id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
214	use zsync to update offline routing data	Martin Kolman	Martin Kolman	"* use zsync to update routing data from the server
* like this, only changes would be transferred, making frequent routing data updates feasible
 * packs for large countries can take up multiple GBs

* zsync: http://zsync.moria.org.uk/

* drawbacks:
* needs to store two copies of the routing data
  * one archive for direct download
  * one in uncompressed form + zsync control file for updates only
   * needs zsync files for all files
   * on the other hand as zsync won't overwrite the file until the download is finished, working on multiple smaller files helps
 "	enhancement	new	minor		gps