sample codes for testing
1. compression
# To make a compress files per block by mapper.
hadoop jar hadoop-streaming-2.2.0.2.1.0.0-92.jar \
-D mapreduce.output.fileoutputformat.compress=TRUE \
-D mapreduce.output.fileoutputformat.compress.type=RECORD \
-D mapreduce.output.fileoutputformat.compress.codec=org.apache.hadoop.io.compress.BZip2Codec...