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From "tijoriwala.ritesh" <>
Subject Re: New Chain for : Does Cassandra use vector clocks
Date Thu, 24 Feb 2011 08:46:32 GMT

If it cannot protect against lost updates, isn't that an issue? How is client
support to protect against concurrency? I see lot of users mentioning the
use of cages (i.e. use ZooKeeper) but involving locks on every writes at the
application level is certainly not acceptable. And again, the application
will end up using vector clocks anyways. IMHO, this support should be built
into cassandra especially when it provides all the knobs to the client to
choose the right consistency level. So if client chooses R + W > N, then it
should be possible for Cassandra to detect conflicts.
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