Video: Dab tsi yog kab hauv PySpark?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A kab hauv SchemaRDD. Cov teb hauv nws tuaj yeem nkag tau zoo li cov cwj pwm. Kab tuaj yeem siv los tsim ib qho kab khoom los ntawm kev siv lub npe sib cav, cov teb yuav raug txheeb los ntawm cov npe.
Tsis tas li ntawd, Column Pyspark yog dab tsi?
Spark nrog Kab () muaj nuj nqi yog siv los hloov npe, hloov tus nqi, hloov cov ntaub ntawv ntawm ib kab DataFrame uas twb muaj lawm thiab tseem tuaj yeem siv los tsim ib kab tshiab, ntawm no ncej, kuv yuav taug kev koj los ntawm kev siv DataFrame kem ua haujlwm nrog Scala thiab Pyspark piv txwv.
Tsis tas li, koj ua li cas qhia DataFrame hauv Pyspark? Feem ntau muaj peb txoj kev sib txawv uas koj tuaj yeem siv los luam cov ntsiab lus ntawm dataframe:
- Luam tawm Spark DataFrame. Txoj kev tshaj plaws yog siv qhov show() ua haujlwm: >>> df.
- Sau Spark DataFrame vertically.
- Hloov mus rau Pandas thiab luam Pandas DataFrame.
Ib yam li ntawd, koj tuaj yeem nug, Pyspark yog dab tsi?
PySpark Programming. PySpark yog kev sib koom tes ntawm Apache Spark thiab Python. Apache Spark yog qhov qhib-qhov kev sib koom ua ke, tsim nyob ib puag ncig ceev, yooj yim ntawm kev siv, thiab streaming analytics whereas Python yog hom lus dav dav, qib siab programming.
Kuv yuav koom nrog Pyspark li cas?
Cov ntsiab lus: Pyspark DataFrames muaj ib koom txoj kev uas yuav siv peb tsis: DataFrame nyob rau sab xis ntawm lub koom , Cov teb twg tau koom nrog, thiab hom twg koom (sab hauv, sab nraud, sab laug_outer, sab xis_outer, sab laug). Koj hu lub koom txoj kev los ntawm sab laug sab DataFrame khoom xws li df1. koom (df2, ib.
Pom zoo:
Dab tsi yog qhov txawv ntawm tus kab mob los ntawm tus kab mob?
Qhov sib txawv tseem ceeb ntawm tus kab mob thiab tus kab mob yog cov kab mob yuav tsum tau tshwm sim los ntawm kev ua kom lawv tus tswv tsev; whereas worms yog stand-alone siab phem cov kev pab cuam uas muaj peev xwm nws tus kheej-replicate thiab propagate nws tus kheej sai li sai tau raws li lawv tau ua txhaum lub system
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