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1、HadoopOperationsEricSammerBeijing•Cambridge•Farnham•Köln•Sebastopol•TokyoHadoopOperationsbyEricSammerCopyright©2012EricSammer.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurchasedforeduc
2、ational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:MikeLoukidesandCourtneyNashIndexer:JayMarchandProductionEdito
3、r:MelanieYarbroughCoverDesigner:KarenMontgomeryCopyeditor:AudreyDoyleInteriorDesigner:DavidFutatoIllustrator:RobertRomanoSeptember2012:FirstEdition.RevisionHistoryfortheFirstEdition:2012-09-25FirstreleaseSeehttp://oreilly.com/catalog/errata.csp?isbn=9781449327057forreleasedetails.Nutshell
4、Handbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.HadoopOperations,thecoverimageofaspottedcavy,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademark
5、s.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorassumenoresponsibilityforerrorsoromissions,orfordamagesresultingfromth
6、euseoftheinformationcon-tainedherein.ISBN:978-1-449-32705-7[LSI]1348583608ForAida.TableofContentsPreface.....................................................................ix1.Introduction...........................................................12.HDFS..................................
7、................................7GoalsandMotivation7Design8Daemons9ReadingandWritingData11TheReadPath12TheWritePath13ManagingFilesystemMetadata14NamenodeHighAvailability16NamenodeFederation18AccessandIntegration20Command-LineTools20FUSE23RESTSupport233.MapReduce....
