abstract ShardDataTreeCohort finishTransaction(ReadWriteShardDataTreeTransaction transaction);
abstract ShardDataTreeCohort createReadyCohort(TransactionIdentifier id, DataTreeModification mod);
abstract ShardDataTreeCohort finishTransaction(ReadWriteShardDataTreeTransaction transaction);
abstract ShardDataTreeCohort createReadyCohort(TransactionIdentifier id, DataTreeModification mod);