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memtable:
  class: SkipListMemtable

Alternatively, to support the need for per-node configuration (e.g. to better optimize heterogeneous deployments, or to test a memtable implementation switch on a small set of nodes), the API can be configured using templates specified in cassandra.yaml, for example:

memtable_templates:
    trie:
        class: TrieMemtable
        shards: 16
    skiplist:
        class: SkipListMemtable
memtable:
    template: skiplist

(which defines two templates and specifies the default memtable implementation to use) to cassandra.yaml and specifying  WITH memtable = {'template' : 'trie'} in the table definition.

The initial implementation may leave existing memtable configuration parameters (memory mode, memory size limits and flush thresholds, expiration time) as top-level parameters in the yaml, with the expectation that they will be gradually replaced with memtable-specific ones and deprecated.

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