amplab/tachyon — pull request #213 by rootfs (2014-06-10 18:57:27+00:00)
Title: Refactor configuration class

Current configuration is based on system properties. This results in a long command line string, hard to customize and change dynamically.

This pull adds a new configuration class using configuration file, the same way as Hadoop has with its core-site.xml.

For compatibility, both system property and xml configurations are supported. The overwrite order is system > file. This is also inspired by what SPARK does (thanks to Haoyuan's pointer).