Puas yog Presto cache cov ntaub ntawv?
Puas yog Presto cache cov ntaub ntawv?

Video: Puas yog Presto cache cov ntaub ntawv?

Video: Puas yog Presto cache cov ntaub ntawv?
Video: Yasmi - Txiv Nraug Ntsuag ft. JN Vang (Music Video) 2024, Kaum ib hlis
Anonim

Presto khw muag khoom nruab nrab cov ntaub ntawv thaum lub sijhawm ua haujlwm hauv nws qhov tsis cache . Txawm li cas los xij, nws tsis yog txhais tau tias ua haujlwm caching tov los yog ib tug pheej cia txheej.

Hauv qhov no, yog Presto database?

Presto yog ib qho kev faib tawm uas khiav ntawm Hadoop, thiab siv cov qauv zoo ib yam li kev ua haujlwm loj heev (MPP) database tswj qhov system. Ua Presto Extensible rau txhua qhov chaw cov ntaub ntawv, nws tau tsim nrog kev cia khoom abstraction kom nws yooj yim los tsim pluggable connectors.

Tsis tas li ntawd, puas siv MapReduce? Presto yog ib qho qhib qhov chaw sib luag SQL execution engine. Tsis zoo li Hive, Presto tsis yog siv tus daim ntawv qhia txo lub moj khaum rau nws ua. Hloov chaw, Presto ncaj qha nkag mus rau cov ntaub ntawv los ntawm ib tug tshwj xeeb faib lus nug cav uas zoo ib yam li cov uas pom nyob rau hauv coj mus muag parallel RDBMSs.

Yog li ntawd, vim li cas Presto ceev?

Yog vim li cas #1: Presto yog Plenty Ceev ceev MapReduce ua haujlwm ntawm tus qauv "rub" thiab rub cov ntaub ntawv los ntawm cov haujlwm ua ntej. Ib theem nce siab tau txais cov ntaub ntawv los ntawm nws cov theem qis, yog li cov ntaub ntawv nruab nrab tuaj yeem hla ncaj qha, yog li ua rau cov lus nug tseem ceeb. sai dua.

Apache Presto ua haujlwm li cas?

Presto yog ib tug faib system uas khiav ntawm ib pawg ntawm cov nodes. Presto cov Kev faib tawm cov lus nug cav tau ua kom zoo rau kev sib tham sib txheeb xyuas thiab txhawb nqa tus qauv ANSI SQL, suav nrog cov lus nug nyuaj, sib sau ua ke, koom nrog, thiab lub qhov rais ua haujlwm. Presto architecture yog yooj yim thiab extensible.

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