Uh-oh, I was thinking again...
When a node N1 changes the DataSource of DataSend D1, it encourages
other nodes receiving that DataSend to route future DataSends for keys
close to D1's to node N1. If your node has lots of free cache, it's
probably a good idea to encourage this sort of thing -- but you want
to back off quickly, because these advertisements are going to last a
while, and you don't want the node to overfill.
Therefore, I propose that the chances of the DataSource in a DataSend
being changed be something like
1 in 4 + 30 * sqrt(currentDataStoreSize/totalDataStoreSize)
Under this regime, the chances of a change are as follows:
size probability
0% 1 in 4
10% 1 in 13
25% 1 in 19
50% 1 in 25
75% 1 in 30
99% 1 in 34
Thus, for the most part, nodes behave like they currently do, but when
they are near empty, they are much more aggressive about changing the
DataSource.
Does this sound reasonable?
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