，如删除过期的配置信息、清理无效的缓存等。默认情况下，Nacos 中只有一个 housekeeper 线程，如果系统中的配置信息比较多，这个线程可能会出现阻塞，导致 Nacos 的性能下降。
为了解决这个问题，可以通过修改 Nacos 的配置文件（如 application.properties）来配置 housekeeper 线程的数量和执行时间间隔。具体操作如下：
配置 housekeeper 线程数量：可以通过配置项 nacos.core.thread.count 来指定 housekeeper 线程的数量。例如，将其设置为 10，则会启动 10 个 housekeeper 线程来执行定期任务。默认情况下，该值为 1，也就是只有一个 housekeeper 线程。
# 设置 housekeeper 线程数量nacos.core.thread.count=10可以通过配置项 nacos.core.task.maxTime 来指定 housekeeper 执行任务的时间间隔。例如，将其设置为 30 分钟，则每隔 30 分钟会执行一次定期任务。默认情况下，该值为 15 分钟。
# 设置 housekeeper 执行时间间隔nacos.core.task.maxTime=30mnacos.cmdb.dumpTaskTimeInterval：dump 定时任务执行时间间隔，用于打印出定时任务执行的时间情况。nacos.core.task.check.maxDelta：检查系统时间与 NTP 时间的最大差距，用于检测系统时间是否被篡改。nacos.core.task.delete.task.interval：删除任务执行的时间间隔。总之，配置 housekeeper 可以帮助优化 Nacos 的性能和稳定性，避免出现线程阻塞和性能下降等问题。
# 转储外部CMDB的间隔(以秒为单位): nacos.cmdb.dumpTaskInterval=3600# 设置检查系统时间与 NTP 时间的最大差距nacos.core.task.check.maxDelta=600000# 设置定期清理过期数据的时间间隔nacos.core.task.delete.task.interval=2h来源地址：https://blog.csdn.net/qq_40694145/article/details/129988327
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本文标题: 连接nacos异常[NA] failed to update serviceName: UAT_GROUP@@**-** NacosException: Request Exception
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