2.6. Problem: yum Fails on Free Disk Space Check

If you boot your Hadoop DataNodes with/as a ramdisk, you must disable the free space check for yum before doing the install. If you do not disable the free space check, yum will fail with the following error:

Fail: Execution of '/usr/bin/yum -d 0 -e 0 -y install unzip' returned 1. Error Downloading Packages: unzip-6.0-1.el6.x86_64: Insufficient space in download directory /var/cache/yum/x86_64/6/base/packages
    * free   0
    * needed 149 k

 2.6.1. Solution:

To disable free space check, update the DataNode image with a directive in /etc/yum.conf: