Experiencing similar problem: 

com.googlecode.objectify.cache.MemcacheServiceRetryProxy invoke: Error 
performing memcache operation, retrying: public abstract void 
com.google.appengine.api.memcache.MemcacheService.putAll(java.util.Map)
java.lang.reflect.InvocationTargetException
        at 
com.google.appengine.runtime.Request.process-fc7880fcc0343ab8(Request.java)
        at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:43)
        at 
com.googlecode.objectify.cache.MemcacheServiceRetryProxy.invoke(MemcacheServiceRetryProxy.java:74)
        at $Proxy6.putAll(Unknown Source)
        at 
com.googlecode.objectify.cache.EntityMemcache.empty(EntityMemcache.java:311)
        at 
com.googlecode.objectify.cache.TransactionWrapper$1.trigger(TransactionWrapper.java:100)
        at 
com.googlecode.objectify.cache.TriggerFuture.isDone(TriggerFuture.java:86)
        at 
com.googlecode.objectify.cache.TriggerFuture.get(TriggerFuture.java:101)
        at 
com.googlecode.objectify.util.FutureHelper.quietGet(FutureHelper.java:26)
        at 
com.googlecode.objectify.cache.TransactionWrapper.commit(TransactionWrapper.java:44)


On Thursday, July 26, 2012 12:00:05 PM UTC+3, Miroslav Genov wrote:
>
> Hello,
>
> It seems that there is an issue with memcache. Here is the error that I'm 
> getting: 
>
> com.google.appengine.tools.appstats.MemcacheWriter commit: Error persisting 
> request stats
> com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Set 
> failed to set 2 keys: __appstats__:015800:full, __appstats__:015800:part
>       at 
> com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$8.transform(AsyncMemcacheServiceImpl.java:550)
>       at 
> com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$8.transform(AsyncMemcacheServiceImpl.java:524)
>       at 
> com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.convertResponse(MemcacheServiceApiHelper.java:60)
>       at 
> com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:112)
>       at 
> com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:105)
>       at 
> com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:57)
>       at 
> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:98)
>       at 
> com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
>       at 
> com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28)
>       at 
> com.google.appengine.api.memcache.MemcacheServiceImpl.putAll(MemcacheServiceImpl.java:112)
>       at 
> com.google.appengine.tools.appstats.MemcacheWriter.persist(MemcacheWriter.java:268)
>       at 
> com.google.appengine.tools.appstats.MemcacheWriter.commit(MemcacheWriter.java:189)
>       at 
> com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:151)
>       at 
> org.mortbay.jetty.servlet.ServletHandler$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$RequestRunnable.run(JavaRuntime.java:477)
>       at 
> com.google.tracing.TraceContext$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)
>
>
>

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