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From Jonathan Ellis <>
Subject Re: Does the memtable replace the old version of column with the new overwriting version or is it just a simple append ?
Date Wed, 09 Mar 2011 17:12:30 GMT
On Wed, Mar 9, 2011 at 1:56 AM, Aditya Narayan <> wrote:
> so this means that in memtable only the most recent version of a
> column will reside?

The most recent version seen since the memtable was opened, which may
not be the most recent version ever.

> For this implementation, while writing "to
> memtable" Cassandra will see if there are other versions and will
> overwrite them (reconcilation while writing) !?

Only versions in the same memtable.  It doesn't look at versions
already flushed.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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