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处理AppEngine Memcache超时

[英]Handling AppEngine Memcache Timeouts

 原文  2012-04-26 18:10:15  1   1    java/ google-app-engine/ memcached

问题描述

com.google.apphosting.api.ApiProxy$ApiDeadlineExceededException: The API call memcache.Get() took too long to respond and was cancelled.

What is the best way of handling Memcache errors like this? 这样处理Memcache错误的最佳方法是什么？ I assumed that memcache calls (as opposed to datastore calls) would just return null if they fail for some reason, since null results are always possible when cached items are dropped from the cache. 我假设memcache调用（而不是数据存储区调用）如果由于某种原因失败则会返回null，因为当从缓存中删除缓存项时，总是可以得到null结果。

I'm considering wrapping the memcache calls with my own methods to catch the exceptions and return null. 我正在考虑用我自己的方法包装memcache调用来捕获异常并返回null。 Any better ideas? 有更好的想法吗？

Edit: I now see that you can set error handlers. 编辑：我现在看到你可以设置错误处理程序。 The LogAndContinueErrorHandler is supposed to be the default but it's unclear exactly what's set/being used. LogAndContinueErrorHandler应该是默认值，但不清楚究竟是什么设置/正在使用。 This would seem to be way to go though. 这似乎是可行的方式。

Edit: Here's the full stack trace: 编辑：这是完整的堆栈跟踪： 

com.google.apphosting.api.ApiProxy$ApiDeadlineExceededException: The API call memcache.Get() took too long to respond and was cancelled.
    at com.google.apphosting.runtime.ApiProxyImpl$3.createDeadlineException(ApiProxyImpl.java:318)
    at com.google.appengine.tools.development.TimedFuture.get(TimedFuture.java:44)
    at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:63)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:51)
    at mikelike.account.Account.getPrivateBoardsFromCache(Account.java:1110)
    at org.apache.jsp.inc.dialogs.pin_005fdialog_jsp._jspService(pin_005fdialog_jsp.java:77)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.servlet.Dispatcher.include(Dispatcher.java:192)
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
    at org.apache.jsp.inc.header_jsp._jspService(header_jsp.java:145)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.servlet.Dispatcher.include(Dispatcher.java:192)
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:107)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
    at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
    at com.google.apphosting.runtime.jetty.ResourceFileServlet.serveWelcomeFileAsForward(ResourceFileServlet.java:342)
    at com.google.apphosting.runtime.jetty.ResourceFileServlet.maybeServeWelcomeFile(ResourceFileServlet.java:281)
    at com.google.apphosting.runtime.jetty.ResourceFileServlet.doGet(ResourceFileServlet.java:142)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at mikelike.common.MikeLikeServletFilter.doFilter(MikeLikeServletFilter.java:191)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:679)

Edit: Here are the headers: 编辑：以下是标题： 

Host: www.mikelike.com
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Referer: http://www.mikelike.com/pin/PiAILvNi4yA3c/no-description
Accept-Language: ja,en-US;q=0.8,en;q=0.6
Accept-Charset: Shift_JIS,utf-8;q=0.7,*;q=0.3
Cookie: bookmarklet=mikelike; __utma=144575401.2134744684.1335291737.1336151354.1336236818.8; __utmb=144575401.263.10.1336236818; __utmc=144575401; __utmz=144575401.1336236818.8.7.utmcsr=pinterest.com|utmccn=(referral)|utmcmd=referral|utmcct=/nagakubo/watch-later/; fbm_247980821960554=base_domain=.mikelike.com; fbsr_247980821960554=bCuJN2JJUzK9RpAzxnurnPTaWLLYIk3MAnBrjDn0_WE.eyJhbGdvcml0aG0iOiJITUFDLVNIQTI1NiIsImNvZGUiOiIyLkFRQ1JJeldBYWUyY1FHUGcuMzYwMC4xMzM2MjQ4MDAwLjEtMTI1ODY2OTgzN3xLWEd4MVVNYS12T0k2RGxWaW90NVppRndWZ1kiLCJpc3N1ZWRfYXQiOjEzMzYyNDQxODMsInVzZXJfaWQiOiIxMjU4NjY5ODM3In0
X-Zoo: app-id=mikelikecom,domain=mikelike.com,host=www.mikelike.com
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.168 Safari/535.19
X-Google-Apps-Metadata: domain=mikelike.com,host=www.mikelike.com
X-AppEngine-Country: JP
X-AppEngine-Region: 13
X-AppEngine-City: fuchu
X-AppEngine-CityLatLong: 35.668973,139.477661
X-AppEngine-Default-Namespace: mikelike.com

Edit: Here's the full log entry. 编辑：这是完整的日志条目。 

2012-05-12 18:37:24.317 /ml/scripts/set_bookmarklet_cookie/?pin_service=mikelike&_=1336873018270 500 25355ms 2kb Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.5 Safari/534.55.3

99.226.111.36 - - [12/May/2012:18:37:24 -0700] "GET /ml/scripts/set_bookmarklet_cookie/?pin_service=mikelike&_=1336873018270 HTTP/1.1" 500 2793 "http://pinterest.com/pin/126593439495821330/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.5 Safari/534.55.3" "www.mikelike.com" ms=25356 cpu_ms=19232 api_cpu_ms=0 cpm_usd=0.635415 instance=00c61b117c5f07e0509d55c89da88f028311b8

W 2012-05-12 18:37:23.996

/ml/scripts/set_bookmarklet_cookie/
com.google.apphosting.api.ApiProxy$ApiDeadlineExceededException: The API call memcache.Get() took too long to respond and was cancelled.
    at com.google.apphosting.runtime.ApiProxyImpl$3.createDeadlineException(ApiProxyImpl.java:318)
    at com.google.appengine.tools.development.TimedFuture.get(TimedFuture.java:44)
    at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:63)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:51)
    at mikelike.account.Account.getAccountFromCache(Account.java:1053)
    at mikelike.common.MikeLikeServletFilter.getUserAccount(MikeLikeServletFilter.java:209)
    at mikelike.common.MikeLikeServletFilter.doFilter(MikeLikeServletFilter.java:165)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:679)

1 个解决方案

解决方案1
 0  2012-05-04 08:34:25

Is this error occuring on dev server ? 这是在开发服务器上发生错误吗？ If so, keep in mind that memcache memory use will grow over time (if you don't explicitly clear items..) as internal memcache api is not properly managed on dev server. 如果是这样，请记住，memcache内存使用会随着时间的推移而增长（如果您没有明确清除项目..）因为内部memcache api未在dev服务器上正确管理。

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