A little addendum Key := Your data to identify a row Token := Index on the ring calculated from Key. The calculation is defined in replication strategy.
You can lookup responsible nodes (endpoints) for a specific key with JMX getNaturalEndpoints interface. maki 2011/6/24 aaron morton <aa...@thelastpickle.com>: > Various places in the code call IPartitioner.decorateKey() which returns a > DecoratedKey<T> which contains both the original key and the Token<T> > > The RandomPartitioner md5 to hash the key ByteBuffer and create a BigInteger. > OPP converts the key into utf8 encoded String. > > Using the token to find which endpoints contain replicas is done by the > AbstractReplicationStrategy.calculateNaturalEndpoints() implementations. > > Does that help? > > ----------------- > Aaron Morton > Freelance Cassandra Developer > @aaronmorton > http://www.thelastpickle.com > > On 23 Jun 2011, at 19:58, Jonathan Colby wrote: > >> Hi - >> >> I'd like to understand more how the token is hashed with the key to >> determine on which node the data is stored - called decorating in cassandra >> speak. >> >> Can anyone share any documentation on this or describe this more in detail? >> Yes, I could look at the code, but I was hoping to be able to read more >> about how it works first. >> >> thanks. > > -- w3m
