presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/AccumuloConnector.java/AccumuloConnector/rollback
class AccumuloConnector:    @Override
    public void rollback(ConnectorTransactionHandle transactionHandle)
    {
        AccumuloMetadata metadata = transactions.remove(transactionHandle);
        checkArgument(metadata != null, "no such transaction: %s", transactionHandle);
        metadata.rollback();
    }