I am a newbie in cassandra. I have asked this question on various platforms but
never got a satisfying answer.
Hence thought of bringing up the topic here. Sorry for this might be a simple
question.
1. I studied the paper on consistent hashing (which is being implemented in
Cassandra)
2. Cassandra has the concept of Vnodes. The vnodes( As I understand a Vnode is
a collection of Hashes) , are the basic blocks of replication in cassandra. It
is the vnodes which are replicated across the cluster. Please do correct me I'm
wrong
3. Suppose I have a Keyspace A with replication factor 3 and Keyspace B with
replication factor 2.
4. Is it that a Vnode is a collection of hashes of data from various Keyspaces.
5. In that case, Keyspace with varying replication factors , replicating them
to other nodes would be a problem
6. Now from the consistent hashing paper, I get a feeling that , ach Keyspace
has a different ring. Also the name "KEYSPACE", points to a ring of keys in the
ring.
So is it that each keyspace has a different ring. If it is so, everything
else like replicating vnodes among nodes in the cluster would fall in place.
Each Keyspace has a different ring ---> each Vnode has data of various
tables from a given keyspace----> hence copies equal to RF is only made in the
cluster.
I know I am missing something. This way of understanding thing might be wrong.
Kindly help me understand the same. As this would help me visualise repair,
bootstrap, adding cluster, streaming operations in a much better way.
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