Steps to properly remove a data center so no information is lost.
Steps to properly remove a data center so no information is lost.
Procedure
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Make sure no clients are still writing to any nodes in the data center.
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Run a full repair with nodetool
repair.
This ensures that all data is propagated from the data center being
decommissioned.
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Change all keyspaces so they no longer
reference the data center being removed.
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Run nodetool decommission on
every node in the data center being removed.