Video: Cov ntaub ntawv hauv zos ua tiav li cas hauv Hadoop?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov ntaub ntawv localization hauv Hadoop . Siv cov qauv Wordcount piv txwv, qhov twg cov lus feem ntau tau rov ua dua rau 5 Lacs lossis ntau dua. Nyob rau hauv tas li ntawd tom qab lub Mapper theem, txhua mapper tso zis yuav muaj cov lus nyob rau hauv qhov ntau ntawm 5 Lacs. Cov txheej txheem ua tiav ntawm kev khaws cia Mapper tso tawm rau LFS yog hu ua Data Localization.
Khaws qhov no hauv kev saib, dab tsi yog cov ntaub ntawv hauv zos hauv Hadoop?
Lub tswvyim ntawm Cov ntaub ntawv thaj chaw hauv Hadoop Data thaj chaw hauv MapRub hais txog kev muaj peev xwm txav tau qhov kev xam ze rau qhov tseeb cov ntaub ntawv nyob ntawm node, es tsis txhob txav loj cov ntaub ntawv mus xam. Qhov no minimizes network congestion thiab tsub kom tag nrho cov throughput ntawm lub system.
Tsis tas li ntawd, cov ntaub ntawv loj yuav khaws cia li cas? Cov neeg feem coob tau koom nrog HDFS, lossis Hadoop Distributed File System, nrog Hadoop cov ntaub ntawv cov tsev khaws khoom. HDFS khaws cov ntaub ntawv hauv pawg uas yog tsim los ntawm cov blocks me. Cov blocks no yog khaws cia nyob rau hauv lub cev khaws cia units, xws li internal disk drives.
Ib yam li ntawd, cov ntaub ntawv khaws cia hauv Hadoop li cas?
On ib Hadoop pawg, cov cov ntaub ntawv nyob rau hauv HDFS thiab MapReduce system nyob ntawm txhua lub tshuab hauv pawg. Cov ntaub ntawv yog khaws cia hauv cov ntaub ntawv blocks ntawm DataNodes. HDFS replicates cov cov ntaub ntawv blocks, feem ntau yog 128MB loj, thiab faib lawv kom lawv rov ua dua nyob rau hauv ntau qhov ntawm cov pawg.
Cov ntaub ntawv khaws cia hauv HDFS li cas?
HDFS exposes ib ntaub ntawv system namespace thiab tso cai rau cov neeg siv cov ntaub ntawv ua khaws cia hauv cov ntaub ntawv . Sab hauv, a ntaub ntawv muab faib ua ib los yog ntau lub blocks thiab cov blocks no yog khaws cia hauv ib txheej ntawm DataNodes. Lub NameNode ua haujlwm ntaub ntawv system namespace kev khiav hauj lwm xws li qhib, kaw, thiab renaming cov ntaub ntawv thiab directory.
Pom zoo:
Dab tsi yog cov ntaub ntawv yooj yim tsim los ua thiab nws ua tiav cov haujlwm no li cas?
Lub hom phiaj tseem ceeb tshaj plaws ntawm cov ntaub ntawv kaw lus yog tswj cov neeg siv cov ntaub ntawv. Qhov no suav nrog khaws cia, rov qab thiab kho cov ntaub ntawv. Qee lub tshuab ua ntaub ntawv lees txais cov ntaub ntawv khaws cia raws li cov kwj ntawm bytes uas tau sau thiab khaws cia kom zoo rau kev tshaj tawm
Ntev npaum li cas cov ntaub ntawv tuaj yeem khaws cia hauv cov ntaub ntawv warehouse?
10 xyoo Yog li ntawd, cov ntaub ntawv khaws cia hauv lub tsev khaws ntaub ntawv li cas? Cov ntaub ntawv yog feem ntau khaws cia rau hauv ib lub tsev khaws ntaub ntawv los ntawm cov txheej txheem rho tawm, hloov pauv thiab thauj khoom (ETL), qhov twg cov ntaub ntawv tau muab rho tawm los ntawm qhov chaw, hloov mus rau qhov zoo cov ntaub ntawv thiab ces loaded rau hauv ib lub tsev khaws khoom .
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
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Dab tsi yog cov teeb meem ntawm kev tswj cov ntaub ntawv hauv cov ntaub ntawv ib txwm muaj?
Nyob rau tib lub sijhawm, qhov kev tswj hwm cov ntaub ntawv ib puag ncig tsim teeb meem xws li cov ntaub ntawv rov ua dua thiab tsis sib xws, cov kev pab cuam-cov ntaub ntawv dependence, inflexibility, tsis muaj kev ruaj ntseg, thiab tsis muaj cov ntaub ntawv sib qhia thiab muaj
Kuv yuav ntxig cov ntaub ntawv WAV rau hauv cov ntaub ntawv Word li cas?
Ntxig ib lub suab ntaub ntawv rau hauv koj cov ntaub ntawv txoj hauj lwm qhov ntxig taw tes uas koj xav kom lub soundinserted. Xaiv Object los ntawm Insert. Worddisplays Object dialog box. Nyem rau ntawm Tsim los ntawm Cov Ntaub Ntawv tab. (Saib daim duab 1.) Siv cov kev tswj ntawm lub dialog box los nrhiav cov ntaub ntawv suab uas koj xav tau nrog rau koj cov ntaub ntawv. Nyem rau OK