谷歌应用引擎HardDeadlineExceededError

Question

我在谷歌应用引擎上托管我的应用程序.我的应用程序应该做的是每两分钟连接一个网站,解析它并使用C2DM将必要的信息发送到我的设备.我首先测试了我的应用程序,看它是否有效.它工作正常.但为了每两分钟检查一次网站,我将所需的方法放在while循环中,然后将Thread.sleep(120000)放入while循环中.它wokred一段时间,但现在我得到这样的:从servlet的com.google.apphosting.runtime.HardDeadlineExceededError未捕获的异常:该请求(f6b9f0b8e1ec6f23)在2011/06/09开始10:24:22.514 UTC,并在2011年仍然在执行/ 06/09 10:24:52.824 UTC.

所以在两分钟之前,每件事都没问题.

这是整个错误消息:

Uncaught exception from servlet
com.google.apphosting.runtime.HardDeadlineExceededError: This request (f6b9f0b8e1ec6f23) started at 2011/06/09 10:24:22.514 UTC and was still executing at 2011/06/09 10:24:52.824 UTC.

at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:408)
at java.lang.StringBuilder.append(StringBuilder.java:136)
at java.lang.StringBuilder.<init>(StringBuilder.java:110)
at tripplannerServer.ParseVerstoring.parsePlanned(ParseVerstoring.java:50)
at tripplannerServer.SendMessage2.geplandeVerstoring(SendMessage2.java:257)
at tripplannerServer.TripplannerServerServlet.doGet(TripplannerServerServlet.java:152)
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$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
at org.mortbay.jetty.servlet.ServletHandler$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:238)
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$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:260)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(RuntimePb.java:9669)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439)
at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)

不知道怎么解决这个问题？或者使用Thread.sleep()的想法不好？如果不是,我如何让应用程序每两分钟检查一次网站？

先感谢您.

Answer 1

您不应该Thread.sleep在App Engine前端,任务队列或cron请求中使用.相反,每两分钟安排一次cron作业,或者使用适当的ETA链接任务队列任务.