Let's say I have 10 nodes, I add 5 more, if I fail to run nodetool cleanup,
is excessive data transferred when I add the 6th node?  IE do the existing
nodes send more data to the 6th node?

the documentation is unclear.  It sounds like the biggest problem is that
the existing data causes things to become unbalanced due to "load" computed
wrong".

but I also think that the excessive data will be removed in the next major
compaction and that nodetool cleanup just triggers a major compaction.

Is my hypothesis correct?

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