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From Radim Kolar <>
Subject Re: questions on frequency and timing of async replication between DCs
Date Tue, 15 Nov 2011 07:27:08 GMT

> It may be the case that your CL is the issue. You are writing it at
> ONE, which means that out of the 4 replicas of that key (two in each
> data center), you are only putting it on one of them.
cassandra will always try to replicate key to all available replicas. 
Under normal conditions if you do write + wait about 1 sec + then read 
at CL.ONE you should get back correct value. Consistency in cassandra is 
not problem in real world, its way better then SQL databases with async 
replication. Make sure you have your clients clock synced via NTP,

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