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com.google.appengine.api.datastore.DatastoreTimeoutException: The datastore operation timed out, or the data was temporarily unavailable.	at com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java:64)	at com.google.appengine.api.datastore.DatastoreApiHelper$1.convertException(DatastoreApiHelper.java:129)	at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:97)	at com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:76)	at com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:36)	at com.google.appengine.api.datastore.BaseQueryResultsSource.loadMoreEntities(BaseQueryResultsSource.java:197)	at com.google.appengine.api.datastore.BaseQueryResultsSource.loadMoreEntities(BaseQueryResultsSource.java:171)	at com.google.appengine.api.datastore.QueryResultIteratorImpl.ensureLoaded(QueryResultIteratorImpl.java:148)	at com.google.appengine.api.datastore.QueryResultIteratorImpl.hasNext(QueryResultIteratorImpl.java:64)	at com.google.appengine.api.datastore.PreparedMultiQuery$FilteredMultiQueryIterator.computeNext(PreparedMultiQuery.java:249)	at com.google.appengine.api.datastore.PreparedMultiQuery$FilteredMultiQueryIterator.computeNext(PreparedMultiQuery.java:185)	at com.google.appengine.api.datastore.AbstractIterator.tryToComputeNext(AbstractIterator.java:46)	at com.google.appengine.api.datastore.AbstractIterator.hasNext(AbstractIterator.java:41)	at com.google.appengine.api.datastore.QueryResultIteratorDelegator.hasNext(QueryResultIteratorDelegator.java:38)	at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator$1.get(RuntimeExceptionWrappingIterator.java:50)	at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator$1.get(RuntimeExceptionWrappingIterator.java:46)	at org.datanucleus.store.appengine.query.QueryExceptionWrappers$1.get(QueryExceptionWrappers.java:51)	at org.datanucleus.store.appengine.query.QueryExceptionWrappers$2.get(QueryExceptionWrappers.java:86)	at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator.hasNext(RuntimeExceptionWrappingIterator.java:105)	at org.datanucleus.store.appengine.query.LazyResult$LazyAbstractListIterator.computeNext(LazyResult.java:210)	at org.datanucleus.store.appengine.query.AbstractIterator.tryToComputeNext(AbstractIterator.java:132)	at org.datanucleus.store.appengine.query.AbstractIterator.hasNext(AbstractIterator.java:127)	at org.datanucleus.store.appengine.query.LazyResult$AbstractListIterator.hasNext(LazyResult.java:169)	at teammates.storage.api.FeedbackSessionsDb.getNonPrivateFeedbackSessions(FeedbackSessionsDb.java:162)	at teammates.logic.core.FeedbackSessionsLogic.getFeedbackSessionsClosedWithinThePastHour(FeedbackSessionsLogic.java:1643)	at teammates.logic.core.FeedbackSessionsLogic.scheduleFeedbackSessionClosedEmails(FeedbackSessionsLogic.java:1664)	at teammates.logic.automated.FeedbackSessionClosedRemindersServlet.doGet(FeedbackSessionClosedRemindersServlet.java:24)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)	at teammates.storage.datastore.DatastoreFilter.doFilter(DatastoreFilter.java:29)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:50)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)	at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)	at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)	at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:504)	at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:446)	at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:453)	at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:276)	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:312)	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:304)	at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:450)	at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)	at java.lang.Thread.run(Thread.java:745)