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The "FAQ" page has been changed by TylerHobbs: http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=154&rev2=155 Comment: gc_grace is now in the schema, not schema.xml <<Anchor(i_deleted_what_gives)>> == I delete data from Cassandra, but disk usage stays the same. What gives? == - Data you write to Cassandra gets persisted to SSTables. Since SSTables are immutable, the data can't actually be removed when you perform a delete, instead, a marker (also called a "tombstone") is written to indicate the value's new status. Never fear though, on the first compaction that occurs after ''GCGraceSeconds'' (hint: storage-conf.xml) have expired, the data will be expunged completely and the corresponding disk space recovered. See DistributedDeletes for more detail. + Data you write to Cassandra gets persisted to SSTables. Since SSTables are immutable, the data can't actually be removed when you perform a delete, instead, a marker (also called a "tombstone") is written to indicate the value's new status. Never fear though, on the first compaction that occurs after `gc_grace_seconds` (configurable per-column family as part of the schema) have passed, the data will be expunged completely and the corresponding disk space recovered. See DistributedDeletes for more detail. <<Anchor(cloned)>>
