Cov txheej txheem:
Video: Cov ntaub ntawv sib txawv hauv Hadoop yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Luckily rau koj, cov ntaub ntawv loj hauv zej zog tau pib daws teeb meem ntawm peb qhov zoo cov ntaub ntawv tawm tswv yim siv rau hauv Hadoop pawg: Optimized Row Columnar (ORC), Avro, thiab Parquet.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog hom ntaub ntawv sib txawv?
Muaj peb hom ntaub ntawv map thiab GIS cov ntaub ntawv . Txhua hom yog tuav txawv.
Cov ntaub ntawv hom
- Cov ntaub ntawv-raws li Shapefiles, Microstation Design Files (DGN), GeoTIFF cov duab.
- Directory-based - ESRI ArcInfo Kev Pabcuam, US Census TIGER.
- Cov ntaub ntawv sib txuas - PostGIS, ESRI ArcSDE, MySQL.
Tsis tas li ntawd, hom ntaub ntawv twg yog qhov zoo tshaj plaws hauv Hive? RCFile yog kab columnar hom ntaub ntawv . Qhov no yog lwm daim ntawv ntawm Hive file format uas muaj cov kab theem siab compression. Yog tias koj muaj qhov yuav tsum tau ua ntau rowsat ib zaug ces koj tuaj yeem siv RCFile hom ntawv.
Khaws qhov no hauv kev txiav txim siab, dab tsi yog cov tswv yim tawm tswv yim hauv Hadoop?
InputFormat tsim Inputsplit
- Feem ntau InputFormat yog:
- FileInputFormat- Nws yog lub hauv paus chav kawm rau tag nrho cov ntaub ntawv-basedInputFormat.
- TextInputFormat- Nws yog lub neej ntawd InputFormat ntawmMapReduce.
- KeyValueTextInputFormat- Nws zoo ib yam li TextInputFormat.
- Ua raws li qhov txuas kom paub ntau ntxiv txog InputFormat hauv Hadoop.
Orc file format hauv Hadoop yog dab tsi?
ORC File Format Qhov Optimized Kab Kab ( ORC ) hom ntawv muab txoj hauv kev zoo heev los khaws cov ntaub ntawv Hive. Nws tau tsim los kov yeej cov kev txwv ntawm lwm Hive cov ntaub ntawv . Siv ORC cov ntaub ntawv txhim kho kev ua tau zoo thaum Hiveis nyeem, sau ntawv, thiab ua cov ntaub ntawv.
Pom zoo:
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