What's the meaning of the
frozen keyword in Cassandra?
I'm trying to read this documentation page: Using a user-defined type, but their explanation for the
frozen keyword (which they use in their examples) is not clear enough for me:
To support future capabilities, a column definition of a user-defined or tuple type requires the frozen keyword. Cassandra serializes a frozen value having multiple components into a single value. For examples and usage information, see "Using a user-defined type", "Tuple type", and Collection type.
I haven't found any other definition or a clear explanation for that in the net.
1 Answer 1
In Cassandra if you define UDT or Collection as frozen, you can't update UDT's or collection's individual item, you have to reinsert with full value.
A frozen value serializes multiple components into a single value. Non-frozen types allow updates to individual fields. Cassandra treats the value of a frozen type as a blob. The entire value must be overwritten.
@Alon : "Long story short: frozen = immutable"