> a) It is a major compaction [1]
> b) The old version was deleted/overwritten more than GCGraceSeconds ago [2]
c) and the memtable containing the delete/overwrite has been flushed.
(I suppose that's kinda obvious in retrospect, but it took me a little
bit to realize this was why a 'nodetool comp
On 8/6/10 2:13 PM, Benjamin Black wrote:
Assuming the old version is already on disk in an SSTable, the new
version will not overwrite it, and both versions will be in the
system. A compaction will remove the old version, however.
To be clear, a compaction will only remove the old version if :
If you want to be able to get the data over time, you need to store it
in multiple columns. You can use TimeUUID columns if you need to be
able to get ranges of times through queries.
-Original Message-
From: Maifi Khan [mailto:maifi.k...@gmail.com]
Sent: Friday, August 06, 2010 2:51 PM
On Fri, Aug 6, 2010 at 12:51 PM, Maifi Khan wrote:
> Hi
> I have a question about the internal of cassandra write.
> Say, I already have the following in the database -
> (row_x,col_y,val1)
>
> Now if I try to insert
> (row_x,col_y,val100), what will happen?
> Will it overwrite the old data?
> I m
