四季如風

<property>
  <name>mapred.output.compress</name>
  <value>true</value>
  <description>Should the job outputs be compressed?
  </description>
</property>
 
<property>
  <name>mapred.output.compression.type</name>
  <value>BLOCK</value>
  <description>If the job outputs are to compressed as SequenceFiles, how should
               they be compressed? Should be one of NONE, RECORD or BLOCK.
  </description>
</property>
 
<property>
  <name>mapred.output.compression.codec</name>
  <value>org.apache.hadoop.io.compress.GzipCodec</value>
  <description>If the job outputs are compressed, how should they be compressed?
  </description>
</property>