Video: Dab tsi yog MAP sab koom hauv lub txim?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Daim ntawv qhia sab koom yog ib txoj kev uas koom nruab nrab ntawm ob lub rooj yog ua nyob rau hauv lub Daim ntawv qhia theem tsis muaj kev koom tes ntawm Txo theem. Daim ntawv qhia - sab Joins tso cai rau lub rooj kom tau loaded rau hauv nco kom ceev ceev heev koom kev ua haujlwm, ua tiav hauv daim duab qhia thiab qhov ntawd dhau los yam tsis tas siv ob qho tib si daim ntawv qhia thiab txo cov theem.
Kuj paub, MAP sab koom yog dab tsi thiab txo sab koom Hive?
Daim ntawv qhia sab koom feem ntau yog siv thaum ib cov ntaub ntawv teev loj thiab lwm cov ntaub ntawv teev me me. Raws li qhov Txo sab koom ua tau koom ob qho tib si cov ntaub ntawv loj. Cov Daim ntawv qhia sab koom yog sai dua li nws tsis tas yuav tos rau tag nrho cov mappers kom tiav raws li nyob rau hauv cov ntaub ntawv ntawm reducer . Li no txo sab koom qeeb dua.
Dab tsi yog qhov zoo ntawm kev siv MAP sab koom? Qhov zoo ntawm kev siv daim ntawv qhia sab koom : Daim ntawv qhia - sab koom pab txo qis tus nqi uas tshwm sim rau kev txheeb xyuas thiab sib koom ua ke hauv kev sib tsoo thiab txo cov theem. Daim ntawv qhia - sab koom kuj pab txhim kho kev ua haujlwm ntawm kev ua haujlwm los ntawm kev txo lub sijhawm kom ua tiav txoj haujlwm.
Tom qab, lo lus nug yog, dab tsi yog kev tshaj tawm koom nrog hauv lub txim?
Teeb SQL siv tshaj tawm koom (aka tshaj tawm hash koom ) hloov hash koom ua kom zoo koom queries thaum qhov loj ntawm ib sab cov ntaub ntawv hauv qab no spark . Nws tuaj yeem zam kev xa tag nrho cov ntaub ntawv ntawm lub rooj loj hauv lub network.
Kev koom nrog kev tshaj tawm yog dab tsi?
Tshaj tawm koom nrog yog ib txoj hauv kev zoo los ntxiv cov ntaub ntawv khaws cia hauv ib qho me me ntawm cov ntaub ntawv tseeb cov ntaub ntawv rau DataFrames loj. DataFrames mus txog 2GB tuaj yeem tshaj tawm yog li cov ntaub ntawv cov ntaub ntawv nrog kaum lossis ntau pua txhiab kab yog ib qho tshaj tawm tus neeg sib tw.
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