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当前位置:   首页/数据库 /一次线上mongo慢查询问题排查处理记录

一次线上mongo慢查询问题排查处理记录

发布日期：2022-07-15 19:17 | 文章来源：源码之家

一、简单介绍

mongo语句查询条件中出现null或空串，可能会导致索引失效，查询优化器无法选择正确的查询计划，出现慢查询引起服务异常

mongo查询的执行计划使用了LRU缓存，在很多种情况下会失效，导致重新选择执行计划并缓存，供后续同类查询直接使用；

服务开始时一直运行正常，当执行计划失效后，恰好出现null值的查询导致选择了错误的执行计划并缓存，后续正常的查询也会出现异常。

二、事件脉络

1、起因

用户中心收到业务方反馈，第三方登录注册出现频繁dubbo调用超时。

org.apache.dubbo.rpc.RpcException: Failed to invoke the method loginWithThird in the service weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService. Tried 1 times of the providers [10.65.5.0:11090] (1/4) from the registry node1.zk.all.platform.wtc.hwhosts.com:2181 on the consumer 10.65.1.81 using the dubbo version 2.7.3-SNAPSHOT. Last error is: loginWithThird_2 failed and fallback failed.
  at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:113)
  at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:248)
  at org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:78)
  at org.apache.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:55)
  at org.apache.dubbo.common.bytecode.proxy9.loginWithThird(proxy9.java)
  at weli.peanut.user.service.LoginService.loginAndRegister(LoginService.java:684)
  at weli.peanut.user.service.LoginService.loginByThirdPartyV2(LoginService.java:629)
  at weli.peanut.web.controller.api.UserLoginController.lambda$loginByThirdPartyV2$0(UserLoginController.java:113)
  at weli.peanut.common.controller.BaseController.resultForActionWithCat(BaseController.java:71)
  at weli.peanut.web.controller.api.UserLoginController.loginByThirdPartyV2(UserLoginController.java:113)
  at sun.reflect.GeneratedMethodAccessor2017.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
  at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
  at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
  at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
  at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
  at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
  at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
  at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
  at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
  at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
  at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
  at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
  at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1721)
  at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1679)
  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.netflix.hystrix.exception.HystrixRuntimeException: loginWithThird_2 failed and fallback failed.
  at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:818)
  at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:793)
  at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at com.netflix.hystrix.AbstractCommand$DeprecatedOnFallbackHookApplication$1.onError(AbstractCommand.java:1454)
  at com.netflix.hystrix.AbstractCommand$FallbackHookApplication$1.onError(AbstractCommand.java:1379)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at rx.observers.Subscribers$5.onError(Subscribers.java:230)
  at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
  at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:142)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at rx.internal.operators.OperatorSubscribeOn$1$1.onError(OperatorSubscribeOn.java:59)
  at rx.observers.Subscribers$5.onError(Subscribers.java:230)
  at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87)
  at rx.observers.Subscribers$5.onError(Subscribers.java:230)
  at com.netflix.hystrix.AbstractCommand$DeprecatedOnRunHookApplication$1.onError(AbstractCommand.java:1413)
  at com.netflix.hystrix.AbstractCommand$ExecutionHookApplication$1.onError(AbstractCommand.java:1344)
  at rx.observers.Subscribers$5.onError(Subscribers.java:230)
  at rx.observers.Subscribers$5.onError(Subscribers.java:230)
  at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44)
  at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41)
  at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
  at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
  at rx.Observable.unsafeSubscribe(Observable.java:10151)
  at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:56)
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:47)
  at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java:69)
  at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  ... 3 more
Caused by: java.lang.RuntimeException: org.apache.dubbo.rpc.RpcException: Invoke remote method timeout. method: loginWithThird, provider: dubbo://10.65.5.0:11090/weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService?anyhost=true&application=peanut-admin&bean.name=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService&lazy=false&loadbalance=leastactive&methods=logout,sendSms,loginWithVisitor,loginWithThird,loginWithPhone,loginWithThirdBindPhone&pid=1&register=true&register.ip=10.65.1.81&release=2.7.3-SNAPSHOT&remote.application=wormhole-api&retries=0&revision=1.1.11-SNAPSHOT&side=consumer&sticky=false&timeout=5000&timestamp=1647332146309, cause: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2022-03-15 20:33:31.937, end time: 2022-03-15 20:33:36.968, client elapsed: 0 ms, server elapsed: 5031 ms, timeout: 5000 ms, request: Request [id=690506, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=loginWithThird, parameterTypes=[class weli.wormhole.rpc.user.center.model.LoginWithThirdRequest, class weli.wormhole.rpc.user.center.model.LoginCommonParam], arguments=[LoginWithThirdRequest(accessToken=54_y3n-YsttdKOklr_X-mbjRgKAKROLDKfx3PV23zAQHmBvmT3zVliFp9mWodHSUEcKgNnJGC4AP_bAOX-2ZSSsfCHfNM5wfjbJDyiQh-sCjFQ, openId=ofrsY6xraPjv9augA9L2kUIB0-Fk, unionId=null, code=null, type=WX, nickName=null, headImgurl=null, sex=null, skipPhoneBind=1), LoginCommonParam(channel=vivo, ip=null, verName=null, platform=null, deviceId=null, imei=null, app=peanut, subApp=peanut, dfId=DUE_59hD2L9BBgukNR3Jv2DjnW00iRtU8z0eRFVFXzU5aEQyTDlCQmd1a05SM0p2MkRqblcwMGlSdFU4ejBlc2h1, idfa=null, mac=null, oaid=null, androidId=null)], attachments={path=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, version=0.0.0, timeout=5000}]], channel: /10.65.1.81:35450 -> /10.65.5.0:11090
  at suishen.esb.hystrix.dubbo.DubboHystrixCommand.run(DubboHystrixCommand.java:93)
  at suishen.esb.hystrix.dubbo.DubboHystrixCommand.run(DubboHystrixCommand.java:12)
  at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:301)
  at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:297)
  at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)
  ... 26 more
Caused by: org.apache.dubbo.rpc.RpcException: Invoke remote method timeout. method: loginWithThird, provider: dubbo://10.65.5.0:11090/weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService?anyhost=true&application=peanut-admin&bean.name=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService&check=false&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService&lazy=false&loadbalance=leastactive&methods=logout,sendSms,loginWithVisitor,loginWithThird,loginWithPhone,loginWithThirdBindPhone&pid=1&register=true&register.ip=10.65.1.81&release=2.7.3-SNAPSHOT&remote.application=wormhole-api&retries=0&revision=1.1.11-SNAPSHOT&side=consumer&sticky=false&timeout=5000&timestamp=1647332146309, cause: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2022-03-15 20:33:31.937, end time: 2022-03-15 20:33:36.968, client elapsed: 0 ms, server elapsed: 5031 ms, timeout: 5000 ms, request: Request [id=690506, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=loginWithThird, parameterTypes=[class weli.wormhole.rpc.user.center.model.LoginWithThirdRequest, class weli.wormhole.rpc.user.center.model.LoginCommonParam], arguments=[LoginWithThirdRequest(accessToken=54_y3n-YsttdKOklr_X-mbjRgKAKROLDKfx3PV23zAQHmBvmT3zVliFp9mWodHSUEcKgNnJGC4AP_bAOX-2ZSSsfCHfNM5wfjbJDyiQh-sCjFQ, openId=ofrsY6xraPjv9augA9L2kUIB0-Fk, unionId=null, code=null, type=WX, nickName=null, headImgurl=null, sex=null, skipPhoneBind=1), LoginCommonParam(channel=vivo, ip=null, verName=null, platform=null, deviceId=null, imei=null, app=peanut, subApp=peanut, dfId=DUE_59hD2L9BBgukNR3Jv2DjnW00iRtU8z0eRFVFXzU5aEQyTDlCQmd1a05SM0p2MkRqblcwMGlSdFU4ejBlc2h1, idfa=null, mac=null, oaid=null, androidId=null)], attachments={path=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, version=0.0.0, timeout=5000}]], channel: /10.65.1.81:35450 -> /10.65.5.0:11090
  at org.apache.dubbo.rpc.protocol.AsyncToSyncInvoker.invoke(AsyncToSyncInvoker.java:63)
  at org.apache.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:78)
  at com.alibaba.dubbo.rpc.Invoker$CompatibleInvoker.invoke(Invoker.java:55)
  at suishen.esb.hystrix.dubbo.DubboHystrixCommand.run(DubboHystrixCommand.java:84)
  ... 30 more
Caused by: java.util.concurrent.ExecutionException: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2022-03-15 20:33:31.937, end time: 2022-03-15 20:33:36.968, client elapsed: 0 ms, server elapsed: 5031 ms, timeout: 5000 ms, request: Request [id=690506, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=loginWithThird, parameterTypes=[class weli.wormhole.rpc.user.center.model.LoginWithThirdRequest, class weli.wormhole.rpc.user.center.model.LoginCommonParam], arguments=[LoginWithThirdRequest(accessToken=54_y3n-YsttdKOklr_X-mbjRgKAKROLDKfx3PV23zAQHmBvmT3zVliFp9mWodHSUEcKgNnJGC4AP_bAOX-2ZSSsfCHfNM5wfjbJDyiQh-sCjFQ, openId=ofrsY6xraPjv9augA9L2kUIB0-Fk, unionId=null, code=null, type=WX, nickName=null, headImgurl=null, sex=null, skipPhoneBind=1), LoginCommonParam(channel=vivo, ip=null, verName=null, platform=null, deviceId=null, imei=null, app=peanut, subApp=peanut, dfId=DUE_59hD2L9BBgukNR3Jv2DjnW00iRtU8z0eRFVFXzU5aEQyTDlCQmd1a05SM0p2MkRqblcwMGlSdFU4ejBlc2h1, idfa=null, mac=null, oaid=null, androidId=null)], attachments={path=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, version=0.0.0, timeout=5000}]], channel: /10.65.1.81:35450 -> /10.65.5.0:11090
  at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
  at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
  at org.apache.dubbo.rpc.protocol.AsyncToSyncInvoker.invoke(AsyncToSyncInvoker.java:56)
  ... 33 more
Caused by: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2022-03-15 20:33:31.937, end time: 2022-03-15 20:33:36.968, client elapsed: 0 ms, server elapsed: 5031 ms, timeout: 5000 ms, request: Request [id=690506, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=loginWithThird, parameterTypes=[class weli.wormhole.rpc.user.center.model.LoginWithThirdRequest, class weli.wormhole.rpc.user.center.model.LoginCommonParam], arguments=[LoginWithThirdRequest(accessToken=54_y3n-YsttdKOklr_X-mbjRgKAKROLDKfx3PV23zAQHmBvmT3zVliFp9mWodHSUEcKgNnJGC4AP_bAOX-2ZSSsfCHfNM5wfjbJDyiQh-sCjFQ, openId=ofrsY6xraPjv9augA9L2kUIB0-Fk, unionId=null, code=null, type=WX, nickName=null, headImgurl=null, sex=null, skipPhoneBind=1), LoginCommonParam(channel=vivo, ip=null, verName=null, platform=null, deviceId=null, imei=null, app=peanut, subApp=peanut, dfId=DUE_59hD2L9BBgukNR3Jv2DjnW00iRtU8z0eRFVFXzU5aEQyTDlCQmd1a05SM0p2MkRqblcwMGlSdFU4ejBlc2h1, idfa=null, mac=null, oaid=null, androidId=null)], attachments={path=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, interface=weli.wormhole.rpc.user.center.api.ILoginNeedPhoneService, version=0.0.0, timeout=5000}]], channel: /10.65.1.81:35450 -> /10.65.5.0:11090
  at org.apache.dubbo.remoting.exchange.support.DefaultFuture.doReceived(DefaultFuture.java:189)
  at org.apache.dubbo.remoting.exchange.support.DefaultFuture.received(DefaultFuture.java:153)
  at org.apache.dubbo.remoting.exchange.support.DefaultFuture$TimeoutCheckTask.run(DefaultFuture.java:252)
  at org.apache.dubbo.common.timer.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:648)
  at org.apache.dubbo.common.timer.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:727)
  at org.apache.dubbo.common.timer.HashedWheelTimer$Worker.run(HashedWheelTimer.java:449)
  ... 1 more

2、排查处理

a、查询用户中心cat监控，确认用户中心是否收到请求且正常响应。

当前状态：

正常状态：

对比结果：

用户中心已收到正常请求，排除客户端调用问题；

用户中心当前响应时间异常高出平常的响应时间，判断为用户中心内部业务处理出现问题。

b、查看kibana日志，发现无异常日志；

c、使用Arthas诊断工具，监控业务调用链各部分耗时情况；

定位原因为mongo查询慢导致整体业务处理超时。

d、分析mongo查询语句，查看索引情况

public User getUserByDfId(String dfId, String app) {
        Criteria criteria = Criteria.where("userBindInfo.dfId").is(dfId).and("app").is(app).and("status").is(1);
        return this.mongoTemplate.findOne(Query.query(criteria), User.class);
}

db.getCollection('wormhole_user').getIndexes();
[
    {
        "v" : 1,
        "key" : {
            "app" : 1
        },
        "name" : "app",
        "ns" : "wormhole.wormhole_user",
        "background" : true
    },
    {
        "v" : 1,
        "key" : {
            "userBindInfo.dfId" : 1
        },
        "name" : "userBindInfo.dfId",
        "ns" : "wormhole.wormhole_user",
        "background" : true
    },
    ... (其余不关注索引已删除)
]

“userBindInfo.dfId”字段存在索引，查询语句也无明显异常。

e、查看华为云后台mongo慢日志

{
    "op": "query",
    "ns": "wormhole.wormhole_user",
    "command": {
        "find": "wormhole_user",
        "filter": {
            "userBindInfo.dfId": "DUQmN3QLpLRwC8PNe1joT_9SDRrzazT4cUc5RFVRbU4zUUxwTFJ3QzhQTmUxam9UXzlTRFJyemF6VDRjVWM1c2h1",
            "app": "maybe",
            "status": 1
        },
        "ntoreturn": -1
    },
    "keysExamined": 1870039,
    "docsExamined": 1870039,
    "cursorExhausted": true,
    "numYield": 14836,
    "nreturned": 0,
    "locks": {
        "Global": {
            "acquireCou

通过慢日志发现，mongo并未使用“userBindInfo.dfId”作为索引查询条件，而是使用了“app”作为索引查询条件。

初步认为索引匹配度不够，mongo没正确使用索引。

f、新增联合索引，提高索引匹配度，查询时间恢复正常，接口恢复正常。

db.getCollection("wormhole_user").createIndex({
    "userBindInfo.dfId": 1,
    "app": 1,
    "status": 1 
}, {
    name: "idx_user_app_userBindInfo.dfId",
    background: true
});

3、问题分析

a、explain()语句分析

db.getCollection('wormhole_user').find({"userBindInfo.dfId": "DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1", "app": "maybe", "status": 1}).explain();
{
    "queryPlanner" : {
        "plannerVersion" : 1,
        "namespace" : "wormhole.wormhole_user",
        "indexFilterSet" : false,
        "parsedQuery" : {
            "$and" : [ 
                {
                    "app" : {"$eq" : "maybe"
                    }
                }, 
                {
                    "status" : {"$eq" : 1.0
                    }
                }, 
                {
                    "userBindInfo.dfId" : {"$eq" : "DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1"
                    }
                }
            ]
        },
        "winningPlan" : {
            "stage" : "FETCH",
            "filter" : {
                "$and" : [ 
                    {"app" : {
"$eq" : "maybe"}
                    }, 
                    {"status" : {
"$eq" : 1.0}
                    }
                ]
            },
            "inputStage" : {
                "stage" : "IXSCAN",
                "keyPattern" : {
                    "userBindInfo.dfId" : 1
                },
                "indexName" : "userBindInfo.dfId",
                "isMultiKey" : false,
                "multiKeyPaths" : {
                    "userBindInfo.dfId" : []
                },
                "isUnique" : false,
                "isSparse" : false,
                "isPartial" : false,
                "indexVersion" : 1,
                "direction" : "forward",
                "indexBounds" : {
                    "userBindInfo.dfId" : [ "[\"DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1\", \"DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1\"]"
                    ]
                }
            }
        },
        "rejectedPlans" : [ 
            {
                "stage" : "FETCH",
                "filter" : {
                    "$and" : [ {
"status" : {
    "$eq" : 1.0
}}, {
"userBindInfo.dfId" : {
    "$eq" : "DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1"
}}
                    ]
                },
                "inputStage" : {
                    "stage" : "IXSCAN",
                    "keyPattern" : {"app" : 1
                    },
                    "indexName" : "app",
                    "isMultiKey" : false,
                    "multiKeyPaths" : {"app" : []
                    },
                    "isUnique" : false,
                    "isSparse" : false,
                    "isPartial" : false,
                    "indexVersion" : 1,
                    "direction" : "forward",
                    "indexBounds" : {"app" : [ 
"[\"maybe\", \"maybe\"]"]
                    }
                }
            }, 
            {
                "stage" : "FETCH",
                "filter" : {
                    "$and" : [ {
"app" : {
    "$eq" : "maybe"
}}, {
"userBindInfo.dfId" : {
    "$eq" : "DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1"
}}, {
"status" : {
    "$eq" : 1.0
}}
                    ]
                },
                "inputStage" : {
                    "stage" : "AND_SORTED",
                    "inputStages" : [ {
"stage" : "IXSCAN",
"keyPattern" : {
    "app" : 1
},
"indexName" : "app",
"isMultiKey" : false,
"multiKeyPaths" : {
    "app" : []
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
    "app" : [ 
        "[\"maybe\", \"maybe\"]"
    ]
}}, {
"stage" : "IXSCAN",
"keyPattern" : {
    "userBindInfo.dfId" : 1
},
"indexName" : "userBindInfo.dfId",
"isMultiKey" : false,
"multiKeyPaths" : {
    "userBindInfo.dfId" : []
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 1,
"direction" : "forward",
"indexBounds" : {
    "userBindInfo.dfId" : [ 
        "[\"DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1\", \"DUqTmV8lQcInjzWtuyJuAntkbRi5_YZ3yHd9RFVxVG1WOGxRY0luanpXdHV5SnVBbnRrYlJpNV9ZWjN5SGQ5c2h1\"]"
    ]
}}
                    ]
                }
            }
        ]
    },
    "serverInfo" : {
        "host" : "host-192-168-10-163",
        "port" : 27017,
        "version" : "4.0.3",
        "gitVersion" : "0ead8608f9d151a199b05117bcc79ccb8d5f44a0"
    },
    "ok" : 1.0,
    "operationTime" : Timestamp(1647486920, 2),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1647486920, 2),
        "signature" : {
            "hash" : { "$binary" : "ylTAtLK6mVpNwDt7PTGwNST/9z4=", "$type" : "00" },
            "keyId" : NumberLong(7031512438860152835)
        }
    }
}
  • 发现mongo执行计划选择正确，这正好解释了服务在之前很长的一段时间内都是正常的原因；
  • mongo慢日志中的执行计划却选择错误，表明有什么原因导致了mongo执行计划的选择发生了变更。

b、文档查询

  • MongoDB 查询优化器会缓存最有效的查询计划，关联的计划缓存条目会用于具有相同查询形状的后续查询；
  • 计划缓存会出现刷新：
    • MongoDB重启；
    • 索引或者集合的删除添加更新等操作；
    • 最近最少使用 (LRU) 缓存替换机制清除最近最少访问的缓存条目。

结论：之前使用了计划缓存服务正常，到了某一时刻，计划缓存失效，MongoDB重新选择计划，此时选择了错误的计划并缓存，导致后续查询全部出现问题

c、查询首次出现的慢日志

{
    "op":"query",
    "ns":"wormhole.wormhole_user",
    "command":{
        "find":"wormhole_user",
        "filter":{
            "userBindInfo.dfId":null,
            "app":"cybercat",
            "status":1
        },
        "ntoreturn":-1
    },
    "keysExamined":872550,
    "docsExamined":872550,
    "fromMultiPlanner":true,
    "replanned":true,
    "cursorExhausted":true,
    "numYield":13785,
    "nreturned":0,
    "locks":{
        "Global":{
            "acquireCou

发现查询条件中出现了null值，本地再次分析：

db.getCollection('wormhole_user').find({"userBindInfo.dfId": null, "app": "maybe", "status": 1}).explain();
{
    "queryPlanner" : {
        "plannerVersion" : 1,
        "namespace" : "wormhole.wormhole_user",
        "indexFilterSet" : false,
        "parsedQuery" : {
            "$and" : [ 
                {
                    "app" : {"$eq" : "maybe"
                    }
                }, 
                {
                    "status" : {"$eq" : 1.0
                    }
                }, 
                {
                    "userBindInfo.dfId" : {"$eq" : null
                    }
                }
            ]
        },
        "winningPlan" : {
            "stage" : "FETCH",
            "filter" : {
                "$and" : [ 
                    {"status" : {
"$eq" : 1.0}
                    }, 
                    {"userBindInfo.dfId" : {
"$eq" : null}
                    }
                ]
            },
            "inputStage" : {
                "stage" : "IXSCAN",
                "keyPattern" : {
                    "app" : 1
                },
                "indexName" : "app",
                "isMultiKey" : false,
                "multiKeyPaths" : {
                    "app" : []
                },
                "isUnique" : false,
                "isSparse" : false,
                "isPartial" : false,
                "indexVersion" : 1,
                "direction" : "forward",
                "indexBounds" : {
                    "app" : [ "[\"maybe\", \"maybe\"]"
                    ]
                }
            }
        },
        "rejectedPlans" : [ 
            {
                "stage" : "FETCH",
                "filter" : {
                    "$and" : [ {
"userBindInfo.dfId" : {
    "$eq" : null
}}, {
"app" : {
    "$eq" : "maybe"
}}, {
"status" : {
    "$eq" : 1.0
}}
                    ]
                },
                "inputStage" : {
                    "stage" : "IXSCAN",
                    "keyPattern" : {"userBindInfo.dfId" : 1
                    },
                    "indexName" : "userBindInfo.dfId",
                    "isMultiKey" : false,
                    "multiKeyPaths" : {"userBindInfo.dfId" : []
                    },
                    "isUnique" : false,
                    "isSparse" : false,
                    "isPartial" : false,
                    "indexVersion" : 1,
                    "direction" : "forward",
                    "indexBounds" : {"userBindInfo.dfId" : [ 
"[undefined, undefined]", 
"[null, null]"]
                    }
                }
            }
        ]
    },
    "serverInfo" : {
        "host" : "host-192-168-10-163",
        "port" : 27017,
        "version" : "4.0.3",
        "gitVersion" : "0ead8608f9d151a199b05117bcc79ccb8d5f44a0"
    },
    "ok" : 1.0,
    "operationTime" : Timestamp(1647489666, 1),
    "$clusterTime" : {
        "clusterTime" : Timestamp(1647489666, 1),
        "signature" : {
            "hash" : { "$binary" : "1KJI3aoz2QbOwTKlbkNl9SmWLzw=", "$type" : "00" },
            "keyId" : NumberLong(7031512438860152835)
        }
    }
}

结果与线上表现一致

4、回顾

紧急处理时，直接创建了一个新的索引，导致了计划缓存失效，重新选择计划并缓存，所以服务恢复了正常。

三、总结

  • 避免空值的查询；
  • 尽可能的使用explain()分析各种不同的查询情况；
  • 可以使用mongo提供的PlanCache相关功能，查看计划缓存情况；
  • 可使用hint()推荐查询索引。

到此这篇关于一次线上mongo慢查询问题排查处理的文章就介绍到这了,更多相关mongo慢查询问题排查内容请搜索本站以前的文章或继续浏览下面的相关文章希望大家以后多多支持本站！

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