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The "FAQ" page has been changed by JonathanEllis. The comment on this change is: link DistributedDeletes. http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=37&rev2=38 -------------------------------------------------- <<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. + 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. <<Anchor(reads_slower_writes)>> == Why are reads slower than writes? ==
