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The "StarDelta" page has been changed by StefanFuhrmann: http://wiki.apache.org/subversion/StarDelta?action=diff&rev1=5&rev2=6 FSFS currently uses xdelta to store different version of the same node efficiently. Basically, we represent node $$x_i$$ as - x_i = x_i-1 o \delta(x_i, x_i-1) + $$x_i = x_i-1 o \delta(x_i, x_i-1)$$ x_i-1 = x_i-2 o \delta(x_i-1, x_i-2) ... x_0 = x_0
