hadoop内存不足

问题
Container killed on request. Exit code is 143

然后提示memory 2.7g in 2.1g used
这里是表示内存不够，所以

修改hadoop/etc/hadoop/mapred.site

<property>
    <name>mapreduce.map.memory.mb</name>
    <value>4096</value>
  </property>
  <property>
    <name>mapreduce.reduce.memory.mb</name>
    <value>4096</value>
  </property>