Write Text Stream

Writes a Spark dataframe stream into a text stream.

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

Arguments

x

A Spark DataFrame or dplyr operation

path

The destination path. 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".

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

# NOT RUN {
sc <- spark_connect(master = "local")

dir.create("text-in")
write.csv("A text entry", "text-in/text.txt", row.names = FALSE)

stream <- stream_read_text(sc, "text-in") %>% stream_write_text("text-out")

stop_stream(stream)

# }