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From Lanny Ripple <>
Subject Decommission an entire DC
Date Tue, 23 Jul 2013 19:32:46 GMT

We have a multi-dc setup using DC1:2, DC2:2.  We want to get rid of DC1.
 We're in the position where we don't need to save any of the data on DC1.
 We know we'll lose a (tiny.  already checked) bit of data but our
processing is such that we'll recover over time.

How do we drop DC1 and just move forward with DC2?  Using nodetool
decommision or removetoken looks like we'll eventually end up with a single
DC1 node containing the entire dc's data which would be slow and costly.

We've speculated that setting DC1:0 or removing it from the schema would do
the trick but without finding any hits during searching on that idea I
hesitate to just do it.  We can drop DC1s data but have to keep a working
ring in DC2.

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