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From Mike Gallamore <>
Subject Re: History values
Date Wed, 14 Apr 2010 15:49:30 GMT
Here here on documentation.

For example thrift examples in python and java. That is great but I've 
never coded in either (and am limited to perl or C at work because when 
have 5 years worth of code and experience with other modules provided 
for those languages). So I'm stuck with whatever the person who makes 
the module I chose to use gives for documentation. However that isn't 
always great, especially in my view particularly for perl. Often you get 
10 lines of example code and if you are lucky (and often you are not) a 
listing of the methods the module provides and what they do. It seems 
often in perl people expect you to look through the source to see if 
their is a method you should call to do something which I think is 
unreasonable (how do I know if at start up I'm supposed to use new, 
connect, auto-connect etc with no comments and no examples?). I'm open 
to helping out with documentation but my problem is that my learning 
process is slow because their is little documentation and once I figure 
something out it was by trial and error, so I don't even know if how I 
do it is the right way to do it, just that it works. Not ideal.
On 04/14/2010 03:09 AM, aXqd wrote:
> On Wed, Apr 14, 2010 at 5:13 PM, Zhiguo Zhang<>  wrote:
>> I think it is still to young, and have to wait or write your self the
>> "graphical console", at least, I don't find any until now.
> Frankly speaking, I'm OK to be without GUI...But I am really
> disappointed by those so-called 'documents'.
> I really prefer to have some more documents in real 'English' and in a
> more tutorial way.
> Hope I can write some texts after I managed to understand the current ones.
>> On Wed, Apr 14, 2010 at 10:04 AM, Bertil Chapuis<>  wrote:
>>> I'm also new to cassandra and about the same question I asked me if using
>>> super columns with one key per version was feasible. Is there limitations to
>>> this use case (or better practices)?
>>> Thank you and best regards,
>>> Bertil Chapuis
>>> On 14 April 2010 09:45, Sylvain Lebresne<>  wrote:
>>>>> I am new to using cassandra. In the documentation I have read,
>>>>> understand,
>>>>> that as in other non-documentary databases, to update the value of a
>>>>> key-value tuple, this new value is stored with a timestamp different
>>>>> but
>>>>> without entirely losing the old value.
>>>>> I wonder, as I can restore the historic values that have had a
>>>>> particular
>>>>> field.
>>>> You can't. Upon update, the old value is lost.
>>>>  From a technical standpoint, it is true that this old value is not
>>>> deleted (from disk)
>>>> right away, but it is deleted eventually by compaction (and you don't
>>>> really control
>>>> when the compactions occur).
>>>> --
>>>> Sylvain

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