Implement "check and set"
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Key: CASSANDRA-1984
URL: https://issues.apache.org/jira/browse/CASSANDRA-1984
Project: Cassandra
Issue Type: New Feature
Reporter: Max Sanders
Fix For: 0.7.1
When fetching data from cassandra you should ask for a hash value for the
stored value. Then when updating a value it should be possible to submit this
hash value and only update the data when the hash key is still the same.
This way you can be sure that the data was not changed on this node.
It is the same as the memcached CAS Feature.
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