When using sessions, these are (also) stored in memcache by GAE.
Unfortunately, it seems like any memcache hiccup can crash the process,
turning an otherwise fine page into a 500 page on the way out.
To me that looks like a design flaw. After all, Memcache is optional, and
its expected to be unavailable or breaking every now and then. As of 1.6
you can even provide a policy to silently ignore memcache errors inside
your application. We're using
setErrorHandler(ErrorHandlers.getConsistentLogAndContinue(Level.SEVERE))
with Objectify just fine, but it doesn't seem to have any effect on the
Session-Save process. This seems to be entirely outside our control.
These errors are really annoying some of our clients. Is there maybe some
kind of other error handler I'm missing?
Here's the stracktrace for reference:
com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error
setting single item (_ahsOH7nik8bCRTbIXblKurKQQ)
at
com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:426)
at
com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:418)
at
com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.convertResponse(MemcacheServiceApiHelper.java:60)
at
com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:112)
at
com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:105)
at
com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:57)
at
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:98)
at
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
at
com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28)
at
com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:81)
at
com.google.apphosting.runtime.jetty.MemcacheSessionStore.saveSession(MemcacheSessionStore.java:39)
at
com.google.apphosting.runtime.jetty.SessionManager$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: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)
And here's the code I tried, but which didn't help:
MemcacheService service =
MemcacheServiceFactory.getMemcacheService();
service.setErrorHandler(new
LogAndContinueErrorHandler(Level.SEVERE));
Any help would be appreciated!
Kind regards,
Per
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