> So you mean just the replica node 's sstable will be changed ,right?

The data will only be written to the nodes that are part of the
replica set fo the row (with the exception of hinted handoff, but
that's a different sstable).

> If all the replica node broke down, whether the users can read the data?

If *all* nodes in the replica set for a particular row are down, then
you won't be able to read that row, no.

-- 
/ Peter Schuller

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