> Sometimes the rsync algorithm gets collisions between block digests > (ie: two different blocks actually have the same digest) so the wrong > block is used. The causes the overall md4 checksum to fail. A second > pass is used with larger (stronger) block digests, and the file will > be transferred correctly in the second phase. The only impact is an > increase in transfer time for the second phase. > > In more recent rsync protocol versions, the first pass digest > length is dynamic, reducing the chance of this happening. but > File::RsyncP 0.52 doesn't support this. The next version will. >
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