in RecommenderJob Class:
line 113 :recommenderConf.setClass("mapred.output.compression.codec", GzipCodec.class, CompressionCodec.class);
because the output here is the final output ,the end user may operates the output through HDFS API,
if compress here ,it not very convenient.
but it's convenient for operation through HDFS shell to get to local.
can provider options or not compress ?