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From Jonathan Ellis <>
Subject Re: Does Cassandra use vector clocks
Date Wed, 23 Feb 2011 17:27:21 GMT
On Wed, Feb 23, 2011 at 9:57 AM, Oleg Anastasyev <> wrote:
> From the other hand, the same article says:
> "For conditional writes to work, the condition must be evaluated at all update
> sites before the write can be allowed to succeed."
> This means, that when doing such an update CL=ALL must be used.


> This could be a
> bearable price to pay for conflict detection.

IMO if you only get CL.ALL it's not superior enough to pessimistic
locking to justify the complexity of adding it.

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

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