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From Christof Bornhoevd <>
Subject Atomic Operations in Cassandra
Date Wed, 07 Dec 2011 23:57:27 GMT
Hi All,

I'm using Cassandra 1.0.3 (with Hector 0.7). What is the granularity of
atomic read and write operations with Cassandra. I.e. is the insert or
update of an individual column an atomic operation (in the sense that it
either fails or persists completely), or is the insert or update of an
entire row in a ColumnFamily atomic?

Similarly, if I read multiple columns of the same row, could the read
operation interfere with a concurrent write operation on these same columns
in a way that I might see some old and some new column values?

Cheers and thanks a lot for any kind help on this!

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