Question

The Cassandra API supports batch mutations:

batch_mutate(keyspace, mutation_map,
consistency_level): Executes the
specified mutations on the keyspace.
mutation_map is a map>>; the
outer map maps the key to the inner
map, which maps the column family to
the Mutation; can be read as: map>>. To be more specific,
the outer map key is a row key, the
inner map key is the column family
name. A Mutation specifies either
columns to insert or columns to
delete. See Mutation and Deletion
above for more details.

Are all mutations that are executed in a batch executed atomically? So if one of the mutations fails, do the others fail too?

Answer 1

Everything associated w/ a given key is atomic (which is why batch_mutate allows multiple CFs w/ a single key).