Hi,
When I connect to C* with driver, I found some warnings in the log (I increased tombstone_failure_threshold to 150000 to see the warning) WARN [ReadStage:5] 2015-01-13 12:21:14,595 SliceQueryFilter.java (line 225) Read 34188 live and 104186 tombstoned cells in system.schema_columns (see tombstone_warn_threshold). 2147483387 columns was requested, slices=[-], delInfo={deletedAt=-9223372036854775808, localDeletion=2147483647} WARN [ReadStage:5] 2015-01-13 12:21:15,562 SliceQueryFilter.java (line 225) Read 34209 live and 104247 tombstoned cells in system.schema_columns (see tombstone_warn_threshold). 2147449199 columns was requested, slices=[-], delInfo={deletedAt=-9223372036854775808, localDeletion=2147483647} I run the command: nodetool compact system But the tombstone number does not decrease. I still see the warnings with the exact number of tombstones. Why is this happening? What should I do to remove the tombstones in the system keyspace?