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The "MemtableSSTable" page has been changed by JonathanEllis. http://wiki.apache.org/cassandra/MemtableSSTable?action=diff&rev1=7&rev2=8 -------------------------------------------------- SSTables that are obsoleted by a compaction are deleted asynchronously when the JVM performs a GC. You can force a GC from jconsole if necessary but this is not necessary; Cassandra will force one itself if it detects that it is low on space. A compaction marker is also added to obsolete sstables so they can be deleted on startup if the server does not perform a GC before being restarted. - CFStoreMBean exposes sstable space used as getLiveDiskSpaceUsed (only includes size of non-obsolete files) and getLiveDiskSpaceUsed (includes everything). + CFStoreMBean exposes sstable space used as getLiveDiskSpaceUsed (only includes size of non-obsolete files) and getTotalDiskSpaceUsed (includes everything). (The high-level memtable/sstable design as well as the "Memtable" and "SSTable" names come from Cassandra's sections 5.3 and 5.4 of [[http://labs.google.com/papers/bigtable.html|Google's Bigtable paper]], although some of the terminology around compaction differs.)
