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From Apache Wiki <wikidi...@apache.org>
Subject [Cassandra Wiki] Trivial Update of "MemtableSSTable" by JonathanEllis
Date Tue, 20 Apr 2010 17:55:17 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

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.)
  

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