Carlo,

Do you read/write with the consistency levels according to your needs [1]? 

Have you tried to see if it happens when using the cassandra-cli to get that data?
 

[1] http://wiki.apache.org/cassandra/ArchitectureOverview


On Wed, Jul 24, 2013 at 5:34 PM, cbertu81@libero.it <cbertu81@libero.it> wrote:
Hi all,
I know the subject is not saying much but this is what I'm experiencing now
with my cluster.
After some years without any problem now I'm experiencing problems with
counters but, the most serious problem, is data loss immediately after a read.

I have some webservices that I use to query data on Cassandra but in the last
month happened 2 times the following problem: I call my WS, it shows data. I
refresh the page -- data are no more available! I can call then 200 times the
WS but I won't see data anymore ... today my colleague experienced the same
problem. The WS are ABSOLUTELY read only on the DB and there are no write to
erase these data. Anyone understand wth is going on? I have no idea but most of
all I don't know how to fix.

Any help would really be appreciated.

Kind Regards,
Carlo