Donald Smith created CASSANDRA-8990:
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Summary: Allow clients to override the DCs the data gets sent to,
per write request, overriding keyspace settings
Key: CASSANDRA-8990
URL: https://issues.apache.org/jira/browse/CASSANDRA-8990
Project: Cassandra
Issue Type: New Feature
Reporter: Donald Smith
Currently each keyspace specifies how many replicas to write to each data
center. In CQL one specifies:
{noformat}
WITH replication = {
'class': 'NetworkTopologyStrategy',
'DC1: '3',
'DC2': '3'
}
{noformat}
But in some use cases there's no need to write certain rows to a certain
datacenter. Requiring the user to create two keyspaces is burdensome and
complicates code and queries.
For example, we have global replication of our data to multiple continents. But
we want the option to send only certain rows globally with certain values for
certain columns -- e.g., only for users that visited that country).
Cassandra and CQL should support the ability of client code to specify, on a
per request basis, that a write should go only to specified data centers.
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