/**
* A cohort proxy implementation for a single-shard transaction commit. If the transaction was a direct commit
* to the shard, this implementation elides the CanCommitTransaction and CommitTransaction messages to the
- * shard as an optimization. Otherwise the 3-phase commit to the shard is delegated to a
- * ThreePhaseCommitCohortProxy instance (this is for backwards compatibility with pre-Lithium versions).
+ * shard as an optimization.
*
* @author Thomas Pantelis
*/