Load is the size of the storage on disk as I understand it. This can fluctuate during normal usage even if records are not being added or removed, a node's load may be reduced during compaction for example. During compaction, especially if you use Size Tiered Compaction strategy (the default), load may temporarily double for a column family.
On Mon, Jun 17, 2013 at 11:33 AM, Rodrigo Felix < rodrigofelixdealme...@gmail.com> wrote: > Hi, > > I've been running a benchmark on Cassandra and I'm facing a problem > regarding to the size of the database. > I performed a load phase and then, when running nodetool ring, I got > the following output: > > *ubuntu@domU-12-31-39-0E-11-F1:~/cassandra$ bin/nodetool ring * > *Address DC Rack Status State Load > Effective-Ownership Token * > * > 85070591730234615865843651857942052864 * > *10.192.18.3 datacenter1 rack1 Up Normal 2.07 GB > 50.00% 0 * > *10.85.135.169 datacenter1 rack1 Up Normal 2.09 GB > 50.00% 85070591730234615865843651857942052864* > > After that I executed, for about one hour, a workload with scan and > insert queries. Then, after finishing the workload execution, I run again > nodetool ring and got the following: > > *ubuntu@domU-12-31-39-0E-11-F1:~/cassandra$ bin/nodetool ring * > *Address DC Rack Status State Load > Effective-Ownership Token * > * > 85070591730234615865843651857942052864 * > *10.192.18.3 datacenter1 rack1 Up Normal 1.07 GB > 50.00% 0 * > *10.85.135.169 datacenter1 rack1 Up Normal 2.15 GB > 50.00% 85070591730234615865843651857942052864* > > Any idea why a node had its size reduced if no record was removed? No > machine or added or removed during this workload. > Is this related to any kind of compression? If yes, is there a command > to confirm that? > I also faced a problem where a node has its size increased from about > 2gb to about 4gb. In this last scenario, I both added and removed nodes > during the workload depending on the load (CPU). > Thanks in advance for any help. > > > Att. > > *Rodrigo Felix de Almeida* > LSBD - Universidade Federal do Ceará > Project Manager > MBA, CSM, CSPO, SCJP >
