1.先在hive-site.xml中设置小文件的标准.
<property> <name>hive.merge.smallfiles.avgsize</name> <value>536870912</value> <description>When the average output file size of a job is less than this number, Hive will start an additional map-reduce job to merge the output files into bigger files. This is only done for map-only jobs if hive.merge.mapfiles is true, and for map-reduce jobs if hive.merge.mapredfiles is true.</description> </property>
2.为只有map的mapreduce的输出并合并小文件.
<property> <name>hive.merge.mapfiles</name> <value>true</value> <description>Merge small files at the end of a map-only job</description> </property>
3.为含有reduce的mapreduce的输出并合并小文件.
<property> <name>hive.merge.mapredfiles</name> <value>true</value> <description>Merge small files at the end of a map-reduce job</description> </property>
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