- - A new incremental-recursion algorithm is now used when rsync is talking
- to another 3.0.0 version. This starts the transfer going more quickly
- (before all the files have been found), and requires much less memory.
- See the --recursive option in the manpage for some restrictions.
-
- - The default --delete algorithm is now --delete-during when talking to a
- 3.x rsync. This is a faster scan than using --delete-before (which is
- the default when talking to older rsync versions), and is compatible
- with the new incremental recursion mode.
-
- - Added the --delete-delay option, which is a more efficient way to
- delete files at the end of the transfer without needing a separate
- delete pass.
-
- - You may specify --max-delete=0 to a 3.0.0 client as long as the
- receiving side is at least version 3.0.0. This means that you
- can pull from an older rsync with this option, but pushing to an
- older rsync will generate an error. *Be sure to never specify a 0
- value to an older rsync client, or it will be silently ignored.*
-
- - The --hard-link option now uses less memory on both the sending and
- receiving side for all protocol versions. For protocol 30, the use
- of a hashtable on the sending side allows us to more efficiently
- convey to the receiver what files are linked together. This reduces
- the amount of data sent over the socket by a considerable margin, and
- moves the in-memory storage of the device+inode information from the
- receiving side (for protocols < 30) to the sending side (note that
- older rsync versions kept the device+inode information on both
- sides).