On Mon, Oct 24, 2011 at 6:26 PM, Rene Kochen <rene.koc...@emea.schange.com> wrote: > What is the difference between these JMX column family attributes: > > > > TotalDiskSpaceUsed and LiveDiskSpaceUsed
Prior to Cassandra 1.0, obsolete data files (compacted ones) were not deleted right away, but potentially quite some times after they become obsolete. In that setting, TotalDiskSpaceUsed represents the total of the space used by sstables (live *and* obsolete waiting to be deleted) while LiveDiskSpaceUsed was only the live ones. In 1.0, obsolete data files are deleted as soon as they are not needed anymore, so those two attributes should be essentially the same, we just haven't merged them yet (though there is a few situations (with mmap on non-sun jvm) where data file may still take some time to be deleted, so we may keep the two settings for some times). -- Sylvain > > > > Thanks! > > > > Rene
