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Data growth is abnormal

Merry Christmas

The Cassandra cluster 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.

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.