Apress - Pro Hadoop.pdf

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1、cyanyelloWMaGenTaBlackpanTone123cBooksforprofessionalsByprofessionals®TheeXperT’sVoice®inopensourceCompanioneBookAvailableProHadoopProHadoopDearReader,ProHadoopisaguidetousingHadoopCore,awonderfultoolthatallowsyoutouseordinaryhardwaretosolveextraordinaryproblems.Inthecourseofmywork,Ihaveneededtobuil

2、dapplicationsthatwouldnotfitonasingleafford-ablemachine,creatingcustomscalinganddistributiontoolsintheprocess.WiththeadventofHadoopandMapReduce,IhavebeenabletofocusonmyProapplicationsinsteadofworryingabouthowtoscalethem.IttooksometimebeforeIhadlearnedenoughaboutHadoopCoretoactu-allybeeffective.Thisb

3、ookisadistillationofthatknowledge,andabookIwishwasavailabletomewhenIfirststartedusingHadoopCore.IbeginbyshowingyouhowtogetstartedwithHadoopandtheHadoopCoresharedfilesystem,HDFS.Thenyouwillseehowtowriteandrunfunc-tionalandeffectiveMapReducejobsonyourclusters,aswellashowtotuneyourjobsandclustersforopt

4、imumperformance.Iproviderecipesforunittest-inganddetailsonhowtodebugMapReducejobs.IalsoincludeexamplesofHadoopusingadvancedfeaturessuchasmap-sidejoinsandchainmapping.Tobringeverythingtogether,Itakeyouthroughthestep-by-stepdevelopmentofanontrivialMapReduceapplication.Thiswillgiveyouinsightintoareal-w

5、orldHadoopproject.Itismysincerehopethatthisbookprovidesyouanenjoyablelearningexpe-rienceandwiththeknowledgeyouneedtobethelocalHadoopCorewizard.JasonVennerBuildscalable,distributedapplicationsinthecloudTHEAPRESSROADMAPProAmazonEC2andWSCompanioneBookBeginningScalaProHadoopBeginningGoogleAppEngineTheDe

6、finitiveGuideSeelastpagefordetailstoTerracottaon$10eBookversionSOURCE CODE ONLINEVennerwww.apress.comJasonVennerISBN978-1-4302-1942-253999US$39.99ShelveinSoftwareEngineering/SoftwareDevelopmentUserlevel:9781430219422Intermediate–Advancedthisprintforcontentonly—size&colornotaccuratespine=0.844"440pag

7、ecountProHadoopJasonVennerProHadoopCopyright©2009byJasonVennerAllrightsreserved.Nopartofthisworkmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopying,recording