On Sat, Apr 14, 2012 at 4:08 AM, Igor <i...@4friends.od.ua> wrote: > Assume I insert all my data with TTL=2weeks and let we have sstable A which > was created week ago at the time T, so I know that right now it contain: > > 1) some data that were inserted not later than T and may-be not expired yet > 2) some amount of data that were already close to expiration due TTL at the > time T, but still had no chances to be wiped out because up to the current > moment size-tiered compaction did not involve A into compactions. > > Large amount of data from 2) became expired in a week after time T and > probably passed gc_grace period, so it shoould be wiped at any compaction on > table A.
Any compaction pass over A will first convert the TTL data into tombstones. Then, any subsequent pass that includes A *and all other sstables containing rows with the same key* will drop the tombstones. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
