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From yue.zhang <yue.zh...@chinacache.com>
Subject why the performance of counter is so bad ?
Date Thu, 27 Jun 2013 01:33:59 GMT
env

------

3 node, every node has 8core CPU、32GB memory and 2*1TB disk

centos 5 64bit cassandra 1.2.5 opscenter3.1



my scenario

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each node has a client program,  each client start 10 thread for increasing counter.

the replica=2, and other is defaut value.

my data model
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rowkey: <date>_<domain>_<5min index(1-288)>, value have two cf :  IN:<value>
and OUT:<value>
e.g. 20130503_www.facebook_24: IN:2342134, OUT:2423234

result
---------
everything is ok but the performance. from opscenter, the writers is only 6000/sec.

somebody tell me is normal situation. if not ,how to improve it.

P.S. CPU idle is greater than 60%, the load only 1.x(8core cpu) , and the memroy only use
50%.

thx
-heipark
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