Write Memory Stream

Writes a Spark dataframe stream into a memory stream.

stream_write_memory(x, name = random_string("sparklyr_tmp_"),
  mode = c("append", "complete", "update"),
  trigger = stream_trigger_interval(),
  checkpoint = file.path("checkpoints", name, random_string("")),
  options = list(), ...)

Arguments

x

A Spark DataFrame or dplyr operation

name

The name to assign to the newly generated stream.

mode

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

trigger

The trigger for the stream query, defaults to micro-batches runnnig every 5 seconds. See stream_trigger_interval and stream_trigger_continuous.

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.

See also

Examples

if (FALSE) { sc <- spark_connect(master = "local") dir.create("csv-in") write.csv(iris, "csv-in/data.csv", row.names = FALSE) csv_path <- file.path("file://", getwd(), "csv-in") stream <- stream_read_csv(sc, csv_path) %>% stream_write_memory("csv-out") stream_stop(stream) }