为hive设置输出压缩的参数

<!-- map output compress begin-->

<property>
  <name>mapred.compress.map.output</name>
  <value>true</value>
</property>

<property>
  <name>mapred.output.compress</name>
  <value>true</value>
</property>

<property>
  <name>hive.exec.compress.output</name>
  <value>true</value>
  <description> This controls whether the final outputs of a query (to a local/hdfs file or a hive table) is compressed. The compression codec and other options are determined from hadoop config variables mapred.output.compress* </description>
</property>

<property>
  <name>hive.exec.compress.intermediate</name>
  <value>true</value>
  <description> This controls whether intermediate files produced by hive between multiple map-reduce jobs are compressed. The compression codec and other options are determined from hadoop config variables mapred.output.compress* </description>
</property>


<property>
  <name>mapred.output.compression.codec</name>
  <value>org.apache.hadoop.io.compress.GzipCodec</value>
</property>

<property>
  <name>mapred.map.output.compression.codec</name>
  <value>org.apache.hadoop.io.compress.GzipCodec</value>
</property>


<property>
  <name>mapred.output.compression.type</name>
  <value>BLOCK</value>
</property>


<!-- map output compress end-->