mapred-site.xml - change local dir

//If map output size is too big, the location must be changed.

<property>

<name>mapreduce.cluster.local.dir</name>

<value>/mnt/mapred/local</value>

</property>

<property>

<name>mapreduce.cluster.local.dir</name>

<value>/mnt/mapred/local</value>

</property>

sudo nano /usr/local/hadoop-2.7.1/etc/hadoop/mapred-site.xml