Thanh created CASSANDRA-12208:
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Summary: Estimated droppable tombstones given by sstablemetadata
counts tombstones that aren't actually "droppable"
Key: CASSANDRA-12208
URL: https://issues.apache.org/jira/browse/CASSANDRA-12208
Project: Cassandra
Issue Type: Bug
Reporter: Thanh
Priority: Minor
=> "Estimated droppable tombstones" given by *sstablemetadata* counts
tombstones that aren't actually "droppable"
To be clear, the "Estimated droppable tombstones" calculation counts tombstones
that have not yet passed gc_grace_seconds as droppable tombstones, which is
unexpected, since such tombstones aren't droppable.
To observe the problem:
Create a table using the default gc_grace_seconds (default gc_grace_seconds is
86400 is 1 day).
Populate the table with a couple of records.
Do a delete.
Do a "nodetool flush" to flush the memtable to disk.
Do an "sstablemetadata <sstable>" to get the metadata of the sstable you just
created by doing the flush, and observe that the Estimated droppable tombstones
is greater than 0.0 (actual value depends on the total number
inserts/updates/deletes that you did before triggered the flush)
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