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1、SECONDEDITIONHadoop:TheDefinitiveGuideTomWhiteforewordbyDougCuttingBeijing•Cambridge•Farnham•Köln•Sebastopol•TokyoHadoop:TheDefinitiveGuide,SecondEditionbyTomWhiteCopyright©2011TomWhite.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinH
2、ighwayNorth,Sebastopol,CA95472.O’Reillybooksmaybepurchasedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:(800)998-9938orcorporate@oreilly.co
3、m.Editor:MikeLoukidesIndexer:JayBookServicesProductionEditor:AdamZarembaCoverDesigner:KarenMontgomeryProofreader:DianeIlGrandeInteriorDesigner:DavidFutatoIllustrator:RobertRomanoPrintingHistory:June2009:FirstEdition.October2010:SecondEdition.NutshellHandbook,theNutshellHandbooklogo,a
4、ndtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.Hadoop:TheDefinitiveGuide,theimageofanAfricanelephant,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignat
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6、tioncon-tainedherein.ISBN:978-1-449-38973-4[SB]1285179414TableofContentsForeword...................................................................xvPreface....................................................................xvii1.MeetHadoop............................................
7、...............1Data!1DataStorageandAnalysis3ComparisonwithOtherSystems4RDBMS4GridComputing6VolunteerComputing8ABriefHistoryofHadoop9ApacheHadoopandtheHadoopEcosystem122.MapReduce...........................................................15AWeatherDataset15DataFormat15AnalyzingtheDat
8、awithUnixToo
