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How'd replication work if I enable rackawareness with Only one rack?

How'd replication work if I enable rackawareness with Only one rack?

I have seen the document https://community.hortonworks.com/articles/43057/rack-awareness-1.html and it's really helpful understanding how replication works if enabling rack-awareness But in the case, it's talking about three racks.

What if we only set 1 rack (or 2 racks) in the cluster?

I am very curious how'd it work if there are less 3 three racks in the cluster.

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