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The "VirtualNodes/Balance" page has been changed by 0track: http://wiki.apache.org/cassandra/VirtualNodes/Balance?action=diff&rev1=7&rev2=8 <<Anchor(imbalance)>> == Imbalance == - By default, a nodes tokens are randomly generated with the expectation that an even distribution of the namespace will result. However, variations of as much as 7% have been reported on small clusters when using the `num_tokens` default of 256. + By default, nodes tokens are randomly generated with the expectation that an even distribution of the namespace will result. However, variations of as much as 7% have been reported on small clusters when using the `num_tokens` default of 256. These randomly generated tokens are MD5 sums, so entropy isn't the problem here, at least not in the sense that using a better RNG would create a more even distribution of ranges. Increasing the token count (either by increasing num_tokens, or the number of nodes) will improve this, (the more tokens, the more the distribution will even out).
