Remoteaccessdenied

accessdenied  时间:2021-04-13  阅读:()
SystemsSeminarScheduleMonday,18Februrary,4pm:"NewWineinOldBottles"-DouglasThain4March:Noseminar:Paradyn/CondorWeekTuesday,19March,3pm:"TheMicrosoft.
NETSystem"-MikeLitzkowTuesday,2April,3pm:"CondorandtheGrid"-MironLivnyMonday,15April,4pm:"ExploitingGray-BoxKnowledgeofBuffer-CacheManagement"-NathanBurnettMonday,29April,4pm:"BridgingtheInformationgapinStorageProtocolStacks"-TimDenehyNewWineinOldBottles:JavaonCondorDouglasThainUniversityofWisconsin18February2002AbstractWehaveaddedJavasupporttoCondor.
I'lltellyouhowitworksandhowtouseit.
Therearesomeniftyfeaturesforendusers.
Addingthiscodeforcedustothinkaboutthefundamentalproblemofcouplingsystemsandrepresentingerrors.
Alesson:Onemustconsiderthescopeofanerroraswellasitsdetail.
Disclaimer:Thisisstillrougharoundtheedges.
(Someonehadtogofirst!
)OutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsJavaforScientificComputingJavaisemergingasatoolforlargescale(Grande)scientificcomputing.
Moreaccessibletodomainscientists.
Simplifiedporting.
Fasterdevelopment,debugging.
Usercommunitiesareforming:ACMJavaGrandeConferenceTheJavaGrandeForumA.
Globus,E.
Langhirt,M.
Livny,R.
Ramamurthy,M.
Solomon,andS.
Traugott.
JavaGenesandCondor:Cycle-Scavenginggeneticalgorithms.
ACMConfonJavaGrande,2000.
LimitationsJavafloatingpointandcomplexarithmeticdonotyetsatisfyallofthescientificcommunity.
Argumentscontinuebetweenindustryandacademia.
JavaisyetslowerthancomparableprogramsinC/C++/Fortran.
WATcompilersandJITcompilersarecatchingup.
Youchoose:2xslowdownvs5xmachines.
Canwereallyharness5xmachineswhilestillmaintainingplatformindependenceCondorforScientificComputingCondorcreatesahigh-throughputcomputingsystemonacommunityofcomputers.
Ahigh-throughputcomputingsystemseekstomaximizetheamountofworkdoneoveralongperiodoftime.
Acommunityofcomputersmaybeanycollectionofmachinesthatagreetoworktogether.
CondorEnablesOrdinaryUsersINFNCentralManagercondorscheddJobJobJobJobJobcondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpuJobJobJobJobJobJobcondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpuJobJobJobJobJobJobcondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpucondorstartdRAMcpuJobJobJobJobJobJobUWCSCentralManager226CondorPools5576CondorHostsTop10CondorPools:TheHype:Java:"Writeonce,runanywhere!
"Condor:"Submitonce,runeverywhere!
"TheGrid:Uniform,dependable,consistent,pervasive,andinexpensivecomputing.
TheRealityCouplingsystemsisnottrivial!
Theeasypart:Puttingjavainfrontoftheprogramname.
Thetrickyparts:Javainstallationmesses.
Unavailablefilesystems.
Distinguishingprogramerrorsfromenvironmentalerrors.
OutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsscheddstartdMatchMakerMachinePoliciesJobPoliciesHomeFileSystemClaimingProtocolActivationProtocolMatchmakingProtocolExecutionProtocolshadowstarterForkForkTheJobForkCreatestheexecutionenvironment.
Exportsthedetails,policy,andI/Oservices.
JVMForkstartershadowForkForkHomeFileSystemWrapperI/OLibraryTheJobI/OServerI/OProxySecureRemoteI/OLocalSystemCallsLocalI/O(Chirp)UserInterfacecondor_status-javaNameJavaVendorVerStateActivityLoadAvMemaish.
cs.
wisc.
SunMicrosy1.
2.
2OwnerIdle0.
000249anfrom.
cs.
wisSunMicrosy1.
2.
2OwnerIdle0.
030249babe.
cs.
wisc.
SunMicrosy1.
2.
2ClaimedBusy1.
120123.
MachinesOwnerClaimedUnclaimedMatchedPreemptingINTEL/LINUX514101408500Total514101408500UserInterfaceuniverse=javaexecutable=Main.
classjar_files=MyLibrary.
jarinput=infileoutput=outfilearguments=Main123queuecondor_submitI/OInterfaceInput,output,anderrorfilesareautomaticallytransferredto/fromtheexecutionsite.
Anyothernamedfilesmaybetransferredaswell.
TodoonlineI/Owithouttransferringwholefiles,youmustmakesmallchangestothecode:FileInputStream->ChirpInputStreamFileOutputStream->ChirpOutputStreamApplicationJavaStandardLibrariesJavaVirtualMachineOperatingSystemCStandardLibraryChirpI/OLibraryAddedanewlibraryonexistinginterfaces.
Usermustcallnewconstructors.
JNIJavasymbolsarefullyqualified,sotransparentreplacedmentofclassesisnotpossible.
CouldreplacenativemethodsintheJVM,butthistiesustoopen-sourceJVMs.
Couldtraprealsystemcalls,butthesearecomplex(asynchronous,nonblocking,threaded)andmaybedifficulttodistringuishfromtheJVM'sownoperations.
OutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsInitialExperienceBadnews:Nearlyanyunexpectedfailurewouldcausethejobtobereturnedtotheuser:Outofmemoryatexecutionsite.
Javamisconfiguredatexecutionsite.
I/Oproxycan'tinitialize.
Homefilesystemoffline.
InitialExperienceAlthoughthiswascorrectinsomesense--theinformationwastrue--itwasveryfrustrating.
Userswanttoknowwhentheirprogramfailsbydesign(NullPointerException,)butnotifitfailsduetotheenvironment.
WhatdidwedowrongOutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsALittleErrorTheoryBuildonstandarddefinitionsfromfault-toleranceandprogramminglanguages.
Somebriefexamplestogettheidea.
ReturntoCondorandusethetheorytounderstandourdesignmistakes.
FaultToleranceTerminologyFailureAnexternally-visibledeviationfromspecifications.
ErrorAninternaldatastatethatleadstoafailure.
FaultAnexternaleventthatcreatesanerror.
A.
AvizienisandJ.
C.
Laprie.
Dependablecomputing:Fromconceptstodesigndiversity.
IEEE74(5)May1986.
ExampleClientServerWhatissqrt(4)Hmm,sqrt(4)is.
.
.
Hmm,sqrt(9)is.
.
.
Answer:3ERRORFAILUREFAULTImpliciterrorsThesystemclaimstohavereachedavalidresult,butanauditorclaimsitisinvalid.
Example:sqrt(3)==2ExpliciterrorsThesystemtellsusitcannotcompletethedesiredaction.
Example:filenotfound.
EscapingerrorsThesystemdetectsanerror,buthasnomethodofreportingit,soitescapesbyanalternateroute.
Example:coredump,kernelpanic.
JohnB.
Goodenough,ExceptionHandling:issuesandaproposednotation.
CACM18(120,December1975.
K.
EkandhamandA.
Bernstein.
SomenewTransitionsinhierarchicallevelstructures.
OperatingSystemsReview12(4),1978.
ProgramVirtualMemorySystemPhysicalMemoryBackingStoreloaddataCouldreturnadefaultvalue,butthatcreatesanimpliciterror.
Wouldliketoreturnanexpliciterror,butaloadinsnhasnoexitcode.
ParentProcessEscapingerror:Telltheparentthattheprogramcouldnotcomplete.
NormalExitAbnormalExitInterfaceContractsintload(intaddress);Theimplementormusteithercomputearesultthatconformstothecontract,orisobligedtocauseanescapingerror.
C.
Hoare.
Anaxiomaticbasisforcomputerprogramming.
CACM12(10:576-580,October1969.
B.
Meyer.
Object-OrientedSoftwareConstruction.
PrenticeHall,1997.
Exceptionsintopen(Stringfilename)throwsFileNotFound,AccessDenied;Alanguagewithexceptionsprovidesmorestructuretothecontract.
Adeclaredexceptionisanexpliciterror.
Yet,escapingerrorsarestillpossible.
ProgramVirtualFileSystemMemoryDiskopenSuccess,FileNotFound,AccessDeniedParentProcessNormalExitAbnormalExitMemoryCorrupt,DiskOffline,PigeonLostINTERFACEIMPLEMENTATIONErrorScopeInordertobeacceptedbyendusers,adistributedsystemmustbeabletodistinguishbetweenerrorscomputedbytheprogramanderrorsforceduponitbytheenvironment.
Weusethetermscopetodrawthedistinction.
ErrorScopeThescopeofanerroristheportionofthesystemthatitinvalidates.
Anerrormustbedeliveredtotheprocessresponsibleformanagingthatscope.
CallingFunctionFileFileNotFoundHandlerScopeErrorParentProcessPVMClusterPVMNodeCrashHypervisororOperatorMachineCacheCoherencyProblemParentProcessProcessRPCDisconnectErrorDetailThedetailofanerrordescribesinphenomenologicaltermsthecauseoftheerror.
Intherighthands,thedetailisuseful.
Inthewronghands,thedetailcanbemisleading.
SupposeopenreturnsAccessDenied.
.
.
Fileisnotaccessible-Ok.
Librarycontaining'open'isnotaccessible-Problem!
LessonsPrinciple1:Aroutinemustnotgenerateanimpliciterrorasaresultofreceivinganexpliciterror.
Principle2:Anescapingerrorconvertsapotentialimpliciterrorintoanexpliciterroratahigherlevel.
Principle3:Anescapingerrormustbepropagatedtotheprogramthatmanagestheerror'sscope.
OutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsJavaandCondorRevisitedWhatdidwedowrongWefocussedonerrordetailwithoutconsideringerrorscope.
JavaandCondorRevisitedTofixthesystem,werevisitedthenotionoferrorscopethroughout.
Twoexamples:JVMexitcodeI/OerrorsJVMExitCode1JobException:Programimagecorrupt.
1LocalResourceException:Homefilesystemoffline.
1RemoteResourceException:JavaMisconfigured.
1VirtualMachineException:Outofmemory.
1ProgramException:Nullpointer.
xProgramProgramexitedthroughSystem.
exit(x)0ProgramProgramexitedbycompletingmainExitCodeScopeDetailJVMstartershadowForkForkHomeFileSystemWrapperI/OLibraryTheJobResultFileJVMResultResultofExecutionAttempt+ResultofProgram,Ifany.
StarterResult+ProgramResultI/OErrorScopeAllJavaI/Ooperationsthrowasingleexceptiontype--IOException.
Ourmistake:convertalldetectederrorsintoIOExceptionsandpassthemtotheprogram.
MakessenseforFileNotFound,butnotforProxyUnavailableorCredentialsExpired.
JVMstarterWrapperI/OLibraryTheJobResultFileJVMResultResultofExecutionAttempt+ResultofProgram,Ifany.
ToI/OProxyErrorOutsideProgramScopeErrorInsideProgramScopeOutlineWhyJavaandCondorArchitectureInitialExperienceALittleErrorTheoryChangesfortheBetterConclusionsConclusionWestartedbuildingtheJavaUniversewithsomenaiveassumptionsabouterrors.
Onencounteringpracticaldifficulties,wethoughtmoreabstractlyabouterrorsanddevelopedthenotionofscopeanddetail.
Byroutingerrorsaccordingtotheirscope,wemadethesystemmorerobustandusable.
FoodforThoughtThereisn'talwaysaneasywaytopropagateanerrortothescopehandler.
Escapingerrortoparentprocess:RaiseaPOSIXsignal.
Escapingerrortothestarter:ThrowaJavaError,trappedbytheWrapper,placedinfile,readafterprocessexits.
FoodforThoughtThemereuseofexceptionsinaprogramdoesnotimplyadisciplinederrormanagement.
Forexample,throwsIOExceptionisaveryvaguestatementaboutaninterface.
WhatisanimplementorallowedtothrowCanopen()returnFileNotFound(Probably.
)Canread()throwsFileNotFound(Askingfortrouble.
)WhataboutConnectionRefusedFoodforThoughtAncontractcangovernmorethansimplytheinterfacespecification.
Considerthisself-cleaningprogram:fd=open("file");unlink("file");close(fd);WorksonUNIX,failsonWinNT.
Cananinterface(code+docs)reallystateallthenecessarysemanticinformationShoulditDeploymentAsofFebruary14th,theJavaUniverseisrunningon515RedHat7.
2machines.
WillberolledoutaspartofCondor6.
3.
2onallplatformsintheregularreleaseschedule.
SunJDK1.
2.
2onUNIXmachines.
SunJDK1.
3.
2onWinNTmachines.
"IstheJavaUniverseavailableonmymachine"condor_status-javac2clustertuxlabistatskywalker.
cs.
wisc.
eduAcknowledgementsAlthoughwemetakecredit(orblame)forthemostrecentchanges,theCondorarchitecturehasdealtwitherrorsformanyyears.
Muchcreditgoestothecoredesigners,esp.
MikeLitzkow,ToddTannenbaum,andDerekWright.
MoreInfo:TheCondorProject:http://www.
cs.
wisc.
edu/condorTheseslides:http://www.
cs.
wisc.
edu/~thainDouglasThainthain@cs.
wisc.
eduQuestionsnow

亚洲云Asiayu,成都云服务器 4核4G 30M 120元一月

点击进入亚云官方网站(www.asiayun.com)公司名:上海玥悠悠云计算有限公司成都铂金宿主机IO测试图亚洲云Asiayun怎么样?亚洲云Asiayun好不好?亚云由亚云团队运营,拥有ICP/ISP/IDC/CDN等资质,亚云团队成立于2018年,经过多次品牌升级。主要销售主VPS服务器,提供云服务器和物理服务器,机房有成都、美国CERA、中国香港安畅和电信,香港提供CN2 GIA线路,CE...

2021年国内/国外便宜VPS主机/云服务器商家推荐整理

2021年各大云服务商竞争尤为激烈,因为云服务商家的竞争我们可以选择更加便宜的VPS或云服务器,这样成本更低,选择空间更大。但是,如果我们是建站用途或者是稳定项目的,不要太过于追求便宜VPS或便宜云服务器,更需要追求稳定和服务。不同的商家有不同的特点,而且任何商家和线路不可能一直稳定,我们需要做的就是定期观察和数据定期备份。下面,请跟云服务器网(yuntue.com)小编来看一下2021年国内/国...

incogne$2.5/月t芬兰VPS,AMD Ryzen、1Gbps带宽

IncogNet LLC是个由3个人运作的美国公司,主要特色是隐私保护,号称绝对保护用户的隐私安全。业务涵盖虚拟主机、VPS等,支持多种数字加密货币、PayPal付款。注册账号也很简单,输入一个姓名、一个邮箱、国家随便选,填写一个邮箱就搞定了,基本上不管资料的真假。当前促销的vps位于芬兰机房,全部都是AMD Ryzen系列的CPU,性能不会差的!5折优惠码:CRYPTOMONTH,支持:BTC,...

accessdenied为你推荐
现有新的ios更新可用请从ios14be苹果xr可不可以更新ios14accessdenied升级后出现Access denied 如何解决进入查看wordpress模板wordpress模板与主题的区别iproute怎么查看已配置的静态路由centos6.5centos 6.5 无法启动了,不知道是哪里的问题。重庆电信断网这几天为什么重庆电信的网络总是这么不稳定360邮箱lin.long.an@360.com是什么邮箱ipad代理在哪买ipad更便宜Joinsql北京大学cuteftp
虚拟主机租用 到期域名查询 linode代购 腾讯实名认证中心 免费申请个人网站 卡巴斯基破解版 网游服务器 爱奇艺会员免费试用 google台湾 登陆空间 日本代理ip lamp的音标 域名转入 购买空间 云服务是什么意思 带宽测试 hdroad japanese50m咸熟 .htaccess 时间服务器 更多