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From Felipe Schmidt <felipef...@gmail.com>
Subject Re: Retrieving old data version for a given row
Date Mon, 14 May 2012 09:50:00 GMT
Yes, I need this information just for academic purposes.

So, to read old data values, I tried to open the Commitlog using tail
-f and also the log files viewer of Ubuntu, but I can not see many
informations inside of the log!
Is there any other way to open this log? I didn't find any Cassandra
API for this purpose.

Thanks averybody in advance.

Regards,
Felipe Mathias Schmidt
(Computer Science UFRGS, RS, Brazil)




2012/5/14 zhangcheng2 <zhangcheng2@software.ict.ac.cn>:
> After compaciton, the old version data will gone!
>
> ________________________________
> zhangcheng2
>
> From: Felipe Schmidt
> Date: 2012-05-14 05:33
> To: user
> Subject: Retrieving old data version for a given row
> I'm trying to retrieve old data version for some row but it seems not
> be possible. I'm a beginner  with Cassandra and the unique aproach I
> know is looking to the SSTable in the storage folder, but if I insert
> some column and right after insert another value to the same row,
> after flushing, I only get the last value.
> Is there any way to get the old data version? Obviously, before compaction.
>
> Regards,
> Felipe Mathias Schmidt
> (Computer Science UFRGS, RS, Brazil)
>

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