Tombstone eviction

I was reading durable delete and came across this statement. " Tombstones take up RAM and disk space, they never expire and thus can never be evicted". What does this means ??? Tombstones will grow and never get evicted and expired ???

Tombstones are cleared by the tomb-raider thread when 3 conditions are satisfied 1- there is no previous version of the record still on disk (ie all previously used space by these record versions has been overwritten by new write blocks), 2 - no migrations are going on, 3 - the tombstone has been around beyond its configured minimum life (default is one day - can be changed dynamically).

© 2015 Copyright Aerospike, Inc. | All rights reserved. Creators of the Aerospike Database.