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From Jonathan Ellis <>
Subject Re: more questions on Cassandra ACID properties
Date Tue, 20 Jul 2010 21:02:25 GMT
On Tue, Jul 20, 2010 at 2:58 PM, Alex Yiu <> wrote:
> Say, I have a row that has 3 columns already: colA, colB and colC
> And, if two *concurrent* clients perform a different insert(...) into the
> same row,
> one insert is for colD and the other insert is for colE.
> Then, Cassandra would guarantee both columns will be added to the same row.
> Is that correct?


> That is, insert(...) of a column does NOT involving reading and rewriting
> other existing columns of the same row?


> If that is the case, I guess we should change the wording from "insert" to
> "insert or update" in the wiki doc

That would be a good change.  (Click "Login" to create an account.)

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

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