Qhov sib txawv tseem ceeb ntawm RDBMS thiab Hadoop yog tias RDBMS khaws cov ntaub ntawv tsim kho thaum lub Hadoop khw muag khoom cov qauv, ib nrab qauv, thiab cov ntaub ntawv tsis muaj qauv.
RDBMS yog qhov kev tswj hwm database raws li tus qauv kev sib raug zoo. Lub Hadoop yog software rau khaws cov ntaub ntawv thiab khiav daim ntawv thov ntawm pawg ntawm cov khoom siv kho vajtse.
RDBMS yog dab tsi?
RDBMS sawv cev rau Kev Sib Raug Zoo Database Management System raws li tus qauv kev sib raug zoo. Hauv RDBMS, cov ntxhuav tau siv los khaws cov ntaub ntawv, thiab cov yuam sij thiab cov ntawv ntsuas pab txuas cov ntxhuav. Lub rooj yog ib qho kev sau ntawm cov ntaub ntawv, thiab lawv yog cov koom haum. Nws muaj kab thiab kab. Cov kab sawv cev ib zaug nkag rau hauv lub rooj. Cov kab sawv cev rau tus cwj pwm.
Piv txwv li, cov ntaub ntawv muag khoom tuaj yeem muaj cov neeg siv khoom thiab cov khoom lag luam. Tus neeg siv khoom tuaj yeem muaj tus cwj pwm xws li customer_id, npe, chaw nyob, phone_no. Cov khoom tuaj yeem muaj tus cwj pwm xws li product_id, npe thiab lwm yam. Lub ntsiab lus tseem ceeb ntawm cov neeg siv khoom yog customer_id thaum lub ntsiab tseem ceeb ntawm cov khoom rooj yog product_id. Muab cov khoom_id tso rau hauv lub rooj cov neeg siv khoom raws li tus yuam sij txawv teb chaws txuas ob lub koom haum no. Ib yam li ntawd, cov ntxhuav kuj muaj feem cuam tshuam rau ib leeg. Lawv muab cov ntaub ntawv ncaj ncees, normalization, thiab ntau ntxiv. Ob peb ntawm RDBMS feem ntau yog MySQL, MSSQL thiab Oracle. Lawv siv SQL rau querying.
Hadoop yog dab tsi?
Lub Hadoop yog Apache qhib qhov chaw sau hauv Java. Nws pab khaws cia thiab ua cov ntaub ntawv ntau ntau thoob plaws pawg ntawm cov khoos phis tawj siv cov qauv kev ua haujlwm yooj yim. Lub hom phiaj tseem ceeb ntawm Hadoop yog khaws thiab ua cov ntaub ntawv loj, uas yog hais txog ntau cov ntaub ntawv nyuaj. Kev xa tawm ntawm Hadoop, uas yog lub peev xwm los ua cov ntaub ntawv ntim hauv ib lub sijhawm tshwj xeeb, yog siab.
Muaj plaub qhov qauv hauv Hadoop architecture. Lawv yog Hadoop ntau, YARN, Hadoop Distributed File System (HDFS), thiab Hadoop MapReduce. Cov qauv sib xws muaj cov tsev qiv ntawv Java thiab cov khoom siv hluav taws xob. Nws kuj muaj cov ntaub ntawv los pib Hadoop. Hadoop YARN ua txoj haujlwm teem sijhawm thiab kev tswj hwm pab pawg.
Tsis tas li ntawd, Hadoop Distributed File System (HDFS) yog Hadoop cia system. Nws siv cov master-slave architecture. Master node yog NameNode, thiab nws tswj cov ntaub ntawv system meta cov ntaub ntawv. Lwm lub khoos phis tawj yog qhev nodes lossis DataNodes. Lawv khaws cov ntaub ntawv tiag tiag. Ntawm qhov tod tes, Hadoop MapReduce ua qhov kev faib xam. Nws muaj cov algorithms los ua cov ntaub ntawv. Hauv HDFS, Master node muaj ib txoj haujlwm taug qab. Nws khiav daim ntawv qhia txo cov haujlwm ntawm cov qhev nodes. Muaj Task Tracker rau txhua tus qhev node kom ua tiav cov ntaub ntawv ua tiav thiab xa cov txiaj ntsig rov qab mus rau tus tswv node. Zuag qhia tag nrho, Hadoop muab cov ntaub ntawv khaws cia loj nrog lub zog ua haujlwm siab.
Qhov txawv ntawm RDBMS thiab Hadoop yog dab tsi?
RDBMS vs Hadoop |
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| RDBMS yog qhov software tsim thiab tswj cov ntaub ntawv raws li tus qauv kev sib raug zoo. | Hadoop yog ib phau ntawm cov software qhib uas txuas ntau lub khoos phis tawj los daws cov teeb meem cuam tshuam nrog ntau cov ntaub ntawv thiab kev suav. |
| Cov ntaub ntawv ntau yam | |
| RDBMS khaws cov ntaub ntawv tsim nyog. | Hadoop khw muag khoom tsim, ib nrab qauv thiab tsis muaj cov ntaub ntawv. |
| Data Storage | |
| RDBMS khaws cov ntaub ntawv nruab nrab. | Hadoop khaws cov ntaub ntawv ntau dua li RDBMS. |
| Hauv RDBMS, nyeem nrawm. | Nyob hauv Hadoop, nyeem thiab sau tau nrawm. |
| Scalability | |
| RDBMS muaj ntsug scalability. | Hadoop muaj kab rov tav scalability. |
| Hardware | |
| RDBMS siv high-end servers. | Hadoop siv cov khoom siv kho vajtse. |
| Kev xa tawm | |
| RDBMS throughput yog siab dua. | Hadoop throughput qis dua. |
Summary – RDBMS vs Hadoop
Kab lus no tau tham txog qhov sib txawv ntawm RDBMS thiab Hadoop. Qhov sib txawv tseem ceeb ntawm RDBMS thiab Hadoop yog tias RDBMS khaws cov ntaub ntawv tsim kho thaum lub Hadoop khw muag khoom tsim, ib nrab thiab cov ntaub ntawv tsis muaj qauv.
