资源空转

Key不均匀

MapJOIN

Hive配置

  1. <property>
  2.     <name>hive.auto.convert.join</name>
  3.     <value>false</value>
  4. </property>
  5. <property>
  6.     <name>hive.mapjoin.smalltable.filesize</name>
  7.     <value>25000000</value>
  8. </property>
  9. <property>
  10.     <name>hive.mapjoin.followby.gby.localtask.max.memory.usage</name>
  11.     <value>0.55</value>
  12. </property>
  13. <property>
  14.     <name>hive.mapjoin.localtask.max.memory.usage</name>
  15.     <value>0.90</value>
  16. </property>