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Update serf to pick up graceful leave fix #4278
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I'm confused by this comment -- how can there be 99.9% of nodes in a 10 node cluster? (either 90% or 100%?)
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That serf simulator is based on a convergence factor calculated with logarithmic scale that never reaches 100%, so I didn't round it up for the comment. In practice, for such a small cluster (10 nodes), this means all nodes will converge with this value.
In a 100K node cluster, 99.9% is 99900 nodes, so the fact that its 99.9% and not 100% matters.