Murmur3 Hash Algorithm Used in Cassandra

Question

I'm trying to reproduce the Murmur3 hashing in Cassandra. Does anyone know how to get at the actual hash values used in the row keys? I just need some key - hash value pairs from my data to check that my implementation of the hashing is correct.

Alex

Answer 1

Ask Cassandra! Insert some data in your table. Afterwards, you can use the token function in a select query to get the used token values. For example:

select token(id), id from myTable;

A composite partition key is serialized as n-times a byte array (that is always prepended with a short indicating its length) containing the serialized value of your key element and a closing 0. It's unclear to me what these closing zeros are for. Has something to do with SuperColumns...