h2o: h2o.exportFile – R documentation

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h2o.exportFile

Export an H2O Data Frame (H2OFrame) to a File or to a collection of Files.

Description

Exports an H2OFrame (which can be either VA or FV) to a file. This file may be on the H2O instace's local filesystem, or to HDFS (preface the path with hdfs://) or to S3N (preface the path with s3n://).

Usage

h2o.exportFile(
  data,
  path,
  force = FALSE,
  sep = ",",
  compression = NULL,
  parts = 1,
  header = TRUE,
  quote_header = TRUE
)

Arguments

`data`	An H2OFrame object.
`path`	The path to write the file to. Must include the directory and also filename if exporting to a single file. May be prefaced with hdfs:// or s3n://. Each row of data appears as line of the file.
`force`	logical, indicates how to deal with files that already exist.
`sep`	The field separator character. Values on each line of the file will be separated by this character (default ",").
`compression`	How to compress the exported dataset (default none; gzip, bzip2 and snappy available)
`parts`	integer, number of part files to export to. Default is to write to a single file. Large data can be exported to multiple 'part' files, where each part file contains subset of the data. User can specify the maximum number of part files or use value -1 to indicate that H2O should itself determine the optimal number of files. Parameter path will be considered to be a path to a directory if export to multiple part files is desired. Part files conform to naming scheme 'part-m-?????'.
`header`	logical, indicates whether to write the header line. Default is to include the header in the output file.
`quote_header`	logical, indicates whether column names should be quoted. Default is to use quotes.

Details

In the case of existing files force = TRUE will overwrite the file. Otherwise, the operation will fail.

Examples

## Not run: 
library(h2o)
h2o.init()
iris_hf <- as.h2o(iris)

# These aren't real paths
# h2o.exportFile(iris_hf, path = "/path/on/h2o/server/filesystem/iris.csv")
# h2o.exportFile(iris_hf, path = "hdfs://path/in/hdfs/iris.csv")
# h2o.exportFile(iris_hf, path = "s3n://path/in/s3/iris.csv")

## End(Not run)

h2o

R Interface for the 'H2O' Scalable Machine Learning Platform

v3.32.1.2

Apache License (== 2.0)

Authors

Erin LeDell [aut, cre], Navdeep Gill [aut], Spencer Aiello [aut], Anqi Fu [aut], Arno Candel [aut], Cliff Click [aut], Tom Kraljevic [aut], Tomas Nykodym [aut], Patrick Aboyoun [aut], Michal Kurka [aut], Michal Malohlava [aut], Ludi Rehak [ctb], Eric Eckstrand [ctb], Brandon Hill [ctb], Sebastian Vidrio [ctb], Surekha Jadhawani [ctb], Amy Wang [ctb], Raymond Peck [ctb], Wendy Wong [ctb], Jan Gorecki [ctb], Matt Dowle [ctb], Yuan Tang [ctb], Lauren DiPerna [ctb], Tomas Fryda [ctb], H2O.ai [cph, fnd]

Initial release

2021-04-29