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