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1、FastDatabaseRestartsatFacebookAakashGoel,BhuwanChopra,CiprianGerea,DhrúvMátáni,JoshMetzler,FahimUlHaq,andJanetL.WienerFacebook,Inc.ABSTRACT1.INTRODUCTIONFacebookengineersquerymultipledatabasestomonitorandFacebookengineersquerymultipledatabasesystemstoanalyzeFacebookproductsandservices.Th
2、efastestofmonitorandanalyzeFacebookproductsandservices.Scuba[5]thesedatabasesisScuba,whichachievessubsecondqueryisaveryfast,distributed,in-memorydatabaseusedexten-responsetimebystoringallofitsdatainmemoryacrosssivelyforinteractive,adhoc,analysisqueries.Thesequerieshundredsofservers.Wearec
3、ontinuallyimprovingthecodetypicallyruninunderasecondoverGBsofdata.Scubapro-forScubaandwouldliketopushnewsoftwarereleasesatcessesalmostamillionqueriesperdayforover1500Face-leastonceaweek.However,restartingaScubamachinebookemployees.Inaddition,Scubaistheworkhorsebehindclearsitsmemory.Recove
4、ringallofitsdatafromdisk
5、Facebook'scoderegressionanalysis,bugreportmonitoring,about120GBpermachine
6、takes2.5-3hourstoreadandadsrevenuemonitoring,andperformancedebugging.formatthedatapermachine.Even10minutesisalongOnesigni cantsourceofdowntimeissoftwareupgrades,downtimeforthecriticalapplica
7、tionsthatrelyonScuba,yetupgradesarenecessarytointroducenewfeaturesandsuchasdetectinguser-facingerrors.Restartingonly2%ofapplybug xes.AtFacebook,weareaccustomedtothetheserversatatimemitigatestheamountofunavailableagilitythatcomeswithfrequentcodedeployments.Newdata,butprolongstherestartdura
8、tiontoabout12hours,codeisrolledouttoourwebproductmultipletimeseachduringwhichusersseeonlypartialqueryresultsandoneweek[9].TheFacebookAndroidAlphaprogramalsore-engineerneedstomonitortheserverscarefully.Weneedleasescodemultipletimesaweek[18,17].Wewouldliketoafaster,lessengineerintensive,sol
9、utiontoenablefrequentdeploynewcodetoScubaatleastonceaweekaswell.softwareupgrades.However,anydowntimeonScuba'spartisaproblemforInthispaper,weshowthatusingsharedmemoryprovidesthemanytoolsandusersthatdependonit.Whenaserverasimple,e ective,fast,solutiontoupgradingserver
