I am using a cluster with 3 nodes and the cassandra version is 3.0.9. I have used it about 6 months. Now each node has about 1.5T data in the disk. I found some sstables file are over 300G. Using the sstablemetadata command, I found it: Estimated droppable tombstones: 0.9622972799707109. It is obvious that too much tombstone data exists. The default_time_to_live = 8640000(100 days) and gc_grace_seconds = 432000(5 days). Using nodetool compactionstats, I found the some compaction processes exists. So I really want to know how to clear tombstone data ? otherwise the disk space will cost too much. I really need some help, because some few people know cassandra in my company. Thank you very much!
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