Same, also I'd love to know more about the technical details of their logging format, the on-disk storage format, and why they were only able to reduce the storage size to 20% of the uncompressed size. For example, clp[1] can achieve much, much better compression on logs data.
[1] https://github.com/y-scope/clp
EDIT: See also[2][3].
[2] https://www.uber.com/blog/reducing-logging-cost-by-two-order...
[3] https://www.uber.com/blog/modernizing-logging-with-clp-ii/