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Data growth is abnormal

Merry Christmas

The Cassandra cluster(3.11.3) I operate consists of two datacenters.

Most data has a TTL of 14 days and stores one data for each data center. (NetworkTopologyStrategy, datacenter1: 1, datacenter2: 1)

However, for a few days ago, only the datacenter1 disk usage is increasing rapidly. (current 9.3TB vs 7.7TB)

There is no change in nodetool cleanup on each node of datacenter1.

How does this happen? What can I do?

I would appreciate your advice.

Thank you in advance.
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