The only way you could get the old value for a column would be to insert
the column value, then flush, then insert the new column, then before
compaction look at the old sstable.
If you insert the value twice in a row without a flush, the old value is
gone, as it only exists in memtables (and in the commit log - of course).
Hopefully you want this information for learning purposes only, and
aren't actually using this for real purposes.
On 05/13/2012 05:33 PM, Felipe Schmidt wrote:
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)
