Thanks Eric. Is there a way to start manually compaction operations? I'm thinking about doing after loading data and before start run phase of the benchmark. Thanks.
Att. *Rodrigo Felix de Almeida* LSBD - Universidade Federal do Ceará Project Manager MBA, CSM, CSPO, SCJP On Mon, Jun 17, 2013 at 12:41 PM, Eric Stevens <migh...@gmail.com> wrote: > 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 >> > >
