A) Which type of tombstone occupies less memory
B) Which type of tombstone will have high performance issue
Types of tombstones Cell Row Range Partition TTL ComplexColumn
I have to admit your question doesn't make sense to me. Tombstones are deletion markers -- they mark a cell, row, range or partition as deleted.
Tombstones don't have an intrinsic "size" so one type does not occupy more memory compared to another. What matters is how many tombstones there are.
For details, see What are tombstones in Cassandra?. Cheers!
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