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From Lucas Benevides <lu...@maurobenevides.com.br>
Subject Cassandra stress tool - data generation
Date Wed, 01 Nov 2017 16:38:21 GMT
Dear community,

I am using Cassandra Stress Tool and trying to simulate IoT generated data.
So I created a column family with the device_id as the partition key.

But in every different operation (the parameter received in the -n option)
the generated values are the same. For instance, I have a column called
observation_time which is supposed to be the time measured by the sensor.
But in every partition the values are equal.

Is there a way to make those values be randomically generated with
different seeds? I need this way so that if the same device_id occurs
again, it makes an INSERT instead of an UPSERT.

To clarify: What is happening now (fictional data):

operation 1
device 1
ts1: 01/01/1970
ts2: 02/01/1980
ts3: 03/01/1990

operation 2
device 2
ts1: 01/01/1970
ts2: 02/01/1980
ts3: 03/01/1990

What I want:
operation1
device 1
ts1: 01/01/1970
ts2: 02/01/1980
ts3: 03/01/1990

operation2
device 2
ts1: 02/01/1971  #Different values here.
ts2: 05/01/1982
ts3: 08/01/1993

Thanks in advance,
Lucas Benevides

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