Hadoop执行报Java内存不足错误

Question

• 服务器是一个云服务器，内存为1G，CPU为1核。
  然后执行一个Hadoop本身自带的example报错的。报错信息如下：

  There is insufficient memory for the Java Runtime Environment to continue.

  Native memory allocation (mmap) failed to map 12288 bytes for committing reserved memory.

  执行的命令是：
  hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.5.jar grep /input/hadoop/core-site.xml /user/test1 'dfs[a-z.]+'

Answer 1

free -m看看服务器有没有swap没有的话建议做一个2G的swap文件，毕竟1G内存不是很够用