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The following page has been changed by Evan: http://wiki.apache.org/hadoop/CompressedStorage ------------------------------------------------------------------------------ SET hive.exec.compress.output=TRUE; SET io.seqfile.compression.type=BLOCK; -- NONE/RECORD/BLOCK (see below) INSERT OVERWRITE TABLE raw_sequnce SELECT LINE FROM raw; + + INSERT OVERWRITE TABLE raw_sequnce SELECT * FROM raw; -- The previous line did not work for me, but this does. }}} The value for io.seqfile.compression.type determines how the compression is performed. If you set it to RECORD you will get as many output files as the number of map/reduce jobs. If you set it to BLOCK, you will get as many output files as there were input files. There is a tradeoff involved here -- large number of output files => more parellel map jobs => lower compression ratio.
