mac 运行hadoop出现 Error: Java heap space

问题:

Error: Java heap space

解决方案:

• 编辑文件 /usr/local/Cellar/hadoop/2.7.3/libexec/etc/hadoop/mapred-site.xml 添加 Xmx4096m

<configuration>
  <property>
    <name>mapred.child.java.opts</name>
    <value>-Xmx4096m</value>
  </property>
</configuration>

• 或者在运行hadoop之前 export HADOOP_OPTS="-Xmx4096m"

• 或者对Hadoop 2+, 修改 mapreduce.map.java.opts

参考文档

• http://stackoverflow.com/questions/15609909/error-java-heap-space?answertab=active#tab-top

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