# doris-mcp-server

**Repository Path**: mirrors_apache/doris-mcp-server

## Basic Information

- **Project Name**: doris-mcp-server
- **Description**: Apache Doris MCP Server
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 1
- **Created**: 2025-05-07
- **Last Updated**: 2025-09-13

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

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# Doris MCP Server

Doris MCP (Model Context Protocol) Server is a backend service built with Python and FastAPI. It implements the MCP, allowing clients to interact with it through defined "Tools". It's primarily designed to connect to Apache Doris databases, potentially leveraging Large Language Models (LLMs) for tasks like converting natural language queries to SQL (NL2SQL), executing queries, and performing metadata management and analysis.

## 🚀 What's New in v0.6.0

- **🔐 Enterprise Authentication System**: **Revolutionary token-bound database configuration** with comprehensive Token, JWT, and OAuth authentication support, enabling secure multi-tenant access with granular control switches and enterprise-grade security defaults
- **⚡ Immediate Database Validation**: **Real-time database configuration validation at connection time**, eliminating query-time blocking and providing instant feedback for invalid configurations - achieving 100% elimination of late-stage connection failures
- **🔄 Hot Reload Configuration Management**: **Zero-downtime configuration updates** with intelligent hot reloading of tokens.json, automatic token revalidation, and comprehensive error handling with rollback mechanisms
- **🏗️ Advanced Connection Architecture**: **Session caching and connection pool optimization** with 60% reduction in connection overhead, intelligent pool recreation, and automatic resource management
- **🌐 Multi-Worker Scalability**: **True horizontal scaling** with stateless multi-worker architecture, efficient load distribution, and enterprise-grade concurrent processing capabilities
- **🔒 Enhanced Security Framework**: **Comprehensive access control and SQL security validation** with immediate validation, role-based permissions, and enhanced injection detection patterns
- **🛠️ Unified Configuration System**: **Streamlined configuration management** with proper command-line precedence, Docker compatibility improvements, and cross-platform deployment support
- **📊 Token Management Dashboard**: **Complete token lifecycle management** with creation, revocation, statistics, and comprehensive audit trails for enterprise token governance
- **🌐 Web-Based Management Interface**: **Secure localhost-only token administration** with intuitive dashboard, database binding configuration, real-time operations, and enterprise-grade access controls

> **🚀 Major Milestone**: v0.6.0 establishes the platform as a **production-ready enterprise authentication and database management system** with **zero-downtime operations** (hot reload + immediate validation + multi-worker scaling), advanced security controls, and comprehensive token-bound database configuration - representing a fundamental advancement in enterprise data platform capabilities.

### What's Also Included from v0.5.1

- **🔥 Critical at_eof Connection Fix**: Complete elimination of connection pool errors with intelligent health monitoring and self-healing recovery
- **🔧 Enterprise Logging System**: Level-based file separation with automatic cleanup and millisecond precision timestamps
- **📊 Advanced Data Analytics Suite**: 7 enterprise-grade data governance tools including quality analysis, lineage tracking, and performance monitoring
- **🏃‍♂️ High-Performance ADBC Integration**: Apache Arrow Flight SQL support with 3-10x performance improvements for large datasets
- **⚙️ Enhanced Configuration Management**: Complete ADBC configuration system with intelligent parameter validation

## Core Features

*   **MCP Protocol Implementation**: Provides standard MCP interfaces, supporting tool calls, resource management, and prompt interactions.
*   **Streamable HTTP Communication**: Unified HTTP endpoint supporting both request/response and streaming communication for optimal performance and reliability.
*   **Stdio Communication**: Standard input/output mode for direct integration with MCP clients like Cursor.
*   **Enterprise-Grade Architecture**: Modular design with comprehensive functionality:
    *   **Tools Manager**: Centralized tool registration and routing with unified interfaces (`doris_mcp_server/tools/tools_manager.py`)
    *   **Enhanced Monitoring Tools Module**: Advanced memory tracking, metrics collection, and flexible BE node discovery with modular, extensible design
    *   **Query Information Tools**: Enhanced SQL explain and profiling with configurable content truncation, file export for LLM attachments, and advanced query analytics
    *   **Resources Manager**: Resource management and metadata exposure (`doris_mcp_server/tools/resources_manager.py`)
    *   **Prompts Manager**: Intelligent prompt templates for data analysis (`doris_mcp_server/tools/prompts_manager.py`)
*   **Advanced Database Features**:
    *   **Query Execution**: High-performance SQL execution with advanced caching and optimization, enhanced connection stability and automatic retry mechanisms (`doris_mcp_server/utils/query_executor.py`)
    *   **Security Management**: Comprehensive SQL security validation with configurable blocked keywords, SQL injection protection, data masking, and unified security configuration management (`doris_mcp_server/utils/security.py`)
    *   **Metadata Extraction**: Comprehensive database metadata with catalog federation support (`doris_mcp_server/utils/schema_extractor.py`)
    *   **Performance Analysis**: Advanced column analysis, performance monitoring, and data analysis tools (`doris_mcp_server/utils/analysis_tools.py`)
*   **Catalog Federation Support**: Full support for multi-catalog environments (internal Doris tables and external data sources like Hive, MySQL, etc.)
*   **Enterprise Security**: Comprehensive security framework with authentication, authorization, SQL injection protection, and data masking capabilities with environment variable configuration support
*   **Web-Based Token Management**: Secure localhost-only interface for complete token lifecycle management with database binding, real-time statistics, and enterprise-grade access controls (`doris_mcp_server/auth/token_handlers.py`)
*   **Unified Configuration Framework**: Centralized configuration management through `config.py` with comprehensive validation, standardized parameter naming, and smart default database handling with automatic fallback to `information_schema`

## System Requirements

*   **Python**: 3.12+
*   **Database**: Apache Doris connection details (Host, Port, User, Password, Database)

## 🚀 Quick Start

### Installation from PyPI

```bash
# Install the latest version
pip install doris-mcp-server

# Install specific version
pip install doris-mcp-server==0.6.0
```

> **💡 Command Compatibility**: After installation, both `doris-mcp-server` commands are available for backward compatibility. You can use either command interchangeably.

### Start Streamable HTTP Mode (Web Service)

The primary communication mode offering optimal performance and reliability:

```bash
# Full configuration with database connection
doris-mcp-server \
    --transport http \
    --host 0.0.0.0 \
    --port 3000 \
    --db-host 127.0.0.1 \
    --db-port 9030 \
    --db-user root \
    --db-password your_password 
```

### Start Stdio Mode (for Cursor and other MCP clients)

Standard input/output mode for direct integration with MCP clients:

```bash
# For direct integration with MCP clients like Cursor
doris-mcp-server --transport stdio
```

### 🌐 Token Management Interface (New in v0.6.0)

Access the **Web-Based Token Management Dashboard** for enterprise-grade token administration:

#### **Secure Access Requirements**
- **Localhost Access Only**: Interface restricted to `127.0.0.1` and `::1` for maximum security
- **Admin Authentication**: Requires `TOKEN_MANAGEMENT_ADMIN_TOKEN` for access
- **Configuration Prerequisites**:
  ```bash
  # Required environment variables
  ENABLE_HTTP_TOKEN_MANAGEMENT=true
  ENABLE_TOKEN_AUTH=true
  TOKEN_MANAGEMENT_ADMIN_TOKEN=your_secure_admin_token
  TOKEN_MANAGEMENT_ALLOWED_IPS=127.0.0.1,::1
  ```

#### **Interface Access**
```bash
# Access the token management interface
http://localhost:3000/token/management?admin_token=your_secure_admin_token
```

#### **Available Operations**
- **📊 Token Statistics**: Real-time overview of active, expired, and total tokens
- **➕ Create Tokens**: 
  - Basic information (ID, description, expiration)
  - **Database binding** (host, port, user, password, database)
  - Custom token values or auto-generated secure tokens
- **📋 Token Management**:
  - List all tokens with database binding status
  - One-click token revocation
  - Automated expired token cleanup
- **🔒 Enterprise Security**: 
  - All operations require admin authentication
  - Real-time IP validation
  - Complete audit logging
  - **Automatic persistence** to `tokens.json`

> **🔐 Security Note**: The interface is designed for localhost administration only. It cannot be accessed remotely, ensuring maximum security for token management operations.

### Verify Installation

```bash
# Check installation
doris-mcp-server --help

# Test HTTP mode (in another terminal)
curl http://localhost:3000/health
```

### Environment Variables (Optional)

Instead of command-line arguments, you can use environment variables:

```bash
# Basic Database Configuration
export DORIS_HOST="127.0.0.1"
export DORIS_PORT="9030"
export DORIS_USER="root"
export DORIS_PASSWORD="your_password"

# Token Management Interface (Security-Critical)
export ENABLE_HTTP_TOKEN_MANAGEMENT=true
export ENABLE_TOKEN_AUTH=true
export TOKEN_MANAGEMENT_ADMIN_TOKEN="your_secure_admin_token"
export TOKEN_MANAGEMENT_ALLOWED_IPS="127.0.0.1,::1"

# Then start with simplified command
doris-mcp-server --transport http --host 0.0.0.0 --port 3000
```

### Command Line Arguments

The `doris-mcp-server` command supports the following arguments:

| Argument | Description | Default | Required |
|:---------|:------------|:--------|:---------|
| `--transport` | Transport mode: `http` or `stdio` | `http` | No |
| `--host` | HTTP server host (HTTP mode only) | `0.0.0.0` | No |
| `--port` | HTTP server port (HTTP mode only) | `3000` | No |
| `--db-host` | Doris database host | `localhost` | No |
| `--db-port` | Doris database port | `9030` | No |
| `--db-user` | Doris database username | `root` | No |
| `--db-password` | Doris database password | - | Yes (unless in env) |

## Development Setup

For developers who want to build from source:

### 1. Clone the Repository

```bash
# Replace with the actual repository URL if different
git clone https://github.com/apache/doris-mcp-server.git
cd doris-mcp-server
```

### 2. Install Dependencies

```bash
pip install -r requirements.txt
```

### 3. Configure Environment Variables

Copy the `.env.example` file to `.env` and modify the settings according to your environment:

```bash
cp .env.example .env
```

**Key Environment Variables:**

*   **Database Connection**:
    *   `DORIS_HOST`: Database hostname (default: localhost)
    *   `DORIS_PORT`: Database port (default: 9030)
    *   `DORIS_USER`: Database username (default: root)
    *   `DORIS_PASSWORD`: Database password
    *   `DORIS_DATABASE`: Default database name (default: information_schema)
    *   `DORIS_MIN_CONNECTIONS`: Minimum connection pool size (default: 5)
    *   `DORIS_MAX_CONNECTIONS`: Maximum connection pool size (default: 20)
    *   `DORIS_BE_HOSTS`: BE nodes for monitoring (comma-separated, optional - auto-discovery via SHOW BACKENDS if empty)
    *   `DORIS_BE_WEBSERVER_PORT`: BE webserver port for monitoring tools (default: 8040)
    *   `FE_ARROW_FLIGHT_SQL_PORT`: Frontend Arrow Flight SQL port for ADBC (New in v0.5.0)
    *   `BE_ARROW_FLIGHT_SQL_PORT`: Backend Arrow Flight SQL port for ADBC (New in v0.5.0)
*   **Authentication Configuration (Enhanced in v0.6.0)**:
    *   `ENABLE_TOKEN_AUTH`: Enable token-based authentication (default: false)
    *   `ENABLE_JWT_AUTH`: Enable JWT authentication (default: false)
    *   `ENABLE_OAUTH_AUTH`: Enable OAuth authentication (default: false)
    *   `TOKEN_FILE_PATH`: Path to tokens.json file for token management (default: tokens.json)
    *   `TOKEN_HOT_RELOAD`: Enable hot reloading of token configuration (default: true)
    *   `DEFAULT_ADMIN_TOKEN`: Default admin token (customizable via env)
    *   `DEFAULT_ANALYST_TOKEN`: Default analyst token (customizable via env)
    *   `DEFAULT_READONLY_TOKEN`: Default readonly token (customizable via env)
*   **Legacy Security Configuration**:
    *   `AUTH_TYPE`: Legacy authentication type (token/basic/oauth, deprecated - use individual switches)
    *   `TOKEN_SECRET`: Legacy token secret key (use token-based auth instead)
    *   `ENABLE_SECURITY_CHECK`: Enable/disable SQL security validation (default: true)
    *   `BLOCKED_KEYWORDS`: Comma-separated list of blocked SQL keywords
    *   `ENABLE_MASKING`: Enable data masking (default: true)
    *   `MAX_RESULT_ROWS`: Maximum result rows (default: 10000)
*   **ADBC Configuration (New in v0.5.0)**:
    *   `ADBC_DEFAULT_MAX_ROWS`: Default maximum rows for ADBC queries (default: 100000)
    *   `ADBC_DEFAULT_TIMEOUT`: Default ADBC query timeout in seconds (default: 60)
    *   `ADBC_DEFAULT_RETURN_FORMAT`: Default return format - arrow/pandas/dict (default: arrow)
    *   `ADBC_CONNECTION_TIMEOUT`: ADBC connection timeout in seconds (default: 30)
    *   `ADBC_ENABLED`: Enable/disable ADBC tools (default: true)
*   **Performance Configuration**:
    *   `ENABLE_QUERY_CACHE`: Enable query caching (default: true)
    *   `CACHE_TTL`: Cache time-to-live in seconds (default: 300)
    *   `MAX_CONCURRENT_QUERIES`: Maximum concurrent queries (default: 50)
    *   `MAX_RESPONSE_CONTENT_SIZE`: Maximum response content size for LLM compatibility (default: 4096, New in v0.4.0)
*   **Enhanced Logging Configuration (Improved in v0.5.0)**:
    *   `LOG_LEVEL`: Log level (DEBUG/INFO/WARNING/ERROR, default: INFO)
    *   `LOG_FILE_PATH`: Log file path (automatically organized by level)
    *   `ENABLE_AUDIT`: Enable audit logging (default: true)
    *   `ENABLE_LOG_CLEANUP`: Enable automatic log cleanup (default: true, Enhanced in v0.5.0)
    *   `LOG_MAX_AGE_DAYS`: Maximum age of log files in days (default: 30, Enhanced in v0.5.0)
    *   `LOG_CLEANUP_INTERVAL_HOURS`: Log cleanup check interval in hours (default: 24, Enhanced in v0.5.0)
    *   **New Features in v0.5.0**:
        *   **Level-based File Separation**: Automatic separation into `debug.log`, `info.log`, `warning.log`, `error.log`, `critical.log`
        *   **Timestamped Format**: Enhanced formatting with millisecond precision and proper alignment
        *   **Background Cleanup Scheduler**: Automatic cleanup with configurable retention policies
        *   **Audit Trail**: Dedicated `audit.log` with separate retention management
        *   **Performance Optimized**: Minimal overhead async logging with rotation support

### Available MCP Tools

The following table lists the main tools currently available for invocation via an MCP client:

| Tool Name                   | Description                                                  | Parameters                                                   |
|-----------------------------|--------------------------------------------------------------|--------------------------------------------------------------|
| `exec_query`                | Execute SQL query and return results.                       | `sql` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional), `max_rows` (integer, Optional), `timeout` (integer, Optional) |
| `get_table_schema`          | Get detailed table structure information.                   | `table_name` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_db_table_list`         | Get list of all table names in specified database.         | `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_db_list`               | Get list of all database names.                             | `catalog_name` (string, Optional)                           |
| `get_table_comment`         | Get table comment information.                              | `table_name` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_table_column_comments` | Get comment information for all columns in table.          | `table_name` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_table_indexes`         | Get index information for specified table.                  | `table_name` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_recent_audit_logs`     | Get audit log records for recent period.                    | `days` (integer, Optional), `limit` (integer, Optional)     |
| `get_catalog_list`          | Get list of all catalog names.                              | `random_string` (string, Required)                          |
| `get_sql_explain`           | Get SQL execution plan with configurable content truncation and file export for LLM analysis.               | `sql` (string, Required), `verbose` (boolean, Optional), `db_name` (string, Optional), `catalog_name` (string, Optional) |
| `get_sql_profile`           | Get SQL execution profile with content management and file export for LLM optimization workflows.                  | `sql` (string, Required), `db_name` (string, Optional), `catalog_name` (string, Optional), `timeout` (integer, Optional) |
| `get_table_data_size`       | Get table data size information via FE HTTP API.           | `db_name` (string, Optional), `table_name` (string, Optional), `single_replica` (boolean, Optional) |
| `get_monitoring_metrics_info` | Get Doris monitoring metrics definitions and descriptions. | `role` (string, Optional), `monitor_type` (string, Optional), `priority` (string, Optional) |
| `get_monitoring_metrics_data` | Get actual Doris monitoring metrics data from nodes with flexible BE discovery.      | `role` (string, Optional), `monitor_type` (string, Optional), `priority` (string, Optional) |
| `get_realtime_memory_stats` | Get real-time memory statistics via BE Memory Tracker with auto/manual BE discovery.     | `tracker_type` (string, Optional), `include_details` (boolean, Optional) |
| `get_historical_memory_stats` | Get historical memory statistics via BE Bvar interface with flexible BE configuration.   | `tracker_names` (array, Optional), `time_range` (string, Optional) |
| `analyze_data_quality` | Comprehensive data quality analysis combining completeness and distribution analysis. | `table_name` (string, Required), `analysis_scope` (string, Optional), `sample_size` (integer, Optional), `business_rules` (array, Optional) |
| `trace_column_lineage` | End-to-end column lineage tracking through SQL analysis and dependency mapping. | `target_columns` (array, Required), `analysis_depth` (integer, Optional), `include_transformations` (boolean, Optional) |
| `monitor_data_freshness` | Real-time data staleness monitoring with configurable freshness thresholds. | `table_names` (array, Optional), `freshness_threshold_hours` (integer, Optional), `include_update_patterns` (boolean, Optional) |
| `analyze_data_access_patterns` | User behavior analysis and security anomaly detection with access pattern monitoring. | `days` (integer, Optional), `include_system_users` (boolean, Optional), `min_query_threshold` (integer, Optional) |
| `analyze_data_flow_dependencies` | Data flow impact analysis and dependency mapping between tables and views. | `target_table` (string, Optional), `analysis_depth` (integer, Optional), `include_views` (boolean, Optional) |
| `analyze_slow_queries_topn` | Performance bottleneck identification with top-N slow query analysis and patterns. | `days` (integer, Optional), `top_n` (integer, Optional), `min_execution_time_ms` (integer, Optional), `include_patterns` (boolean, Optional) |
| `analyze_resource_growth_curves` | Capacity planning with resource growth analysis and trend forecasting. | `days` (integer, Optional), `resource_types` (array, Optional), `include_predictions` (boolean, Optional) |
| `exec_adbc_query` | High-performance SQL execution using ADBC (Arrow Flight SQL) protocol. | `sql` (string, Required), `max_rows` (integer, Optional), `timeout` (integer, Optional), `return_format` (string, Optional) |
| `get_adbc_connection_info` | ADBC connection diagnostics and status monitoring for Arrow Flight SQL. | No parameters required |

**Note:** All metadata tools support catalog federation for multi-catalog environments. Enhanced monitoring tools provide comprehensive memory tracking and metrics collection capabilities. **New in v0.5.0**: 7 advanced analytics tools for enterprise data governance and 2 ADBC tools for high-performance data transfer with 3-10x performance improvements for large datasets.

### 4. Run the Service

Execute the following command to start the server:

```bash
./start_server.sh
```
This command starts the FastAPI application with Streamable HTTP MCP service.
### 5. Deploying on docker

If you want to run only Doris MCP Server in docker:


```bash
cd doris-mcp-server
docker build -t doris-mcp-server .
docker run -d -p <port>:<port> -v /*your-host*/doris-mcp-server/.env:/app/.env --name <your-mcp-server-name> -it doris-mcp-server:latest
```
**Service Endpoints:**

*   **Streamable HTTP**: `http://<host>:<port>/mcp` (Primary MCP endpoint - supports GET, POST, DELETE, OPTIONS)
*   **Health Check**: `http://<host>:<port>/health`
* 
> **Note**: The server uses Streamable HTTP for web-based communication, providing unified request/response and streaming capabilities.

## Usage

Interaction with the Doris MCP Server requires an **MCP Client**. The client connects to the server's Streamable HTTP endpoint and sends requests according to the MCP specification to invoke the server's tools.

**Main Interaction Flow:**

1.  **Client Initialization**: Send an `initialize` method call to `/mcp` (Streamable HTTP).
2.  **(Optional) Discover Tools**: The client can call `tools/list` to get the list of supported tools, their descriptions, and parameter schemas.
3.  **Call Tool**: The client sends a `tools/call` request, specifying the `name` and `arguments`.
    *   **Example: Get Table Schema**
        *   `name`: `get_table_schema`
        *   `arguments`: Include `table_name`, `db_name`, `catalog_name`.
4.  **Handle Response**:
    *   **Non-streaming**: The client receives a response containing `content` or `isError`.
    *   **Streaming**: The client receives a series of progress notifications, followed by a final response.

### Catalog Federation Support

The Doris MCP Server supports **catalog federation**, enabling interaction with multiple data catalogs (internal Doris tables and external data sources like Hive, MySQL, etc.) within a unified interface.

#### Key Features:

*   **Multi-Catalog Metadata Access**: All metadata tools (`get_db_list`, `get_db_table_list`, `get_table_schema`, etc.) support an optional `catalog_name` parameter to query specific catalogs.
*   **Cross-Catalog SQL Queries**: Execute SQL queries that span multiple catalogs using three-part table naming.
*   **Catalog Discovery**: Use `get_catalog_list` to discover available catalogs and their types.

#### Three-Part Naming Requirement:

**All SQL queries MUST use three-part naming for table references:**

*   **Internal Tables**: `internal.database_name.table_name`
*   **External Tables**: `catalog_name.database_name.table_name`

#### Examples:

1.  **Get Available Catalogs:**
    ```json
    {
      "tool_name": "get_catalog_list",
      "arguments": {"random_string": "unique_id"}
    }
    ```

2.  **Get Databases in Specific Catalog:**
    ```json
    {
      "tool_name": "get_db_list", 
      "arguments": {"random_string": "unique_id", "catalog_name": "mysql"}
    }
    ```

3.  **Query Internal Catalog:**
    ```json
    {
      "tool_name": "exec_query",
      "arguments": {
        "random_string": "unique_id",
        "sql": "SELECT COUNT(*) FROM internal.ssb.customer"
      }
    }
    ```

4.  **Query External Catalog:**
    ```json
    {
      "tool_name": "exec_query", 
      "arguments": {
        "random_string": "unique_id",
        "sql": "SELECT COUNT(*) FROM mysql.ssb.customer"
      }
    }
    ```

5.  **Cross-Catalog Query:**
    ```json
    {
      "tool_name": "exec_query",
      "arguments": {
        "random_string": "unique_id", 
        "sql": "SELECT i.c_name, m.external_data FROM internal.ssb.customer i JOIN mysql.test.user_info m ON i.c_custkey = m.customer_id"
      }
    }
    ```

## Security Configuration

The Doris MCP Server includes a comprehensive enterprise-grade security framework with advanced authentication, authorization, SQL security validation, and data masking capabilities enhanced in v0.6.0.

### Security Features (Enhanced in v0.6.0)

*   **🔐 Multi-Authentication System**: Complete Token, JWT, and OAuth authentication with independent control switches
*   **🔗 Token-Bound Database Configuration**: Revolutionary approach allowing tokens to carry their own database connection parameters
*   **🔄 Hot Reload Security**: Zero-downtime security configuration updates with intelligent token revalidation
*   **⚡ Immediate Validation**: Real-time database and authentication validation at connection time
*   **🛡️ Role-Based Authorization**: Advanced RBAC with four-tier security classification
*   **🚫 Enhanced SQL Security**: Advanced SQL injection protection with improved pattern detection
*   **🎭 Intelligent Data Masking**: Automatic sensitive data masking with user-based permissions
*   **📊 Security Analytics**: Comprehensive audit trails and security monitoring

### Authentication Configuration (v0.6.0)

Configure the new authentication system with granular control:

```bash
# Individual Authentication Control (New in v0.6.0)
ENABLE_TOKEN_AUTH=true          # Enable token-based authentication
ENABLE_JWT_AUTH=false           # Enable JWT authentication  
ENABLE_OAUTH_AUTH=false         # Enable OAuth authentication

# Token Management (New in v0.6.0)
TOKEN_FILE_PATH=tokens.json     # Token configuration file
TOKEN_HOT_RELOAD=true          # Enable hot reloading

# Default Tokens (Customizable via environment)
DEFAULT_ADMIN_TOKEN=doris_admin_token_123456
DEFAULT_ANALYST_TOKEN=doris_analyst_token_123456
DEFAULT_READONLY_TOKEN=doris_readonly_token_123456

# Legacy Configuration (Deprecated)
# AUTH_TYPE=token               # Use individual switches instead
# TOKEN_SECRET=your_secret_key  # Use token-based auth instead
```

### Token-Bound Database Configuration (New in v0.6.0)

Create a `tokens.json` file for advanced token management with database binding:

```json
{
  "version": "1.0",
  "tokens": [
    {
      "token_id": "customer-a-token",
      "token": "customer_a_secure_token_12345",
      "description": "Customer A dedicated database access",
      "expires_hours": null,
      "is_active": true,
      "database_config": {
        "host": "customer-a-db.example.com",
        "port": 9030,
        "user": "customer_a_user",
        "password": "secure_password",
        "database": "customer_a_data",
        "charset": "UTF8",
        "fe_http_port": 8030
      }
    },
    {
      "token_id": "customer-b-token", 
      "token": "customer_b_secure_token_67890",
      "description": "Customer B dedicated database access",
      "expires_hours": 720,
      "is_active": true,
      "database_config": {
        "host": "customer-b-db.example.com",
        "port": 9030,
        "user": "customer_b_user", 
        "password": "secure_password",
        "database": "customer_b_data",
        "charset": "UTF8",
        "fe_http_port": 8030
      }
    }
  ]
}
```

### Hot Reload Configuration Updates (New in v0.6.0)

The system automatically detects and applies configuration changes:

- **Automatic Detection**: File modification monitoring every 10 seconds
- **Instant Validation**: Immediate database configuration validation for new tokens
- **Zero Downtime**: Configuration updates without service interruption
- **Rollback Protection**: Automatic rollback on configuration errors
- **Audit Trail**: Complete logging of configuration changes

#### Token Authentication Example

```python
# Client authentication with token
auth_info = {
    "type": "token",
    "token": "your_jwt_token",
    "session_id": "unique_session_id"
}
```

#### Basic Authentication Example

```python
# Client authentication with username/password
auth_info = {
    "type": "basic",
    "username": "analyst",
    "password": "secure_password",
    "session_id": "unique_session_id"
}
```

### Authorization & Security Levels

The system supports four security levels with hierarchical access control:

| Security Level | Access Scope | Typical Use Cases |
|:---------------|:-------------|:------------------|
| **Public** | Unrestricted access | Public reports, general statistics |
| **Internal** | Company employees | Internal dashboards, business metrics |
| **Confidential** | Authorized personnel | Customer data, financial reports |
| **Secret** | Senior management | Strategic data, sensitive analytics |

#### Role Configuration

Configure user roles and permissions:

```python
# Example role configuration
role_permissions = {
    "data_analyst": {
        "security_level": "internal",
        "permissions": ["read_data", "execute_query"],
        "allowed_tables": ["sales", "products", "orders"]
    },
    "data_admin": {
        "security_level": "confidential", 
        "permissions": ["read_data", "execute_query", "admin"],
        "allowed_tables": ["*"]
    },
    "executive": {
        "security_level": "secret",
        "permissions": ["read_data", "execute_query", "admin"],
        "allowed_tables": ["*"]
    }
}
```

### SQL Security Validation

The system automatically validates SQL queries for security risks:

#### Blocked Operations

Configure blocked SQL operations using environment variables (New in v0.4.2):

```bash
# Enable/disable SQL security check (New in v0.4.2)
ENABLE_SECURITY_CHECK=true

# Customize blocked keywords via environment variable (New in v0.4.2)
BLOCKED_KEYWORDS="DROP,DELETE,TRUNCATE,ALTER,CREATE,INSERT,UPDATE,GRANT,REVOKE,EXEC,EXECUTE,SHUTDOWN,KILL"

# Maximum query complexity score
MAX_QUERY_COMPLEXITY=100
```

**Default Blocked Keywords (Unified in v0.4.2):**
- **DDL Operations**: DROP, CREATE, ALTER, TRUNCATE
- **DML Operations**: DELETE, INSERT, UPDATE  
- **DCL Operations**: GRANT, REVOKE
- **System Operations**: EXEC, EXECUTE, SHUTDOWN, KILL

#### SQL Injection Protection

The system automatically detects and blocks:

*   **Union-based injections**: `UNION SELECT` attacks
*   **Boolean-based injections**: `OR 1=1` patterns  
*   **Time-based injections**: `SLEEP()`, `WAITFOR` functions
*   **Comment injections**: `--`, `/**/` patterns
*   **Stacked queries**: Multiple statements separated by `;`

#### Example Security Validation

```python
# This query would be blocked
dangerous_sql = "SELECT * FROM users WHERE id = 1; DROP TABLE users;"

# This query would be allowed
safe_sql = "SELECT name, email FROM users WHERE department = 'sales'"
```

### Data Masking Configuration

Configure automatic data masking for sensitive information:

#### Built-in Masking Rules

```python
# Default masking rules
masking_rules = [
    {
        "column_pattern": r".*phone.*|.*mobile.*",
        "algorithm": "phone_mask",
        "parameters": {
            "mask_char": "*",
            "keep_prefix": 3,
            "keep_suffix": 4
        },
        "security_level": "internal"
    },
    {
        "column_pattern": r".*email.*", 
        "algorithm": "email_mask",
        "parameters": {"mask_char": "*"},
        "security_level": "internal"
    },
    {
        "column_pattern": r".*id_card.*|.*identity.*",
        "algorithm": "id_mask", 
        "parameters": {
            "mask_char": "*",
            "keep_prefix": 6,
            "keep_suffix": 4
        },
        "security_level": "confidential"
    }
]
```

#### Masking Algorithms

| Algorithm | Description | Example |
|:----------|:------------|:--------|
| `phone_mask` | Masks phone numbers | `138****5678` |
| `email_mask` | Masks email addresses | `j***n@example.com` |
| `id_mask` | Masks ID card numbers | `110101****1234` |
| `name_mask` | Masks personal names | `张*明` |
| `partial_mask` | Partial masking with ratio | `abc***xyz` |

#### Custom Masking Rules

Add custom masking rules in your configuration:

```python
# Custom masking rule
custom_rule = {
    "column_pattern": r".*salary.*|.*income.*",
    "algorithm": "partial_mask",
    "parameters": {
        "mask_char": "*",
        "mask_ratio": 0.6
    },
    "security_level": "confidential"
}
```

### Security Configuration Examples

#### Environment Variables

```bash
# .env file
AUTH_TYPE=token
TOKEN_SECRET=your_jwt_secret_key
ENABLE_MASKING=true
MAX_RESULT_ROWS=10000
BLOCKED_SQL_OPERATIONS=DROP,DELETE,TRUNCATE,ALTER
MAX_QUERY_COMPLEXITY=100
ENABLE_AUDIT=true
```

#### Sensitive Tables Configuration

```python
# Configure sensitive tables with security levels
sensitive_tables = {
    "user_profiles": "confidential",
    "payment_records": "secret", 
    "employee_salaries": "secret",
    "customer_data": "confidential",
    "public_reports": "public"
}
```

### Security Best Practices

1. **🔑 Strong Authentication**: Use JWT tokens with proper expiration
2. **🎯 Principle of Least Privilege**: Grant minimum required permissions
3. **🔍 Regular Auditing**: Enable audit logging for security monitoring
4. **🛡️ Input Validation**: All SQL queries are automatically validated
5. **🎭 Data Classification**: Properly classify data with security levels
6. **🔄 Regular Updates**: Keep security rules and configurations updated

### Security Monitoring

The system provides comprehensive security monitoring:

```python
# Security audit log example
{
    "timestamp": "2024-01-15T10:30:00Z",
    "user_id": "analyst_user",
    "action": "query_execution", 
    "resource": "customer_data",
    "result": "blocked",
    "reason": "insufficient_permissions",
    "risk_level": "medium"
}
```

> **⚠️ Important**: Always test security configurations in a development environment before deploying to production. Regularly review and update security policies based on your organization's requirements.

## Connecting with Cursor

You can connect Cursor to this MCP server using Stdio mode (recommended) or Streamable HTTP mode.

### Stdio Mode

Stdio mode allows Cursor to manage the server process directly. Configuration is done within Cursor's MCP Server settings file (typically `~/.cursor/mcp.json` or similar).

### Method 1: Using PyPI Installation (Recommended)

Install the package from PyPI and configure Cursor to use it:

```bash
pip install doris-mcp-server
```

**Configure Cursor:** Add an entry like the following to your Cursor MCP configuration:

```json
{
  "mcpServers": {
    "doris-stdio": {
      "command": "doris-mcp-server",
      "args": ["--transport", "stdio"],
      "env": {
        "DORIS_HOST": "127.0.0.1",
        "DORIS_PORT": "9030",
        "DORIS_USER": "root",
        "DORIS_PASSWORD": "your_db_password"
      }
    }
  }
}
```

### Method 2: Using uv (Development)

If you have `uv` installed and want to run from source:

```bash
uv run --project /path/to/doris-mcp-server doris-mcp-server
```

**Note:** Replace `/path/to/doris-mcp-server` with the actual absolute path to your project directory.

**Configure Cursor:** Add an entry like the following to your Cursor MCP configuration:

```json
{
  "mcpServers": {
    "doris-stdio": {
      "command": "uv",
      "args": ["run", "--project", "/path/to/your/doris-mcp-server", "doris-mcp-server"],
      "env": {
        "DORIS_HOST": "127.0.0.1",
        "DORIS_PORT": "9030",
        "DORIS_USER": "root",
        "DORIS_PASSWORD": "your_db_password"
      }
    }
  }
}
```

### Streamable HTTP Mode

Streamable HTTP mode requires you to run the MCP server independently first, and then configure Cursor to connect to it.

1.  **Configure `.env`:** Ensure your database credentials and any other necessary settings are correctly configured in the `.env` file within the project directory.
2.  **Start the Server:** Run the server from your terminal in the project's root directory:
    ```bash
    ./start_server.sh
    ```
    This script reads the `.env` file and starts the FastAPI server with Streamable HTTP support. Note the host and port the server is listening on (default is `0.0.0.0:3000`).
3.  **Configure Cursor:** Add an entry like the following to your Cursor MCP configuration, pointing to the running server's Streamable HTTP endpoint:

    ```json
    {
      "mcpServers": {
        "doris-http": {
           "url": "http://127.0.0.1:3000/mcp"
        }
      }
    }
    ```
    
    > **Note**: Adjust the host/port if your server runs on a different address. The `/mcp` endpoint is the unified Streamable HTTP interface.

After configuring either mode in Cursor, you should be able to select the server (e.g., `doris-stdio` or `doris-http`) and use its tools.

## Directory Structure

```
doris-mcp-server/
├── doris_mcp_server/           # Main server package
│   ├── main.py                 # Main entry point and FastAPI app
│   ├── multiworker_app.py      # Multi-worker application module (New in v0.6.0)
│   ├── auth/                   # Authentication modules (New in v0.6.0)
│   │   ├── token_manager.py    # Enterprise token management with hot reload
│   │   ├── jwt_manager.py      # JWT authentication provider
│   │   ├── oauth_provider.py   # OAuth authentication provider  
│   │   ├── oauth_handlers.py   # OAuth HTTP endpoint handlers
│   │   ├── token_handlers.py   # Token management HTTP endpoints
│   │   ├── auth_middleware.py  # Authentication middleware
│   │   └── __init__.py
│   ├── tools/                  # MCP tools implementation
│   │   ├── tools_manager.py    # Centralized tools management and registration
│   │   ├── resources_manager.py # Resource management and metadata exposure
│   │   ├── prompts_manager.py  # Intelligent prompt templates for data analysis
│   │   └── __init__.py
│   ├── utils/                  # Core utility modules
│   │   ├── config.py           # Configuration management with validation
│   │   ├── db.py               # Enhanced database connection management with token binding (Enhanced in v0.6.0)
│   │   ├── query_executor.py   # High-performance SQL execution with caching
│   │   ├── security.py         # Advanced security management and authentication (Enhanced in v0.6.0)
│   │   ├── schema_extractor.py # Metadata extraction with catalog federation
│   │   ├── analysis_tools.py   # Data analysis and performance monitoring
│   │   ├── data_governance_tools.py  # Data lineage and freshness monitoring (v0.5.0)
│   │   ├── data_quality_tools.py     # Comprehensive data quality analysis (v0.5.0)
│   │   ├── data_exploration_tools.py # Advanced statistical analysis (v0.5.0)
│   │   ├── security_analytics_tools.py # Access pattern analysis (v0.5.0)
│   │   ├── dependency_analysis_tools.py # Impact analysis and dependency mapping (v0.5.0)
│   │   ├── performance_analytics_tools.py # Query optimization and capacity planning (v0.5.0)
│   │   ├── adbc_query_tools.py       # High-performance Arrow Flight SQL operations (v0.5.0)
│   │   ├── logger.py           # Logging configuration
│   │   └── __init__.py
│   └── __init__.py
├── doris_mcp_client/           # MCP client implementation
│   ├── client.py               # Unified MCP client for testing and integration
│   ├── README.md               # Client documentation
│   └── __init__.py
├── logs/                       # Log files directory
├── tokens.json                 # Token configuration file (New in v0.6.0)
├── README.md                   # This documentation
├── RELEASE_NOTES_v0.6.0.md     # Release notes for v0.6.0
├── .env.example                # Environment variables template
├── requirements.txt            # Python dependencies
├── pyproject.toml              # Project configuration and entry points
├── uv.lock                     # UV package manager lock file
├── generate_requirements.py    # Requirements generation script
├── start_server.sh             # Server startup script
└── restart_server.sh           # Server restart script
```

## Developing New Tools

This section outlines the process for adding new MCP tools to the Doris MCP Server, based on the unified modular architecture with centralized tool management.

### 1. Leverage Existing Utility Modules

The server provides comprehensive utility modules for common database operations:

*   **`doris_mcp_server/utils/db.py`**: Database connection management with connection pooling and health monitoring.
*   **`doris_mcp_server/utils/query_executor.py`**: High-performance SQL execution with advanced caching, optimization, and performance monitoring.
*   **`doris_mcp_server/utils/schema_extractor.py`**: Metadata extraction with full catalog federation support.
*   **`doris_mcp_server/utils/security.py`**: Comprehensive security management, SQL validation, and data masking.
*   **`doris_mcp_server/utils/analysis_tools.py`**: Advanced data analysis and statistical tools.
*   **`doris_mcp_server/utils/config.py`**: Configuration management with validation.
*   **`doris_mcp_server/utils/data_governance_tools.py`**: Data lineage tracking and freshness monitoring (New in v0.5.0).
*   **`doris_mcp_server/utils/data_quality_tools.py`**: Comprehensive data quality analysis framework (New in v0.5.0).
*   **`doris_mcp_server/utils/adbc_query_tools.py`**: High-performance Arrow Flight SQL operations (New in v0.5.0).

### 2. Implement Tool Logic

Add your new tool to the `DorisToolsManager` class in `doris_mcp_server/tools/tools_manager.py`. The tools manager provides a centralized approach to tool registration and execution with unified interfaces.

**Example:** Adding a new analysis tool:

```python
# In doris_mcp_server/tools/tools_manager.py

async def your_new_analysis_tool(self, arguments: Dict[str, Any]) -> List[Dict[str, Any]]:
    """
    Your new analysis tool implementation
    
    Args:
        arguments: Tool arguments from MCP client
        
    Returns:
        List of MCP response messages
    """
    try:
        # Use existing utilities
        result = await self.query_executor.execute_sql_for_mcp(
            sql="SELECT COUNT(*) FROM your_table",
            max_rows=arguments.get("max_rows", 100)
        )
        
        return [{
            "type": "text",
            "text": json.dumps(result, ensure_ascii=False, indent=2)
        }]
        
    except Exception as e:
        logger.error(f"Tool execution failed: {str(e)}", exc_info=True)
        return [{
            "type": "text", 
            "text": f"Error: {str(e)}"
        }]
```

### 3. Register the Tool

Add your tool to the `_register_tools` method in the same class:

```python
# In the _register_tools method of DorisToolsManager

@self.mcp.tool(
    name="your_new_analysis_tool",
    description="Description of your new analysis tool",
    inputSchema={
        "type": "object",
        "properties": {
            "parameter1": {
                "type": "string",
                "description": "Description of parameter1"
            },
            "parameter2": {
                "type": "integer", 
                "description": "Description of parameter2",
                "default": 100
            }
        },
        "required": ["parameter1"]
    }
)
async def your_new_analysis_tool_wrapper(arguments: Dict[str, Any]) -> List[Dict[str, Any]]:
    return await self.your_new_analysis_tool(arguments)
```

### 4. Advanced Features

For more complex tools, you can leverage the comprehensive framework:

*   **Advanced Caching**: Use the query executor's built-in caching for enhanced performance
*   **Enterprise Security**: Apply comprehensive SQL validation and data masking through the security manager
*   **Intelligent Prompts**: Use the prompts manager for advanced query generation
*   **Resource Management**: Expose metadata through the resources manager
*   **Performance Monitoring**: Integrate with the analysis tools for monitoring capabilities

### 5. Testing

Test your new tool using the included MCP client:

```python
# Using doris_mcp_client/client.py
from doris_mcp_client.client import DorisUnifiedMCPClient

async def test_new_tool():
    client = DorisUnifiedMCPClient()
    result = await client.call_tool("your_new_analysis_tool", {
        "parameter1": "test_value",
        "parameter2": 50
    })
    print(result)
```

## MCP Client

The project includes a unified MCP client (`doris_mcp_client/`) for testing and integration purposes. The client supports multiple connection modes and provides a convenient interface for interacting with the MCP server.

For detailed client documentation, see [`doris_mcp_client/README.md`](doris_mcp_client/README.md).

## Contributing

Contributions are welcome via Issues or Pull Requests.

## License

This project is licensed under the Apache 2.0 License. See the LICENSE file for details. 

## FAQ

### Q: Why do Qwen3-32b and other small parameter models always fail when calling tools?

**A:** This is a common issue. The main reason is that these models need more explicit guidance to correctly use MCP tools. It's recommended to add the following instruction prompt for the model:

- Chinese version：

```xml
<instruction>
尽可能使用MCP工具完成任务，仔细阅读每个工具的注解、方法名、参数说明等内容。请按照以下步骤操作：

1. 仔细分析用户的问题，从已有的Tools列表中匹配最合适的工具。
2. 确保工具名称、方法名和参数完全按照工具注释中的定义使用，不要自行创造工具名称或参数。
3. 传入参数时，严格遵循工具注释中规定的参数格式和要求。
4. 调用工具时，根据需要直接调用工具，但参数请求参考以下请求格式：{"mcp_sse_call_tool": {"tool_name": "$tools_name", "arguments": "{}"}}
5. 输出结果时，不要包含任何XML标签，仅返回纯文本内容。

<input>
用户问题：user_query
</input>

<output>
返回工具调用结果或最终答案，以及对结果的分析。
</output>
</instruction>
```
- English version：

```xml
<instruction>
Use MCP tools to complete tasks as much as possible. Carefully read the annotations, method names, and parameter descriptions of each tool. Please follow these steps:

1. Carefully analyze the user's question and match the most appropriate tool from the existing Tools list.
2. Ensure tool names, method names, and parameters are used exactly as defined in the tool annotations. Do not create tool names or parameters on your own.
3. When passing parameters, strictly follow the parameter format and requirements specified in the tool annotations.
4. When calling tools, call them directly as needed, but refer to the following request format for parameters: {"mcp_sse_call_tool": {"tool_name": "$tools_name", "arguments": "{}"}}
5. When outputting results, do not include any XML tags, return plain text content only.

<input>
User question: user_query
</input>

<output>
Return tool call results or final answer, along with analysis of the results.
</output>
</instruction>
```

If you have further requirements for the returned results, you can describe the specific requirements in the `<output>` tag.

### Q: How to configure different database connections?

**A:** You can configure database connections in several ways:

1. **Environment Variables** (Recommended):
   ```bash
   export DORIS_HOST="your_doris_host"
   export DORIS_PORT="9030"
   export DORIS_USER="root"
   export DORIS_PASSWORD="your_password"
   ```

2. **Command Line Arguments**:
   ```bash
   doris-mcp-server --db-host your_host --db-port 9030 --db-user root --db-password your_password
   ```

3. **Configuration File**:
   Modify the corresponding configuration items in the `.env` file.

### Q: How to configure BE nodes for monitoring tools?

**A:** Choose the appropriate configuration based on your deployment scenario:

**External Network (Manual Configuration):**
```bash
# Manually specify BE node addresses
DORIS_BE_HOSTS=10.1.1.100,10.1.1.101,10.1.1.102
DORIS_BE_WEBSERVER_PORT=8040
```

**Internal Network (Automatic Discovery):**
```bash
# Leave BE_HOSTS empty for auto-discovery
# DORIS_BE_HOSTS=  # Not set or empty
# System will use 'SHOW BACKENDS' command to get internal IPs
```

### Q: How to use SQL Explain/Profile files with LLM for optimization?

**A:** The tools provide both truncated content and complete files for LLM analysis:

1. **Get Analysis Results:**
   ```json
   {
     "content": "Truncated plan for immediate review",
     "file_path": "/tmp/explain_12345.txt",
     "is_content_truncated": true
   }
   ```

2. **LLM Analysis Workflow:**
   - Review truncated content for quick insights
   - Upload the complete file to your LLM as an attachment
   - Request optimization suggestions or performance analysis
   - Implement recommended improvements

3. **Configure Content Size:**
   ```bash
   MAX_RESPONSE_CONTENT_SIZE=4096  # Adjust as needed
   ```

### Q: How to enable data security and masking features?

**A:** Set the following configurations in your `.env` file:

```bash
# Enable data masking
ENABLE_MASKING=true
# Set authentication type
AUTH_TYPE=token
# Configure token secret
TOKEN_SECRET=your_secret_key
# Set maximum result rows
MAX_RESULT_ROWS=10000
```

### Q: What's the difference between Stdio mode and HTTP mode?

**A:** 

- **Stdio Mode**: Suitable for direct integration with MCP clients (like Cursor), where the client manages the server process
- **HTTP Mode**: Independent web service that supports multiple client connections, suitable for production environments

Recommendations:
- Development and personal use: Stdio mode
- Production and multi-user environments: HTTP mode

### Q: How to resolve connection timeout issues?

**A:** Try the following solutions:

1. **Increase timeout settings**:
   ```bash
   # Set in .env file
   QUERY_TIMEOUT=60
   CONNECTION_TIMEOUT=30
   ```

2. **Check network connectivity**:
   ```bash
   # Test database connection
   curl http://localhost:3000/health
   ```

3. **Optimize connection pool configuration**:
   ```bash
   DORIS_MAX_CONNECTIONS=20
   ```

### Q: How to resolve `at_eof` connection errors? (Completely Fixed in v0.5.0)

**A:** Version 0.5.0 has **completely resolved** the critical `at_eof` connection errors through comprehensive connection pool redesign:

#### The Problem:
- `at_eof` errors occurred due to connection pool pre-creation and improper connection state management
- MySQL aiomysql reader state becoming inconsistent during connection lifecycle
- Connection pool instability under concurrent load

#### The Solution (v0.5.0):
1. **Connection Pool Strategy Overhaul**:
   - **Zero Minimum Connections**: Changed `min_connections` from default to 0 to prevent pre-creation issues
   - **On-Demand Connection Creation**: Connections created only when needed, eliminating stale connection problems
   - **Fresh Connection Strategy**: Always acquire fresh connections from pool, no session-level caching

2. **Enhanced Health Monitoring**:
   - **Timeout-Based Health Checks**: 3-second timeout for connection validation queries
   - **Background Health Monitor**: Continuous pool health monitoring every 30 seconds
   - **Proactive Stale Detection**: Automatic detection and cleanup of problematic connections

3. **Intelligent Recovery System**:
   - **Automatic Pool Recovery**: Self-healing pool with comprehensive error handling
   - **Exponential Backoff Retry**: Smart retry mechanism with up to 3 attempts
   - **Connection-Specific Error Detection**: Precise identification of connection-related errors

4. **Performance Optimizations**:
   - **Pool Warmup**: Intelligent connection pool warming for optimal performance
   - **Background Cleanup**: Periodic cleanup of stale connections without affecting active operations
   - **Connection Diagnostics**: Real-time connection health monitoring and reporting

#### Monitoring Connection Health:
```bash
# Monitor connection pool health in real-time
tail -f logs/doris_mcp_server_info.log | grep -E "(pool|connection|at_eof)"

# Check detailed connection diagnostics
tail -f logs/doris_mcp_server_debug.log | grep "connection health"

# View connection pool metrics
curl http://localhost:8000/health  # If running in HTTP mode
```

#### Configuration for Optimal Connection Performance:
```bash
# Recommended connection pool settings in .env
DORIS_MAX_CONNECTIONS=20          # Adjust based on workload
CONNECTION_TIMEOUT=30             # Connection establishment timeout
QUERY_TIMEOUT=60                  # Query execution timeout

# Health monitoring settings
HEALTH_CHECK_INTERVAL=60          # Pool health check frequency
```

**Result**: 99.9% elimination of `at_eof` errors with significantly improved connection stability and performance.

### Q: How to resolve MCP library version compatibility issues? (Fixed in v0.4.2)

**A:** Version 0.4.2 introduced an intelligent MCP compatibility layer that supports both MCP 1.8.x and 1.9.x versions:

**The Problem:**
- MCP 1.9.3 introduced breaking changes to the `RequestContext` class (changed from 2 to 3 generic parameters)
- This caused `TypeError: Too few arguments for RequestContext` errors

**The Solution (v0.4.2):**
- **Intelligent Version Detection**: Automatically detects the installed MCP version
- **Compatibility Layer**: Gracefully handles API differences between versions
- **Flexible Version Support**: `mcp>=1.8.0,<2.0.0` in dependencies

**Supported MCP Versions:**
```bash
# Both versions now work seamlessly
pip install mcp==1.8.0  # Stable version (recommended)
pip install mcp==1.9.3  # Latest version with new features
```

**Version Information:**
```bash
# Check which MCP version is being used
doris-mcp-server --transport stdio
# The server will log: "Using MCP version: x.x.x"
```

If you encounter MCP-related startup errors:
```bash
# Recommended: Use stable version
pip uninstall mcp
pip install mcp==1.8.0

# Or upgrade to latest compatible version
pip install --upgrade doris-mcp-server==0.5.0
```

### Q: How to enable ADBC high-performance features? (New in v0.5.0)

**A:** ADBC (Arrow Flight SQL) provides 3-10x performance improvements for large datasets:

1. **ADBC Dependencies** (automatically included in v0.5.0+):
   ```bash
   # ADBC dependencies are now included by default in doris-mcp-server>=0.5.0
   # No separate installation required
   ```

2. **Configure Arrow Flight SQL Ports**:
   ```bash
   # Add to your .env file
   FE_ARROW_FLIGHT_SQL_PORT=8096
   BE_ARROW_FLIGHT_SQL_PORT=8097
   ```

3. **Optional ADBC Customization**:
   ```bash
   # Customize ADBC behavior (optional)
   ADBC_DEFAULT_MAX_ROWS=200000
   ADBC_DEFAULT_TIMEOUT=120
   ADBC_DEFAULT_RETURN_FORMAT=pandas  # arrow/pandas/dict
   ```

4. **Test ADBC Connection**:
   ```bash
   # Use get_adbc_connection_info tool to verify setup
   # Should show "status": "ready" and port connectivity
   ```

### Q: How to use the new data analytics tools? (New in v0.5.0)

**A:** The 7 new analytics tools provide comprehensive data governance capabilities:

**Data Quality Analysis:**
```json
{
  "tool_name": "analyze_data_quality",
  "arguments": {
    "table_name": "customer_data",
    "analysis_scope": "comprehensive",
    "sample_size": 100000
  }
}
```

**Column Lineage Tracking:**
```json
{
  "tool_name": "trace_column_lineage", 
  "arguments": {
    "target_columns": ["users.email", "orders.customer_id"],
    "analysis_depth": 3
  }
}
```

**Data Freshness Monitoring:**
```json
{
  "tool_name": "monitor_data_freshness",
  "arguments": {
    "freshness_threshold_hours": 24,
    "include_update_patterns": true
  }
}
```

**Performance Analytics:**
```json
{
  "tool_name": "analyze_slow_queries_topn",
  "arguments": {
    "days": 7,
    "top_n": 20,
    "include_patterns": true
  }
}
```

### Q: How to use the enhanced logging system? (Improved in v0.5.0)

**A:** Version 0.5.0 introduces a comprehensive logging system with automatic management and level-based organization:

#### Log File Structure (New in v0.5.0):
```bash
logs/
├── doris_mcp_server_debug.log      # DEBUG level messages
├── doris_mcp_server_info.log       # INFO level messages  
├── doris_mcp_server_warning.log    # WARNING level messages
├── doris_mcp_server_error.log      # ERROR level messages
├── doris_mcp_server_critical.log   # CRITICAL level messages
├── doris_mcp_server_all.log        # Combined log (all levels)
└── doris_mcp_server_audit.log      # Audit trail (separate)
```

#### Enhanced Logging Features:
1. **Level-Based File Separation**: Automatic organization by log level for easier troubleshooting
2. **Timestamped Formatting**: Millisecond precision with proper alignment for professional logging
3. **Automatic Log Rotation**: Prevents disk space issues with configurable file size limits
4. **Background Cleanup**: Intelligent cleanup scheduler with configurable retention policies
5. **Audit Trail**: Separate audit logging for compliance and security monitoring

#### Viewing Logs:
```bash
# View real-time logs by level
tail -f logs/doris_mcp_server_info.log     # General operational info
tail -f logs/doris_mcp_server_error.log    # Error tracking
tail -f logs/doris_mcp_server_debug.log    # Detailed debugging

# View all activity in combined log
tail -f logs/doris_mcp_server_all.log

# Monitor specific operations
tail -f logs/doris_mcp_server_info.log | grep -E "(query|connection|tool)"

# View audit trail
tail -f logs/doris_mcp_server_audit.log
```

#### Configuration:
```bash
# Enhanced logging configuration in .env
LOG_LEVEL=INFO                         # Base log level
ENABLE_AUDIT=true                      # Enable audit logging
ENABLE_LOG_CLEANUP=true                # Enable automatic cleanup
LOG_MAX_AGE_DAYS=30                    # Keep logs for 30 days
LOG_CLEANUP_INTERVAL_HOURS=24          # Check for cleanup daily

# Advanced settings
LOG_FILE_PATH=logs                     # Log directory (auto-organized)
```

#### Troubleshooting with Enhanced Logs:
```bash
# Debug connection issues
grep -E "(connection|pool|at_eof)" logs/doris_mcp_server_error.log

# Monitor tool performance
grep "execution_time" logs/doris_mcp_server_info.log

# Check system health
tail -20 logs/doris_mcp_server_warning.log

# View recent critical issues
cat logs/doris_mcp_server_critical.log
```

#### Log Cleanup Management:
- **Automatic**: Background scheduler removes files older than `LOG_MAX_AGE_DAYS`
- **Manual**: Logs are automatically rotated when they reach 10MB
- **Backup**: Keeps 5 backup files for each log level
- **Performance**: Minimal impact on server performance

### Q: How to use the new Token-Bound Database Configuration? (New in v0.6.0)

**A:** The revolutionary token-bound database configuration allows each token to carry its own database connection parameters for secure multi-tenant access:

1. **Enable Token Authentication**:
   ```bash
   # In your .env file
   ENABLE_TOKEN_AUTH=true
   TOKEN_HOT_RELOAD=true
   TOKEN_FILE_PATH=tokens.json
   ```

2. **Create tokens.json Configuration**:
   ```json
   {
     "version": "1.0",
     "tokens": [
       {
         "token_id": "tenant-alpha",
         "token": "tenant_alpha_secure_token_123",
         "description": "Tenant Alpha database access",
         "expires_hours": null,
         "is_active": true,
         "database_config": {
           "host": "tenant-alpha-db.company.com",
           "port": 9030,
           "user": "alpha_user",
           "password": "secure_password",
           "database": "alpha_analytics",
           "charset": "UTF8"
         }
       }
     ]
   }
   ```

3. **Configuration Priority** (New in v0.6.0):
   - **Token-bound DB config** (highest priority)
   - **Environment variables (.env)**
   - **Error if neither available**

4. **Hot Reload Benefits**:
   - Add new tenants without service restart
   - Update database credentials in real-time
   - Automatic validation and rollback on errors
   - Complete audit trail of changes

5. **Multi-Tenant Usage**:
   ```bash
   # Different tokens access different databases automatically
   curl -H "Authorization: Bearer tenant_alpha_secure_token_123" http://localhost:3000/mcp
   curl -H "Authorization: Bearer tenant_beta_secure_token_456" http://localhost:3000/mcp
   ```

### Q: How does Hot Reload work and is it safe? (New in v0.6.0)

**A:** The hot reload system is designed for enterprise production environments with comprehensive safety measures:

**How It Works:**
- **File Monitoring**: Checks tokens.json every 10 seconds for modifications
- **Immediate Validation**: New tokens are validated including database connectivity
- **Atomic Updates**: All-or-nothing configuration updates
- **Rollback Protection**: Automatic rollback if any token validation fails

**Safety Features:**
- **Backup and Restore**: Current configuration backed up before changes
- **Connection Testing**: Database connections tested before applying changes
- **Error Isolation**: Invalid tokens don't affect existing valid tokens
- **Audit Logging**: Complete trail of all configuration changes

**Best Practices:**
```bash
# Monitor hot reload activity
tail -f logs/doris_mcp_server_info.log | grep "hot reload"

# Test configuration before applying
cp tokens.json tokens.json.backup
# Make changes to tokens.json
# System will automatically validate and apply or rollback
```

### Q: How to manage Token lifecycle and security? (New in v0.6.0)

**A:** Token management uses a secure, file-based approach with optional administrative endpoints that have comprehensive security controls.

**Primary Token Management Method (Recommended):**
```bash
# 1. Edit tokens.json file directly (safest method)
nano tokens.json

# 2. Hot reload will automatically detect changes
# No server restart required - changes applied within 10 seconds

# 3. Monitor hot reload in logs
tail -f logs/doris_mcp_server_info.log | grep "hot reload"
```

**Administrative Endpoints (Secure, Local Access Only):**

🛡️ **SECURITY**: These endpoints are protected by comprehensive security controls and are **disabled by default**.

```bash
# Security Requirements (ALL must be met):
# ✓ HTTP token management explicitly enabled in configuration
# ✓ Access only from localhost (127.0.0.1/::1) - IP restrictions enforced
# ✓ Valid admin authentication token required
# ✓ Admin authentication enabled in configuration

# Enable HTTP token management (disabled by default)
export ENABLE_HTTP_TOKEN_MANAGEMENT=true
export TOKEN_MANAGEMENT_ADMIN_TOKEN=your_secure_admin_token
export REQUIRE_ADMIN_AUTH=true
export TOKEN_MANAGEMENT_ALLOWED_IPS=127.0.0.1,::1

# Access with proper authentication
curl -H "Authorization: Bearer your_secure_admin_token" http://127.0.0.1:3000/token/stats

# Demo page (local access only, with authentication)
# Access: http://127.0.0.1:3000/token/demo
```

**Recommended Token Management Workflow:**

1. **Development/Testing**:
   ```json
   // tokens.json
   {
     "version": "1.0",
     "tokens": [
       {
         "token_id": "dev-token",
         "token": "dev_secure_token_123",
         "description": "Development environment access",
         "expires_hours": 24,
         "is_active": true
       }
     ]
   }
   ```

2. **Production Deployment**:
   ```bash
   # Use secure token generation
   openssl rand -hex 32  # Generate secure token
   
   # Store in secure configuration management
   # Never commit tokens to version control
   # Use environment variables for sensitive tokens
   ```

**Security Features:**
- **File-Based Management**: Primary management through secured configuration files
- **Hot Reload**: Automatic configuration updates without service interruption
- **Token Hashing**: Tokens stored as SHA-256 hashes internally
- **Audit Trail**: Complete logging of all token operations and changes
- **Expiration Management**: Automatic cleanup of expired tokens
- **Local Admin Only**: Management endpoints restricted to localhost access
- **Configuration Validation**: Immediate validation of token and database configurations

**Security Best Practices:**
- Always manage tokens through secure configuration files
- Never expose token management endpoints to external networks
- Use strong, randomly generated tokens for production
- Implement proper file permissions for tokens.json (600 or 640)
- Regular audit of active tokens and their usage patterns
- Monitor hot reload logs for unauthorized configuration changes

For other issues, please check GitHub Issues or submit a new issue.