Write Delta Stream

Writes a Spark dataframe stream into a Delta Lake table.

stream_write_delta(
  x,
  path,
  mode = c("append", "complete", "update"),
  checkpoint = file.path("checkpoints", random_string("")),
  options = list(),
  ...
)

Arguments

x

A Spark DataFrame or dplyr operation

path

The path to the file. Needs to be accessible from the cluster. Supports the "hdfs://", "s3a://" and "file://" protocols.

mode

Specifies how data is written to a streaming sink. Valid values are "append", "complete" or "update".

checkpoint

The location where the system will write all the checkpoint information to guarantee end-to-end fault-tolerance.

options

A list of strings with additional options.

...

Optional arguments; currently unused.

Details

Please note that Delta Lake requires installing the appropriate package by setting the packages parameter to "delta" in spark_connect()

See also

Examples

if (FALSE) { library(sparklyr) sc <- spark_connect(master = "local", version = "2.4", packages = "delta") dir.create("text-in") writeLines("A text entry", "text-in/text.txt") text_path <- file.path("file://", getwd(), "text-in") stream <- stream_read_text(sc, text_path) %>% stream_write_delta(path = "delta-test") stream_stop(stream) }