Need a way of flattening schemas.
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Key: CASSANDRA-2056
URL: https://issues.apache.org/jira/browse/CASSANDRA-2056
Project: Cassandra
Issue Type: Improvement
Reporter: Gary Dusbabek
Assignee: Gary Dusbabek
Fix For: 0.7.2
For all of our trying not to, we still managed to screw this up. Schema
updates currently contain a serialized RowMutation stored as a column value.
When a node needs updated schema, it requests these values, deserializes them
and applies them. As the serialization scheme for RowMutation changes over
time (this is inevitable), those old migrations will become incompatible with
newer implementations of the RowMutation deserializer. This means that when
new nodes come online, they'll get migration messages that they have trouble
deserializing. (Remember, we've only made the promise that we'll be backwards
compatible for one version--see CASSANDRA-1015--even though we'd eventually
have this problem without that guarantee.)
What I propose is a cluster command to flatten the schema prior to upgrading.
This would basically purge the old schema updates and replace them with a
single serialized migration (serialized in the current protocol version).
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