Same thing happened to me. It happened once and all seems fine now.

On May 14, 12:13 am, JT <[email protected]> wrote:
> After upgrading to 1.5.0, I encountered this error:
> com.google.apphosting.api.ApiProxy$CancelledException:
> The API call datastore_v3.Put() was explicitly cancelled. which I could not
> explain.
>
> However, if I hit refresh, the error will go away. Any idea why?
>
> Thanks.
>
> Full log -
>
> Uncaught exception from servlet
> com.google.apphosting.api.ApiProxy$CancelledException: The API call
> datastore_v3.Put() was explicitly cancelled.
>         at 
> com.google.apphosting.runtime.ApiProxyImpl$5.get(ApiProxyImpl.java:298)
>         at 
> com.google.apphosting.runtime.ApiProxyImpl$5.get(ApiProxyImpl.java:296)
>         at 
> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:67)
>         at 
> com.google.appengine.api.datastore.FutureHelper$CumulativeAggregateFuture.g 
> et(FutureHelper.java:136)
>         at 
> com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.ja 
> va:71)
>         at 
> com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java: 
> 32)
>         at 
> com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(Datas 
> toreServiceImpl.java:113)
>         at 
> com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(Datas 
> toreServiceImpl.java:110)
>         at 
> com.google.appengine.api.datastore.TransactionRunner.runInTransaction(Trans 
> actionRunner.java:31)
>         at 
> com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServic 
> eImpl.java:110)
>         at 
> com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServic 
> eImpl.java:94)
>         at 
> com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(Se 
> ssionManager.java:164)
>         at 
> com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionF 
> ilter.java:41)
>         at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandle 
> r.java:1157)
>         at 
> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans 
> actionCleanupFilter.java:43)
>         at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandle 
> r.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(AppVersionH 
> andlerMap.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$RequestHandler.headerComplete(HttpConnecti 
> on.java:923)
>         at 
> com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequ 
> estParser.java:76)
>         at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>         at 
> com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceReques 
> t(JettyServletEngineAdapter.java:135)
>         at 
> com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:26 0)
>         at 
> com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(Runt 
> imePb.java:9669)
>         at 
> com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439)
>         at 
> com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573)
>         at 
> com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.jav 
> a:448)
>         at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
>         at 
> com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInherited 
> ContextNoUnref(TraceContext.java:326)
>         at 
> com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInherited 
> Context(TraceContext.java:318)
>         at 
> com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java: 
> 446)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1 
> 110)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java: 
> 603)
>         at java.lang.Thread.run(Thread.java:636)

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