incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Brayton Thompson <thomp...@grnoc.iu.edu>
Subject Load Vs Disk Space Usage
Date Thu, 18 Nov 2010 20:50:52 GMT
We're playing around with Cassandra trying to get a feel for it. Can someone please explain
the difference between load (from nodetool) and whats actually stored on disk? Sometimes these
number mirror each other and sometimes the disk usage is up to 2x the load reported. as you
can see below...

Cassandra 1	Keyspace Data Dir. Size (MB)	System Data Dir Size (MB)	Commit Log Data Dir Size
(MB)	Load (reported by ring) (MB)
Initial	0	0.11	0.03	0.04
Run 1	254	0.11	344	253.23
Run 2	634	0.11	302	632.84
Run 3	1500	0.11	260	1012.46
Run 4	1400	0.11	219	1360
Run 5	2200	0.11	305	1610
Run 6	4000	0.11	264	1980
Run 7	2400	0.11	350	2350
Run 8	2800	0.11	309	2720
Run 9	3600	0.11	267	3090
Run 10	3400	0.11	354	3340
Run 11	3800	0.11	312	3710
Run 12	6100	0.11	271	4080
Run 3,5,6,9, and 12 don't seem to match up well. Can someone explain this please?

Thank you.
Mime
View raw message