|Oracle® Big Data Connectors User's Guide
Release 2 (2.1)
Part Number E36961-05
|PDF · Mobi · ePub|
Copies a file from HDFS to the local file system.
The name of a file in HDFS. The file name can include a path that is either absolute or relative to the current path.
The name of a file in the local file system where the data is copied.
Controls whether the operation can overwrite an existing local file. Set to
TRUE to overwrite
FALSE to signal an error (default).
This function provides the fastest and easiest way to copy a file from HDFS. No data transformations occur except merging multiple parts into a single file. The local file has the exact same data as the HDFS file.
This example displays a list of files in the current HDFS directory and copies ontime2000.DB to the local file system as /home/oracle/ontime2000.dat.
R> hdfs.ls()  "ontime2000_DB" "ontime_DB" "ontime_File" "ontime_R" "testdata.dat" R> tmpfile <- hdfs.download("ontime2000_DB", "/home/oracle/ontime2000.dat", overwrite=F) R> tmpfile  "/home/oracle/ontime2000.dat"