Bill writes:

> 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

The thing is, in a mature network I would suppose that most nodes
will stay pretty full.  We only delete files when other ones overfill
the store.  So in practice there won't be much variance in probability
and this won't have much effect.  It is true that this proposal might
cause new nodes to fill up sooner, but it remains to be seen whether
slow filling of new nodes is a problem.  At this point it looks to me
like a solution which we don't need.

Hal

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