Venkatesh Kavuluri 2013-02-06, 21:38
-Using hadoop streaming with binary data
Jay Hacker 2013-02-07, 15:19
Is it possible to pass unmolested binary data through a map-only streaming
job from the command line? I.e., is there a way to avoid extra tabs and
newlines in the output? I don't need input splits or key/value pairs, I
just want one whole input file fed unmodified into a program, and its
output written unmodified to HDFS. For example, I'd like to run:
hadoop jar hadoop-streaming.jar -mapper cat -numReduceTasks 0 -input in
and have 'out' be exactly the same as 'in'.
There does not seem to be a way to set
mapreduce.output.textoutputformat.separator to the empty string, and
typedbytes prepends the size. Is there a way to leave data alone out of
the box, or will I have to write a custom InputFormat and OutputFormat?