Randomly Sample Rows from a Spark DataFrame
Draw a random sample of rows (with or without replacement) from a Spark DataFrame.
sdf_sample(x, fraction = 1, replacement = TRUE, seed = NULL)
x |
An object coercable to a Spark DataFrame. |
fraction |
The fraction to sample. |
replacement |
Boolean; sample with replacement? |
seed |
An (optional) integer seed. |
The family of functions prefixed with sdf_ generally access the Scala
Spark DataFrame API directly, as opposed to the dplyr interface which
uses Spark SQL. These functions will 'force' any pending SQL in a
dplyr pipeline, such that the resulting tbl_spark object
returned will no longer have the attached 'lazy' SQL operations. Note that
the underlying Spark DataFrame does execute its operations lazily, so
that even though the pending set of operations (currently) are not exposed at
the R level, these operations will only be executed when you explicitly
collect() the table.
Other Spark data frames:
sdf_copy_to(),
sdf_distinct(),
sdf_random_split(),
sdf_register(),
sdf_sort(),
sdf_weighted_sample()
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