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阿里问题定位神器 Arthas 操作实践,定位线上BUG,超给力

产品时间:2021-10-13 00:22

简要描述:

配景公司有个渠道系统,专门对接三方渠道使用,没有什么业务逻辑,主要是转换报文和参数校验之类的事情,起着一个承上启下的作用。最近在优化接口的响应时间,优化了代码之后,可是时间还是达不到要求;有一个诡异的100ms左右的耗时问题,在接口中打印了请求处置惩罚时间后,和挪用方的响应时间另有差了100ms左右。好比法式里记载150ms,可是挪用方等候时间却为250ms左右。 下面记载下其时详细的定位gt; 渠道系统公司是云服务器,网络走的也是云的内网。...

详细介绍
本文摘要:配景公司有个渠道系统,专门对接三方渠道使用,没有什么业务逻辑,主要是转换报文和参数校验之类的事情,起着一个承上启下的作用。最近在优化接口的响应时间,优化了代码之后,可是时间还是达不到要求;有一个诡异的100ms左右的耗时问题,在接口中打印了请求处置惩罚时间后,和挪用方的响应时间另有差了100ms左右。好比法式里记载150ms,可是挪用方等候时间却为250ms左右。 下面记载下其时详细的定位gt; 渠道系统公司是云服务器,网络走的也是云的内网。

AG真人平台

配景公司有个渠道系统,专门对接三方渠道使用,没有什么业务逻辑,主要是转换报文和参数校验之类的事情,起着一个承上启下的作用。最近在优化接口的响应时间,优化了代码之后,可是时间还是达不到要求;有一个诡异的100ms左右的耗时问题,在接口中打印了请求处置惩罚时间后,和挪用方的响应时间另有差了100ms左右。好比法式里记载150ms,可是挪用方等候时间却为250ms左右。

下面记载下其时详细的定位&解决流程(其实解决很简朴,关键在于怎么定位并找到解决问题的方法)定位历程分析代码渠道系统是一个常见的spring-boot web工程,使用了集成的tomcat。分析了代码之后,发现并没有特殊的地方,没有特殊的过滤器或者拦截器,所以开端清除是业务代码问题分析挪用流程泛起这个问题之后,首先确认了下接口的挪用流程。由于是内部测试,所以挪用流程较少。Nginx -反向署理-> 渠道系统公司是云服务器,网络走的也是云的内网。

由于不明确问题的原因,所以用清除法,首先确认服务器网络是否有问题。先确认发送端到Nginx Host是否有问题:[jboss@VM_0_139_centos~]$ping10.0.0.139PING10.0.0.139(10.0.0.139)56(84)bytesofdata.64bytesfrom10.0.0.139:icmp_seq=1ttl=64time=0.029ms64bytesfrom10.0.0.139:icmp_seq=2ttl=64time=0.041ms64bytesfrom10.0.0.139:icmp_seq=3ttl=64time=0.040ms64bytesfrom10.0.0.139:icmp_seq=4ttl=64time=0.040ms从ping效果上看,发送端到Nginx主机的延迟是无问题的,接下来检察Nginx到渠道系统的网络。#由于日志是没问题的,这里直接复制上面日志了[jboss@VM_0_139_centos~]$ping10.0.0.139PING10.0.0.139(10.0.0.139)56(84)bytesofdata.64bytesfrom10.0.0.139:icmp_seq=1ttl=64time=0.029ms64bytesfrom10.0.0.139:icmp_seq=2ttl=64time=0.041ms64bytesfrom10.0.0.139:icmp_seq=3ttl=64time=0.040ms64bytesfrom10.0.0.139:icmp_seq=4ttl=64time=0.040ms从ping效果上看,Nginx到渠道系统服务器网络延迟也是没问题的既然网络看似没问题,那么可以继续清除法,砍掉Nginx,客户端直接再渠道系统的服务器上,通过回环地址(localhost)直连,制止经由网卡/dns,缩小问题规模看看能否复现(这个应用和地址是我后期模拟的,测试的是一个空接口):[jboss@VM_10_91_centostmp]$curl-w"@curl-time.txt"http://127.0.0.1:7744/sendsuccesshttp:200dns:0.001sredirect:0.000stime_connect:0.001stime_appconnect:0.000stime_pretransfer:0.001stime_starttransfer:0.073ssize_download:7bytesspeed_download:95.000B/s----------time_total:0.073s请求总耗时从curl日志上看,通过回环地址挪用一个空接口耗时也有73ms。这就奇怪了,跳过了中间所有挪用节点(包罗过滤器&拦截器之类),直接请求应用一个空接口,都有73ms的耗时,再请求一次看看:[jboss@VM_10_91_centostmp]$curl-w"@curl-time.txt"http://127.0.0.1:7744/sendsuccesshttp:200dns:0.001sredirect:0.000stime_connect:0.001stime_appconnect:0.000stime_pretransfer:0.001stime_starttransfer:0.003ssize_download:7bytesspeed_download:2611.000B/s----------time_total:0.003s更奇怪的是,第二次请求耗时就正常了,酿成了3ms。

经查阅资料,linux curl是默认开启http keep-alive的。就算不开启keep-alive,每次重新handshake,也不至于需要70ms。

经由不停分析测试发现,一连请求的话时间就会很短,每次请求只需要几毫秒,可是如果隔一段时间再请求,就会花费70ms以上。从这个现象料想,可能是某些缓存机制导致的,一连请求因为有缓存,所以速度快,时间长缓存失效后导致时间长。

那么这个问题点到底在哪一层呢?tomcat层还是spring-webmvc呢?光料想定位不了问题,还是得实际测试一下,把渠道系统的代码放到当地ide里启动测试能否复现可是导入当地Ide后,在Ide中启动后并不能复现问题,并没有70+ms的延迟问题。这下头疼了,当地无法复现,不能Debug,由于问题点不在业务代码,也不能通过加日志的方式来Debug这时候可以祭入迷器Arthas了Arthas分析问题Arthas 是Alibaba开源的Java诊断工具,深受开发者喜爱。

AG真人平台

当你遇到以下类似问题而束手无策时,Arthas可以资助你解决:这个类从哪个 jar 包加载的?为什么会报种种类相关的 Exception?我改的代码为什么没有执行到?岂非是我没 commit?分支搞错了?遇到问题无法在线上 debug,岂非只能通过加日志再重新公布吗?线上遇到某个用户的数据处置惩罚有问题,但线上同样无法 debug,线下无法重现!是否有一个全局视角来检察系统的运行状况?有什么措施可以监控到JVM的实时运行状态?上面是Arthas的官方简介,这次我只需要用他的一个小功效trace。动态盘算方法挪用路径和时间,这样我就可以定位时间在哪个地方被消耗了。

trace 方法内部挪用路径,并输出方法路径上的每个节点上耗时trace 下令能主动搜索 class-pattern/method-pattern对应的方法挪用路径,渲染和统计整个挪用链路上的所有性能开销和追踪挪用链路。有了神器,那么该追踪什么方法呢?由于我对Tomcat源码不是很熟,所以只能从spring mvc下手,先来trace一下spring mvc的入口:[arthas@24851]$traceorg.springframework.web.servlet.DispatcherServlet*PressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:44)costin508ms.`---ts=2019-09-1421:07:44;thread_name=http-nio-7744-exec-2;id=11;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@7c136917`---[2.952142ms]org.springframework.web.servlet.DispatcherServlet:buildLocaleContext()`---ts=2019-09-1421:07:44;thread_name=http-nio-7744-exec-2;id=11;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@7c136917`---[18.08903ms]org.springframework.web.servlet.DispatcherServlet:doService()+---[0.041346ms]org.apache.commons.logging.Log:isDebugEnabled()#889+---[0.022398ms]org.springframework.web.util.WebUtils:isIncludeRequest()#898+---[0.014904ms]org.springframework.web.servlet.DispatcherServlet:getWebApplicationContext()#910+---[1.071879ms]javax.servlet.http.HttpServletRequest:setAttribute()#910+---[0.020977ms]javax.servlet.http.HttpServletRequest:setAttribute()#911+---[0.017073ms]javax.servlet.http.HttpServletRequest:setAttribute()#912+---[0.218277ms]org.springframework.web.servlet.DispatcherServlet:getThemeSource()#913|`---[0.137568ms]org.springframework.web.servlet.DispatcherServlet:getThemeSource()|`---[min=0.00783ms,max=0.014251ms,total=0.022081ms,count=2]org.springframework.web.servlet.DispatcherServlet:getWebApplicationContext()#782+---[0.019363ms]javax.servlet.http.HttpServletRequest:setAttribute()#913+---[0.070694ms]org.springframework.web.servlet.FlashMapManager:retrieveAndUpdate()#916+---[0.01839ms]org.springframework.web.servlet.FlashMap:<init>()#920+---[0.016943ms]javax.servlet.http.HttpServletRequest:setAttribute()#920+---[0.015268ms]javax.servlet.http.HttpServletRequest:setAttribute()#921+---[15.050124ms]org.springframework.web.servlet.DispatcherServlet:doDispatch()#925|`---[14.943477ms]org.springframework.web.servlet.DispatcherServlet:doDispatch()|+---[0.019135ms]org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager()#953|+---[2.108373ms]org.springframework.web.servlet.DispatcherServlet:checkMultipart()#960||`---[2.004436ms]org.springframework.web.servlet.DispatcherServlet:checkMultipart()||`---[1.890845ms]org.springframework.web.multipart.MultipartResolver:isMultipart()#1117|+---[2.054361ms]org.springframework.web.servlet.DispatcherServlet:getHandler()#964||`---[1.961963ms]org.springframework.web.servlet.DispatcherServlet:getHandler()||+---[0.02051ms]java.util.List:iterator()#1183||+---[min=0.003805ms,max=0.009641ms,total=0.013446ms,count=2]java.util.Iterator:hasNext()#1183||+---[min=0.003181ms,max=0.009751ms,total=0.012932ms,count=2]java.util.Iterator:next()#1183||+---[min=0.005841ms,max=0.015308ms,total=0.021149ms,count=2]org.apache.commons.logging.Log:isTraceEnabled()#1184||`---[min=0.474739ms,max=1.19145ms,total=1.666189ms,count=2]org.springframework.web.servlet.HandlerMapping:getHandler()#1188|+---[0.013071ms]org.springframework.web.servlet.HandlerExecutionChain:getHandler()#971|+---[0.372236ms]org.springframework.web.servlet.DispatcherServlet:getHandlerAdapter()#971||`---[0.280073ms]org.springframework.web.servlet.DispatcherServlet:getHandlerAdapter()||+---[0.004804ms]java.util.List:iterator()#1224||+---[0.003668ms]java.util.Iterator:hasNext()#1224||+---[0.003038ms]java.util.Iterator:next()#1224||+---[0.006451ms]org.apache.commons.logging.Log:isTraceEnabled()#1225||`---[0.012683ms]org.springframework.web.servlet.HandlerAdapter:supports()#1228|+---[0.012848ms]javax.servlet.http.HttpServletRequest:getMethod()#974|+---[0.013132ms]java.lang.String:equals()#975|+---[0.003025ms]org.springframework.web.servlet.HandlerExecutionChain:getHandler()#977|+---[0.008095ms]org.springframework.web.servlet.HandlerAdapter:getLastModified()#977|+---[0.006596ms]org.apache.commons.logging.Log:isDebugEnabled()#978|+---[0.018024ms]org.springframework.web.context.request.ServletWebRequest:<init>()#981|+---[0.017869ms]org.springframework.web.context.request.ServletWebRequest:checkNotModified()#981|+---[0.038542ms]org.springframework.web.servlet.HandlerExecutionChain:applyPreHandle()#986|+---[0.00431ms]org.springframework.web.servlet.HandlerExecutionChain:getHandler()#991|+---[4.248493ms]org.springframework.web.servlet.HandlerAdapter:handle()#991|+---[0.014805ms]org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted()#993|+---[1.444994ms]org.springframework.web.servlet.DispatcherServlet:applyDefaultViewName()#997||`---[0.067631ms]org.springframework.web.servlet.DispatcherServlet:applyDefaultViewName()|+---[0.012027ms]org.springframework.web.servlet.HandlerExecutionChain:applyPostHandle()#998|+---[0.373997ms]org.springframework.web.servlet.DispatcherServlet:processDispatchResult()#1008||`---[0.197004ms]org.springframework.web.servlet.DispatcherServlet:processDispatchResult()||+---[0.007074ms]org.apache.commons.logging.Log:isDebugEnabled()#1075||+---[0.005467ms]org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager()#1081||+---[0.004054ms]org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted()#1081||`---[0.011988ms]org.springframework.web.servlet.HandlerExecutionChain:triggerAfterCompletion()#1087|`---[0.004015ms]org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted()#1018+---[0.005055ms]org.springframework.web.context.request.async.WebAsyncUtils:getAsyncManager()#928`---[0.003422ms]org.springframework.web.context.request.async.WebAsyncManager:isConcurrentHandlingStarted()#928[jboss@VM_10_91_centostmp]$curl-w"@curl-time.txt"http://127.0.0.1:7744/sendsuccesshttp:200dns:0.001sredirect:0.000stime_connect:0.001stime_appconnect:0.000stime_pretransfer:0.001stime_starttransfer:0.115ssize_download:7bytesspeed_download:60.000B/s----------time_total:0.115s本次挪用,挪用端时间花费115ms,可是从arthas trace上看,spring mvc只消耗了18ms,那么剩下的97ms去哪了呢?当地测试后已经可以清除spring mvc的问题了,最后也是唯一可能出问题的点就是tomcat可是本人并不熟悉tomcat中的源码,就连请求入口都不清楚,tomcat里需要trace的类都欠好找。

不外没关系,有神器Arthas,可以通过stack下令来反向查找挪用路径,以org.springframework.web.servlet.DispatcherServlet作为参数:stack 输出当前方法被挪用的挪用路径许多时候我们都知道一个方法被执行,但这个方法被执行的路径很是多,或者你基础就不知道这个方法是从那里被执行了,此时你需要的是 stack 下令。[arthas@24851]$stackorg.springframework.web.servlet.DispatcherServlet*PressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:44)costin495ms.ts=2019-09-1421:15:19;thread_name=http-nio-7744-exec-5;id=14;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@7c136917@org.springframework.web.servlet.FrameworkServlet.processRequest()atorg.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:635)atorg.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:742)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)atorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)atorg.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)atorg.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)atorg.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)atorg.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)atorg.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)atjava.lang.Thread.run(Thread.java:748)ts=2019-09-1421:15:19;thread_name=http-nio-7744-exec-5;id=14;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@7c136917@org.springframework.web.servlet.DispatcherServlet.doService()atorg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)atorg.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:635)atorg.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)atjavax.servlet.http.HttpServlet.service(HttpServlet.java:742)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)atorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)atorg.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)atorg.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)atorg.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)atorg.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)atjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)atorg.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)atjava.lang.Thread.run(Thread.java:748)从stack日志上可以很直观的看出DispatchServlet的挪用栈,那么这么长的路径,该trace哪个类呢(这里跳过spring mvc中的过滤器的trace历程,实际排查的时候也trace了一遍,但这诡异的时间消耗不是由这里过滤器发生的)?有一定履历的老司机从名字上或许也能猜出来从那里下手比力好,那就是org.apache.coyote.http11.Http11Processor.service,从名字上看,http1处置惩罚器,这可能是一个比力好的切入点。下面来trace一下:[arthas@24851]$traceorg.apache.coyote.http11.Http11ProcessorservicePressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:1)costin269ms.`---ts=2019-09-1421:22:51;thread_name=http-nio-7744-exec-8;id=17;is_daemon=true;priority=5;TCCL=org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418`---[131.650285ms]org.apache.coyote.http11.Http11Processor:service()+---[0.036851ms]org.apache.coyote.Request:getRequestProcessor()#667+---[0.009986ms]org.apache.coyote.RequestInfo:setStage()#668+---[0.008928ms]org.apache.coyote.http11.Http11Processor:setSocketWrapper()#671+---[0.013236ms]org.apache.coyote.http11.Http11InputBuffer:init()#672+---[0.00981ms]org.apache.coyote.http11.Http11OutputBuffer:init()#673+---[min=0.00213ms,max=0.007317ms,total=0.009447ms,count=2]org.apache.coyote.http11.Http11Processor:getErrorState()#683+---[min=0.002098ms,max=0.008888ms,total=0.010986ms,count=2]org.apache.coyote.ErrorState:isError()#683+---[min=0.002448ms,max=0.007149ms,total=0.009597ms,count=2]org.apache.coyote.http11.Http11Processor:isAsync()#683+---[min=0.002399ms,max=0.00852ms,total=0.010919ms,count=2]org.apache.tomcat.util.net.AbstractEndpoint:isPaused()#683+---[min=0.033587ms,max=0.11832ms,total=0.151907ms,count=2]org.apache.coyote.http11.Http11InputBuffer:parseRequestLine()#687+---[0.005384ms]org.apache.tomcat.util.net.AbstractEndpoint:isPaused()#695+---[0.007924ms]org.apache.coyote.Request:getMimeHeaders()#702+---[0.006744ms]org.apache.tomcat.util.net.AbstractEndpoint:getMaxHeaderCount()#702+---[0.012574ms]org.apache.tomcat.util.http.MimeHeaders:setLimit()#702+---[0.14319ms]org.apache.coyote.http11.Http11InputBuffer:parseHeaders()#703+---[0.003997ms]org.apache.coyote.Request:getMimeHeaders()#743+---[0.026561ms]org.apache.tomcat.util.http.MimeHeaders:values()#743+---[min=0.002869ms,max=0.01203ms,total=0.014899ms,count=2]java.util.Enumeration:hasMoreElements()#745+---[0.070114ms]java.util.Enumeration:nextElement()#746+---[0.010921ms]java.lang.String:toLowerCase()#746+---[0.008453ms]java.lang.String:contains()#746+---[0.002698ms]org.apache.coyote.http11.Http11Processor:getErrorState()#775+---[0.00307ms]org.apache.coyote.ErrorState:isError()#775+---[0.002708ms]org.apache.coyote.RequestInfo:setStage()#777+---[0.171139ms]org.apache.coyote.http11.Http11Processor:prepareRequest()#779+---[0.009349ms]org.apache.tomcat.util.net.SocketWrapperBase:decrementKeepAlive()#794+---[0.002574ms]org.apache.coyote.http11.Http11Processor:getErrorState()#800+---[0.002696ms]org.apache.coyote.ErrorState:isError()#800+---[0.002499ms]org.apache.coyote.RequestInfo:setStage()#802+---[0.005641ms]org.apache.coyote.http11.Http11Processor:getAdapter()#803+---[129.868916ms]org.apache.coyote.Adapter:service()#803+---[0.003859ms]org.apache.coyote.http11.Http11Processor:getErrorState()#809+---[0.002365ms]org.apache.coyote.ErrorState:isError()#809+---[0.003844ms]org.apache.coyote.http11.Http11Processor:isAsync()#809+---[0.002382ms]org.apache.coyote.Response:getStatus()#809+---[0.002476ms]org.apache.coyote.http11.Http11Processor:statusDropsConnection()#809+---[0.002284ms]org.apache.coyote.RequestInfo:setStage()#838+---[0.00222ms]org.apache.coyote.http11.Http11Processor:isAsync()#839+---[0.037873ms]org.apache.coyote.http11.Http11Processor:endRequest()#843+---[0.002188ms]org.apache.coyote.RequestInfo:setStage()#845+---[0.002112ms]org.apache.coyote.http11.Http11Processor:getErrorState()#849+---[0.002063ms]org.apache.coyote.ErrorState:isError()#849+---[0.002504ms]org.apache.coyote.http11.Http11Processor:isAsync()#853+---[0.009808ms]org.apache.coyote.Request:updateCounters()#854+---[0.002008ms]org.apache.coyote.http11.Http11Processor:getErrorState()#855+---[0.002192ms]org.apache.coyote.ErrorState:isIoAllowed()#855+---[0.01968ms]org.apache.coyote.http11.Http11InputBuffer:nextRequest()#856+---[0.010065ms]org.apache.coyote.http11.Http11OutputBuffer:nextRequest()#857+---[0.002576ms]org.apache.coyote.RequestInfo:setStage()#870+---[0.016599ms]org.apache.coyote.http11.Http11Processor:processSendfile()#872+---[0.008182ms]org.apache.coyote.http11.Http11InputBuffer:getParsingRequestLinePhase()#688+---[0.0075ms]org.apache.coyote.http11.Http11Processor:handleIncompleteRequestLineRead()#690+---[0.001979ms]org.apache.coyote.RequestInfo:setStage()#875+---[0.001981ms]org.apache.coyote.http11.Http11Processor:getErrorState()#877+---[0.001934ms]org.apache.coyote.ErrorState:isError()#877+---[0.001995ms]org.apache.tomcat.util.net.AbstractEndpoint:isPaused()#877+---[0.002403ms]org.apache.coyote.http11.Http11Processor:isAsync()#879`---[0.006176ms]org.apache.coyote.http11.Http11Processor:isUpgrade()#881日志里有一个129ms的耗时点(时间比没开arthas的时候更长是因为arthas自己带来的性能消耗,所以生产情况小心使用),这个就是要找的问题点。

打问题点找到了,那怎么定位是什么导致的问题呢,又如何解决呢?继续trace吧,细化到详细的代码块或者内容。trace由于性能思量,不会展示所有的挪用路径,如果挪用路径过深,只有手动深入trace,原则就是trace耗时长的谁人方法:[arthas@24851]$traceorg.apache.coyote.AdapterservicePressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:1)costin608ms.`---ts=2019-09-1421:34:33;thread_name=http-nio-7744-exec-1;id=10;is_daemon=true;priority=5;TCCL=org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418`---[81.70999ms]org.apache.catalina.connector.CoyoteAdapter:service()+---[0.032546ms]org.apache.coyote.Request:getNote()#302+---[0.007148ms]org.apache.coyote.Response:getNote()#303+---[0.007475ms]org.apache.catalina.connector.Connector:getXpoweredBy()#324+---[0.00447ms]org.apache.coyote.Request:getRequestProcessor()#331+---[0.007902ms]java.lang.ThreadLocal:get()#331+---[0.006522ms]org.apache.coyote.RequestInfo:setWorkerThreadName()#331+---[73.793798ms]org.apache.catalina.connector.CoyoteAdapter:postParseRequest()#336+---[0.001536ms]org.apache.catalina.connector.Connector:getService()#339+---[0.004469ms]org.apache.catalina.Service:getContainer()#339+---[0.007074ms]org.apache.catalina.Engine:getPipeline()#339+---[0.004334ms]org.apache.catalina.Pipeline:isAsyncSupported()#339+---[0.002466ms]org.apache.catalina.connector.Request:setAsyncSupported()#339+---[6.01E-4ms]org.apache.catalina.connector.Connector:getService()#342+---[0.001859ms]org.apache.catalina.Service:getContainer()#342+---[9.65E-4ms]org.apache.catalina.Engine:getPipeline()#342+---[0.005231ms]org.apache.catalina.Pipeline:getFirst()#342+---[7.239154ms]org.apache.catalina.Valve:invoke()#342+---[0.006904ms]org.apache.catalina.connector.Request:isAsync()#345+---[0.00509ms]org.apache.catalina.connector.Request:finishRequest()#372+---[0.051461ms]org.apache.catalina.connector.Response:finishResponse()#373+---[0.007244ms]java.util.concurrent.atomic.AtomicBoolean:<init>()#379+---[0.007314ms]org.apache.coyote.Response:action()#380+---[0.004518ms]org.apache.catalina.connector.Request:isAsyncCompleting()#382+---[0.001072ms]org.apache.catalina.connector.Request:getContext()#394+---[0.007166ms]java.lang.System:currentTimeMillis()#401+---[0.004367ms]org.apache.coyote.Request:getStartTime()#401+---[0.011483ms]org.apache.catalina.Context:logAccess()#401+---[0.0014ms]org.apache.coyote.Request:getRequestProcessor()#406+---[min=8.0E-4ms,max=9.22E-4ms,total=0.001722ms,count=2]java.lang.Integer:<init>()#406+---[0.001082ms]java.lang.reflect.Method:invoke()#406+---[0.001851ms]org.apache.coyote.RequestInfo:setWorkerThreadName()#406+---[0.035805ms]org.apache.catalina.connector.Request:recycle()#410`---[0.007849ms]org.apache.catalina.connector.Response:recycle()#411一段无聊的手动深入trace之后………………[arthas@24851]$traceorg.apache.catalina.webresources.AbstractArchiveResourceSetgetArchiveEntriesPressQorCtrl+Ctoabort.Affect(class-cnt:4,method-cnt:2)costin150ms.`---ts=2019-09-1421:36:26;thread_name=http-nio-7744-exec-3;id=12;is_daemon=true;priority=5;TCCL=org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418`---[75.743681ms]org.apache.catalina.webresources.JarWarResourceSet:getArchiveEntries()+---[0.025731ms]java.util.HashMap:<init>()#106+---[0.097729ms]org.apache.catalina.webresources.JarWarResourceSet:openJarFile()#109+---[0.091037ms]java.util.jar.JarFile:getJarEntry()#110+---[0.096325ms]java.util.jar.JarFile:getInputStream()#111+---[0.451916ms]org.apache.catalina.webresources.TomcatJarInputStream:<init>()#113+---[min=0.001175ms,max=0.001176ms,total=0.002351ms,count=2]java.lang.Integer:<init>()#114+---[0.00104ms]java.lang.reflect.Method:invoke()#114+---[0.045105ms]org.apache.catalina.webresources.TomcatJarInputStream:getNextJarEntry()#114+---[min=5.02E-4ms,max=0.008531ms,total=0.028864ms,count=31]java.util.jar.JarEntry:getName()#116+---[min=5.39E-4ms,max=0.022805ms,total=0.054647ms,count=31]java.util.HashMap:put()#116+---[min=0.004452ms,max=34.479307ms,total=74.206249ms,count=31]org.apache.catalina.webresources.TomcatJarInputStream:getNextJarEntry()#117+---[0.018358ms]org.apache.catalina.webresources.TomcatJarInputStream:getManifest()#119+---[0.006429ms]org.apache.catalina.webresources.JarWarResourceSet:setManifest()#120+---[0.010904ms]org.apache.tomcat.util.compat.JreCompat:isJre9Available()#121+---[0.003307ms]org.apache.catalina.webresources.TomcatJarInputStream:getMetaInfEntry()#133+---[5.5E-4ms]java.util.jar.JarEntry:getName()#135+---[6.42E-4ms]java.util.HashMap:put()#135+---[0.001981ms]org.apache.catalina.webresources.TomcatJarInputStream:getManifestEntry()#137+---[0.064484ms]org.apache.catalina.webresources.TomcatJarInputStream:close()#141+---[0.007961ms]org.apache.catalina.webresources.JarWarResourceSet:closeJarFile()#151`---[0.004643ms]java.io.InputStream:close()#155发现了一个值得暂停思考的点:+---[min=0.004452ms,max=34.479307ms,total=74.206249ms,count=31]org.apache.catalina.webresources.TomcatJarInputStream:getNextJarEntry()#117这行代码加载了31次,一共耗时74ms;从名字上看,应该是tomcat加载jar包时的耗时,那么是加载了31个jar包的耗时,还是加载了jar包内的某些资源31次耗时呢?TomcatJarInputStream这个类源码的注释写到:The purpose of this sub-class is to obtain references to the JarEntry objectsfor META-INF/ and META-INF/MANIFEST.MF that are otherwise swallowed by theJarInputStream implementation.或许意思也就是,获取jar包内META-INF/,META-INF/MANIFEST的资源,这是一个子类,更多的功效在父类JarInputStream里。其实看到这里或许也能猜到问题了,tomcat加载jar包内META-INF/,META-INF/MANIFEST的资源导致的耗时,至于为什么一连请求不会耗时,应该是tomcat的缓存机制(下面先容源码分析)不着急定位问题,试着通过Arthas最终定位问题细节,继续手动深入trace[arthas@24851]$traceorg.apache.catalina.webresources.TomcatJarInputStream*PressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:4)costin44ms.`---ts=2019-09-1421:37:47;thread_name=http-nio-7744-exec-5;id=14;is_daemon=true;priority=5;TCCL=org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418`---[0.234952ms]org.apache.catalina.webresources.TomcatJarInputStream:createZipEntry()+---[0.039455ms]java.util.jar.JarInputStream:createZipEntry()#43`---[0.007827ms]java.lang.String:equals()#44`---ts=2019-09-1421:37:47;thread_name=http-nio-7744-exec-5;id=14;is_daemon=true;priority=5;TCCL=org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418`---[0.050222ms]org.apache.catalina.webresources.TomcatJarInputStream:createZipEntry()+---[0.001889ms]java.util.jar.JarInputStream:createZipEntry()#43`---[0.001643ms]java.lang.String:equals()#46#这里一共31个trace日志,删减了剩下的从方法名上看,还是加载资源之类的意思。

都已经到jdk源码了,这时候来看一下TomcatJarInputStream这个类的源码:/***Createsanew<code>JarEntry</code>(<code>ZipEntry</code>)forthe*specifiedJARfileentryname.Themanifestattributesof*thespecifiedJARfileentrynamewillbecopiedtothenew*<CODE>JarEntry</CODE>.**@paramnamethenameoftheJAR/ZIPfileentry*@returnthe<code>JarEntry</code>objectjustcreated*/protectedZipEntrycreateZipEntry(Stringname){JarEntrye=newJarEntry(name);if(man!=null){e.attr=man.getAttributes(name);}returne;}这个createZipEntry有个name参数,从注释上看,是jar/zip文件名,如果能获得文件名这种关键信息,就可以直接定位问题了;还是通过Arthas,使用watch下令,动态监测方法挪用数据watch方法执行数据观察让你能利便的视察到指定方法的挪用情况。能视察到的规模为:返回值、抛出异常、入参,通过编写 OGNL 表达式举行对应变量的检察。

watch 该方法的入参[arthas@24851]$watchorg.apache.catalina.webresources.TomcatJarInputStreamcreateZipEntry"{params[0]}"PressQorCtrl+Ctoabort.Affect(class-cnt:1,method-cnt:1)costin27ms.ts=2019-09-1421:51:14;[cost=0.14547ms]result=@ArrayList[@String[META-INF/],]ts=2019-09-1421:51:14;[cost=0.048028ms]result=@ArrayList[@String[META-INF/MANIFEST.MF],]ts=2019-09-1421:51:14;[cost=0.046071ms]result=@ArrayList[@String[META-INF/resources/],]ts=2019-09-1421:51:14;[cost=0.033855ms]result=@ArrayList[@String[META-INF/resources/swagger-ui.html],]ts=2019-09-1421:51:14;[cost=0.039138ms]result=@ArrayList[@String[META-INF/resources/webjars/],]ts=2019-09-1421:51:14;[cost=0.033701ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/],]ts=2019-09-1421:51:14;[cost=0.033644ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/favicon-16x16.png],]ts=2019-09-1421:51:14;[cost=0.033976ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/springfox.css],]ts=2019-09-1421:51:14;[cost=0.032818ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/swagger-ui-standalone-preset.js.map],]ts=2019-09-1421:51:14;[cost=0.04651ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/swagger-ui.css],]ts=2019-09-1421:51:14;[cost=0.034793ms]result=@ArrayList[@String[META-INF/resources/webjars/springfox-swagger-ui/swagger-ui.js.map],这下直接看到了详细加载的资源名,这么熟悉的名字:swagger-ui,一个外洋的rest接口文档工具,又有海内开发者基于swagger-ui做了一套spring mvc的集成工具,通过注解就可以自动生成swagger-ui需要的接口界说json文件,用起来还比力利便,就是侵入性较强。删除swagger的jar包后问题,诡异的70+ms就消失了<!--pom里删除这两个引用,这两个包时海内开发者封装的,swagger-ui并没有提供javaspring-mvc的支持包,swagger只是一个浏览器端的ui+editor--><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>2.9.2</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>2.9.2</version></dependency>那么为什么swagger会导致请求耗时呢,为什么每次请求偶读会加载swagger内部的静态资源呢?其实这是tomcat-embed的一个bug吧,下面详细先容一下该BugTomcat embed Bug分析&解决源码分析历程实在太漫长,而且也不是本文的重点,所以就不先容了, 下面直接先容下分析效果顺便贴一张tomcat处置惩罚请求的焦点类图为什么每次请求会加载Jar包内的静态资源关键在于org.apache.catalina.mapper.Mapper#internalMapWrapper这个方法,该版本下处置惩罚请求的方式有问题,导致每次都校验静态资源。为什么一连请求不会泛起问题因为Tomcat对于这种静态资源的剖析是有缓存的,优先从缓存查找,缓存逾期后再重新剖析。详细参考org.apache.catalina.webresources.Cache,默认逾期时间ttl是5000ms。

为什么当地不会复现其实确切的说,是通过spring-boot打包插件后不能复现。由于启动方式的差别,tomcat使用了差别的类去处置惩罚静态资源,所以没问题如何解决升级tomcat-embed版本即可当前泛起Bug的版本为:spring-boot:2.0.2.RELEASE,内置的tomcat embed版本为8.5.31升级tomcat embed版本至8.5.40+即可解决此问题,新版本已经修复了通过替换springboot pom properties方式如果项目是maven是继续的springboot,即parent设置为springboot的,或者dependencyManagement中import spring boot包的<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.2.RELEASE</version><relativePath/><!--lookupparentfromrepository--></parent>pom中直接笼罩properties即可:<properties><tomcat.version>8.5.40</tomcat.version></properties>升级spring boot版本springboot 2.1.0.RELEASE中的tomcat embed版本已经大于8.5.31了,所以直接将springboot 版本升级至该版本及以上版本就可以解决此问题Java知音,专注于Java实用文章推送,不容错过!泉源:https://blog.csdn.net/qq826654664jx/。


本文关键词:阿里,AG真人平台,问题,定位,神器,Arthas,操作,实践,线上,BUG

本文来源:AG真人平台-www.114ktw.com

 


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