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.get(FutureHelper.java:136)
        at 
com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:71)
        at 
com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:32)
        at 
com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:113)
        at 
com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:110)
        at 
com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:31)
        at 
com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:110)
        at 
com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:94)
        at 
com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(SessionManager.java:164)
        at 
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:41)
        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)

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