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Showing content from https://spark.apache.org/docs/latest/api/R/reference/sampleBy.html below:

Returns a stratified sample without replacement — sampleBy • SparkR

Returns a stratified sample without replacement based on the fraction given on each stratum.

sampleBy(x, col, fractions, seed)

# S4 method for class 'SparkDataFrame,character,list,numeric'
sampleBy(x, col, fractions, seed)

x

A SparkDataFrame

col

column that defines strata

fractions

A named list giving sampling fraction for each stratum. If a stratum is not specified, we treat its fraction as zero.

seed

random seed

A new SparkDataFrame that represents the stratified sample

sampleBy since 1.6.0

if (FALSE) { # \dontrun{
df <- read.json("/path/to/file.json")
sample <- sampleBy(df, "key", fractions, 36)
} # }

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