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From Rodrigo Felix <rodrigofelixdealme...@gmail.com>
Subject nodetool ring showing different 'Load' size
Date Mon, 17 Jun 2013 15:33:13 GMT
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 CearĂ¡
Project Manager
MBA, CSM, CSPO, SCJP

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