SAP PO PROXY方式可以连接多个client吗？

最新推荐文章于 2025-09-06 19:56:32 发布
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SAP S4 与 PO 一起部署，PO与S4的集成大都会使用PROXY这种方式，那么，SAP  PO  PROXY方式可以连接多个client吗？可以的。

比如S4的DEV开发系统与PO的POD开发系统，集成部署；PO的PROXY是连接到DEV的client300中，ABAP的接口程序是在client300的数据环境中工作。

我们还有一个client400,需要单独测试一下某个PO接口，这时，需要在POD上把同S4连接的通道CC(Communication Component)与BS(Business System)都单独重建一个，然后把原来的替换掉。

BS的设置：

 IB中的通道设置：

 

 

SAP PO/PI教程 Process Orchestration The Comprehensive Guide
12-18
SAP Process Orchestration The Comprehensive Guide, 2nd Edition SAP流程编制综合指南 1 Introduction to SAP Process Orchestration 1.1 Historical Overview and Evolution 1.1.1 SAP Process Integration 1.1.2 SAP Composition Environment 1.1.3 SAP Process Orchestration 1.1.4 SAP Process Orchestration 7.5 Highlights 1.2 SAP Process Orchestration Components 1.2.1 SAP Process Integration 1.2.2 Business Process Management 1.2.3 Business Rules Management 1.3 Architectural Overview and Positioning 1.3.1 SAP Process Orchestration Positioning 1.3.2 SAP NetWeaver Application Server for Java: System Architecture 1.3.3 SAP NetWeaver AS Java System Logical Layers 1.4 Installation Options 1.4.1 Case 1: SAP Process Integration Dual Stack 1.4.2 Case 2: SAP PI Dual Stack and SAP Composition Environment in Separate Installations 1.4.3 Case 3: SAP PI Single Stack and SAP Composition Environment in Separate Installations 1.4.4 Case 4: SAP PO—SAP PI and SAP Composition Environment in a Single Installation 1.5 Summary 2 Administration and Development Tools 2.1 SAP Process Orchestration Tools 2.1.1 Enterprise Services Repository 2.1.2 Integration Directory 2.1.3 System Landscape Directory 2.1.4 Configuration and Monitoring 2.2 SAP NetWeaver Administrator 2.2.1 Availability and Performance 2.2.2 Operations 2.2.3 Configuration 2.2.4 Troubleshooting 2.2.5 SOA 2.3 SAP NetWeaver Developer Studio 2.3.1 Use and Download 2.3.2 SAP Process Orchestration and SAP NetWeaver Developer Studio 2.4 Summary Part II Advanced Adapter Engine Extended (AEX) 3 Configuring the System Landscape Directory 3.1 System Landscape Directory Components and Features 3.1.1 Landscape 3.1.2 Software Catalog 3.1.3 Development 3.2 Registering Systems to the System Landscape Directory 3.2.1 Connecting to ABAP-Based Systems 3.2.2 Connecting to Java-Based Systems 3.2.3 Connecting to Other Systems 3.3 Administration of the System Landscape Directory 3.3.1 Server 3.3.2 Data and Content 3.4 System Landscape Directory Strategies 3.4.1 Manual Export and Import of Data 3.4.2 Automatic Bridge Forwarding 3.4.3 Full Automatic Synchronization 3.5 Tips and Tricks 3.5.1 Naming Convention 3.5.2 Keeping Your System Landscape Directory Catalogs Up to Date 3.5.3 Self-Registration of a Java-Based System with the SLD 3.5.4 Configuring Data Suppliers from One SLD to Another 3.5.5 Manual Export and Import of Data 3.5.6 Connecting the SLD to CTS+ to Facilitate the Export and Import of SLD Data 3.6 Exercise: Configuring the System Landscape Directory 3.6.1 Exercise Description 3.6.2 Exercise Solution Approach 3.6.3 Exercise Step-by-Step Solution 3.7 Summary 4 Working with the Enterprise Services Repository and Registry 4.1 Basic ES Repository Technical Concepts 4.1.1 Functional Blocks 4.1.2 First Steps in the Enterprise Services Repository 4.1.3 Service Interface 4.1.4 Integration Patterns: Stateful and Stateless Communication 4.1.5 Asynchronous versus Synchronous 4.1.6 Quality of Service 4.2 Design Objects 4.2.1 Software Component Versions 4.2.2 Folders 4.2.3 Namespaces 4.2.4 Mappings 4.2.5 Process Integration Scenario 4.2.6 Actions 4.3 Data Types and Message Types 4.3.1 Data Types 4.3.2 External Definitions 4.3.3 Message Type 4.3.4 Additional Design Objects 4.4 Exercise: Working with the ES Repository and Registry 4.4.1 Exercise Description 4.4.2 Exercise Solution Approach 4.4.3 Exercise Step-by-Step Solution 4.5 Summary 5 Working with the Integration Directory 5.1 Integration Directory Overview 5.2 Collaboration Profiles 5.2.1 Party 5.2.2 Communication Component 5.2.3 Communication Channel 5.2.4 Communication Component without a Party 5.3 Adapter Types 5.3.1 Technical Adapters to Enable Communication with SAP or Third-Party Systems 5.3.2 Application Adapters to Enable Communication with an SAP System 5.3.3 SAP Industry Adapters 5.3.4 Third-Party-Developed Adapters 5.4 Integrated Configuration 5.4.1 Inbound Processing 5.4.2 Receiver 5.4.3 Receiver Interfaces 5.4.4 Outbound Processing 5.5 The XI Message Protocol 5.6 Configuration Scenario 5.6.1 Creating a Configuration Scenario from Scratch (Manually) 5.6.2 Creating a Configuration Scenario from a Model 5.7 Value Mapping 5.7.1 If/Else Logic 5.7.2 Fixed Values 5.7.3 Value Mapping 5.8 Business-to-Business Integration 5.8.1 Business-to-Business On Premise 5.8.2 Business-to-Business Managed Services 5.8.3 Trading Partner Management 5.9 Axis Framework 5.10 Representational State Transfer Adapter 5.11 Message Alerting 5.11.1 Alert Rule Overview 5.11.2 Creating an Alert Rule 5.11.3 Editing or Deleting a Rule 5.12 Publish the Service in the Services Registry 5.13 Integration Directory Programming Interface (Directory API) 5.14 Exercise: Working with the Integration Directory 5.14.1 Exercise Description 5.14.2 Exercise Solution Approach 5.14.3 Exercise Step-by-Step Solution 5.15 Summary 6 Building an Integration Flow 6.1 SAP NetWeaver Developer Studio 6.1.1 Installing SAP NetWeaver Developer Studio 6.1.2 Setting Up SAP NetWeaver Developer Studio 6.1.3 Enterprise Integration Patterns and User-Defined Templates 6.2 Basics of Creating and Configuring an Integration Flow 6.2.1 Creating an iFlow 6.2.2 Configuring an iFlow 6.3 iFlow Example 6.3.1 Creating Products, Software Components, Business Systems, and Technical Systems in the SLD 6.3.2 Importing SLD Objects into the ES Repository in SAP NetWeaver Developer Studio 6.3.3 Create Enterprise Service Repository Objects 6.3.4 Create Directory Objects: Import Business Systems and Create iFlows 6.3.5 Testing the iFlow Scenario 6.3.6 Monitoring the Scenario 6.4 New Features of the Process Integration Designer 6.4.1 Export Objects from the Integration Designer 6.4.2 Automatically Deploy after Import 6.4.3 Version History and Deployment Status 6.5 Supporting Multiple Senders for Your iFlow 6.6 Exercise: Building an Integration Flow 6.6.1 Exercise Description 6.6.2 Exercise Solution Approach 6.6.3 Exercise Step-by-Step Solution 6.7 Summary 7 Administration and Monitoring in AEX 7.1 Administration 7.1.1 Central Administration Tool 7.1.2 SAP NetWeaver Administrator 7.1.3 SAP NetWeaver Application Server Java 7.1.4 SAP Process Integration Monitoring (pimon) 7.1.5 SAP Management Console 7.1.6 Config Tool 7.1.7 Administration Using Telnet 7.2 Monitoring 7.2.1 SAP NetWeaver Administrator 7.2.2 SAP Process Integration Local Monitoring 7.2.3 SAP PI Central Monitoring with SAP Solution Manager 7.2.4 Message Retention 7.2.5 User-Defined Message Search 7.3 Troubleshooting 7.3.1 Configuring Log and Traces 7.3.2 Using the Log Viewer 7.4 Summary 8 Migrating Interfaces from SAP PI Dual Stack to SAP PO 8.1 Migration Strategies 8.2 Migrating System Landscape Directory Content 8.2.1 Products 8.2.2 Software Components 8.2.3 Technical System 8.2.4 Business System 8.3 Migrating Enterprise Services Repository Content 8.3.1 Exporting Objects 8.3.2 Importing Objects 8.4 Migrating Integration Directory Content 8.4.1 Manually 8.4.2 Using the Migration Tool 8.5 Summary Part III Business Process Management and Composition 9 Introduction to SAP BPM and BPMN 2.0 9.1 Managing Business Processes 9.2 SAP Business Process Management 9.2.1 SAP BPM versus SAP Business Workflow 9.2.2 BPM before SAP BPM 9.2.3 SAP BPM Main Components 9.3 Business Process Model and Notation 2.0 9.3.1 Swimlanes 9.3.2 Artifacts 9.3.3 Flow Objects 9.3.4 Connections 9.4 Summary 10 Creating Your First SAP BPM Process 10.1 SAP BPM Positioning and Development Environment 10.1.1 Positioning 10.1.2 Setting Up Your Development Environment 10.2 Creating and Modeling an SAP BPM Process 10.2.1 Demonstration Scenario 10.2.2 Building an SAP BPM Process: Overview 10.2.3 SAP NetWeaver Developer Studio Perspective Concept 10.2.4 Create a Project in SAP NetWeaver Developer Studio 10.2.5 Creating a Process for Your BPMN 10.2.6 Creating a BPMN Model 10.3 Configuring the BPMN Model 10.3.1 Data Objects 10.3.2 Creating Data Structures 10.3.3 Importing XSD and WSDL 10.3.4 Process Pool Properties 10.3.5 BPMN Flow Objects 10.4 Flow Objects 10.4.1 Events 10.4.2 Tasks 10.4.3 Activities 10.4.4 Gateways 10.4.5 Artifacts 10.5 Build and Deploy Your Process 10.5.1 Steps for Building a Process 10.5.2 Steps for Deploying a Process 10.6 Advanced Mapping 10.6.1 Mappings 10.6.2 Options in Mapping Assignment 10.6.3 Automatic Mapping 10.6.4 Custom Functions 10.7 Implementing Error Handling 10.8 Combining SAP BPM and the AEX 10.8.1 Message from SAP BPM to the AEX 10.8.2 Message from the AEX to SAP BPM 10.8.3 Leverage an ES Repository Mapping in SAP BPM 10.9 Exercise: Creating an SAP Business Process Management Process 10.9.1 Exercise Description 10.9.2 Exercise Solution Approach 10.9.3 Exercise Step-by-Step Solution 10.10 Summary 11 Applying Advanced SAP BPM Concepts and Extensions 11.1 Service-Oriented Architecture Configuration 11.1.1 Configuration for an Automated Activity 11.1.2 Configuration for a Start Event or Intermediary Event 11.2 Testing and Running an SAP BPM Process 11.2.1 Process Repository Overview 11.2.2 Process Testing 11.3 Custom Enterprise Java Bean Functions 11.3.1 Create EJB and EAR Development Components 11.3.2 Create the Enterprise Java Bean 11.3.3 Build and Deploy 11.3.4 Create a New Enterprise Java Bean Function 11.4 Using the Claim Check Pattern 11.4.1 Create Interfaces 11.4.2 Create Mappings 11.4.3 Configure the Channel 11.4.4 Retrieve the Large Message from SAP BPM 11.4.5 Update the Status of the Large Message from SAP BPM 11.5 SAP BPM Application Programming Interface 11.5.1 Prerequisite to Using the SAP BPM API 11.5.2 Implementation Aspects and Examples 11.6 SAP Business Process Management OData 11.6.1 OData Services for Tasks and Task Data 11.6.2 Error Handling 11.7 Using the Push API to Access SAP BPM Lifecycle Events 11.7.1 Accessing Events through a Message Driven Bean 11.7.2 Accessing Events through a Java Message Service API 11.8 Debugging and Troubleshooting SAP BPM Processes 11.8.1 Place Breakpoints in the Process 11.8.2 Add a Debug Configuration 11.9 Tuning SAP BPM-Related Performance Parameters 11.10 Best Practices for Your SAP BPM Application 11.10.1 BPMN, Mapping, and Parallelism 11.10.2 Task Related 11.10.3 Gateways 11.10.4 Looping 11.10.5 Data Object 11.10.6 Correlation 11.10.7 Error Handling 11.10.8 Housekeeping 11.11 Exercise: Applying Advanced SAP BPM Concepts and Extensions 11.11.1 Exercise Solution Approach 11.11.2 Exercise Step-by-Step Solution 11.12 Summary 12 Combining SAP BPM and UI Technologies 12.1 Web Dynpro Java User Interface Technology 12.1.1 Generating a Web Dynpro User Interface 12.1.2 Post-Configuration Steps 12.2 Integrating SAPUI5 into an SAP BPM Process 12.2.1 SAPUI5 Technology Platform 12.2.2 Model-View-Controller Concept 12.2.3 SAPUI5 Components 12.2.4 Other SAPUI5 Concepts 12.2.5 Integration Steps 12.3 Other User Interface Technologies 12.3.1 Visual Composer 12.3.2 Adobe Offline Forms 12.3.3 Support for Custom User Interface Technologies 12.4 Summary 13 SAP Business Rules Management 13.1 How Business Rules Work 13.2 SAP Business Rules Management 13.2.1 Rules Composer 13.2.2 Rules Manager 13.2.3 Rules Engine 13.3 Modeling Business Rules with Rules Composer 13.3.1 Create the Rules Composer Development Component 13.3.2 Adding Context to the Rules 13.3.3 Creating a Ruleset 13.3.4 Flow Ruleset 13.4 Testing Business Rules 13.5 Best Practices for Modeling Business Rules 13.5.1 Separate Decision Logic from Other Types of Logic 13.5.2 Reuse and Extend before Building 13.6 Exercise: SAP Business Rules Management 13.6.1 Exercise Solution Approach 13.6.2 Exercise Step-by-Step Solution 13.7 Summary 14 Implementing Java Proxies 14.1 Java Proxy Concept and Considerations 14.2 Implementation Approaches 14.2.1 Outside-In Approach 14.2.2 Inside-Out Approach 14.3 Technical Implementation 14.3.1 Development Environment 14.3.2 Developing a Server Java Proxy 14.3.3 Developing a Client Java Proxy 14.4 Building an Orchestration 14.5 Exercise: Implementing Java Proxies 14.5.1 Exercise Solution Approach 14.5.2 Exercise Step-by-Step Solution 14.6 Summary 15 Administration and Monitoring Message Processing in SAP BPM 15.1 Monitoring 15.1.1 SAP Business Process Management System Overview 15.1.2 Process Repository 15.1.3 Process Management 15.1.4 Task Management 15.1.5 SAP BPM Inbox 15.1.6 Business Logs 15.1.7 SAP BPM Action Monitor 15.1.8 Process Troubleshooting 15.1.9 Rules Business Logs 15.1.10 SAP BPM Analytics Dashboard 15.2 Administration 15.2.1 Process Data Archiving 15.2.2 Log Viewer 15.3 Summary 16 Migrating ccBPM from SAP PI to SAP PO 16.1 Motivation for Migration 16.2 Migration Approach 16.2.1 Analyze the As-Is Integration Processes 16.2.2 Translate and Redesign 16.2.3 Export and Reuse Enterprise Services Repository Objects 16.2.4 Migrate and Adapt Configuration Scenarios 16.3 Recommendations 16.4 Summary Part IV Advanced Concepts 17 SAP Cloud Platform Integration for SAP PO 17.1 Enable Cloud Integration Content in SAP PO 17.2 Reusing Cloud Integration Content 17.2.1 Download Cloud Integration Content 17.2.2 Deploy the Cloud Integration Content 17.3 Monitoring 17.3.1 Monitoring the Integration Gateway Component 17.3.2 Monitoring Messages Related to the Deployment of Cloud Integration Content 17.4 Summary 18 Additional Components for SAP Process Orchestration 18.1 Component Model 18.1.1 Product 18.1.2 Software Components 18.1.3 Development Component 18.1.4 Dependencies among Development Components 18.1.5 Public Parts 18.2 SAP NetWeaver Development Infrastructure 18.2.1 Change Management Services 18.2.2 Design Time Repository 18.2.3 Component Build Service 18.3 SAP Composite Application Framework 18.3.1 Design Time Aspects 18.3.2 Runtime Aspects 18.4 Service Registry 18.5 Enhanced Change and Transport System 18.5.1 SAP PI-Related Transports 18.5.2 Transports for Non-SAP PI Java Objects 18.6 Exercise: Create an SWCV 18.6.1 Exercise Solution Approach 18.6.2 Exercise Step-by-Step Solution 18.7 Summary 19 Landscape Setup Considerations 19.1 Java System Configuration 19.1.1 Java Sizing and Setup Considerations 19.1.2 Java System Architecture 19.1.3 Java Central Services 19.1.4 Java Parameter Tuning 19.2 Handling Certificates 19.2.1 Certificate Key Storage 19.2.2 Encryption of Message Content on Database Level 19.3 Housekeeping 19.3.1 Archiving 19.3.2 Deletion 19.3.3 Restarting 19.3.4 Recovery 19.4 Monitoring 19.4.1 Runtime Workbench 19.4.2 Wily Enterprise Manager 19.4.3 SAP Management Console 19.4.4 SAP Solution Manager Monitoring 19.4.5 Tracing 19.4.6 JVMMON 19.5 Summary A Orchestration Outlook A.1 SAP API Management A.2 SAP Cloud Platform Integration A.2.1 Features and Facts Overview of SAP Cloud Platform Integration A.2.2 Development Guide: Getting Started A.2.3 Monitoring A.3 The Integration Advisor A.3.1 Interface Specifications: Advice from the Advisor A.3.2 Mapping Guideline A.3.3 Runtime A.3.4 Testing A.4 SAP Cloud Platform Workflow as a Service A.4.1 Workflow Service A.4.2 Workflow Modeling A.4.3 SAP Cloud Platform Business Rules A.4.4 Workflow Tasks Management A.4.5 Integration 官方出品，英文原版，可编辑带导航非影印版（总计1866页）
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最新发布
11-26
<think> 我们讨论的是Redis Proxy模式，比如Twemproxy、Codis等。在这些代理模式下，由于数据可能被分片存储在不同的Redis实例上，所以对某些命令的支持程度与单机Redis不同。 1. **SCAN命令**：在单机Redis中，SCAN用于增量迭代键空间。但在代理模式下： - 如果代理支持跨节点扫描（如Codis），则需要代理层聚合所有分片的扫描结果，实现复杂且性能较差。 - 许多代理（如Twemproxy）直接不支持SCAN命令，因为无法高效地跨多个分片执行。 2. **SELECT命令**：在单机Redis中，SELECT用于切换数据库（0-15）。但在代理模式下： - 代理通常只使用数据库0（如Twemproxy），因为分片是按数据库0设计的。 - 如果客户端发送SELECT命令，代理可能会忽略或返回错误。 3. **Client命令**：如CLIENT LIST、CLIENT SETNAME等，这些命令在代理模式下： - 代理会拦截这些命令，因为客户端连接的是代理，而不是实际的Redis实例。 - 代理可能会提供自己的客户端管理命令（如Codis-proxy的proxy client list）。 下面以Codis为例，说明如何处理这些命令： ### 1. SCAN命令在Codis中的处理 Codis通过`SLOTSSCAN`命令模拟跨分片扫描，但官方建议避免在生产环境使用。替代方案： - 使用`KEYS`命令（不推荐，会阻塞） - 通过分片键设计避免全量扫描 ### 2. SELECT命令在Codis中的表现 Codis完全忽略SELECT命令，始终使用数据库0。如果客户端发送SELECT，代理会返回OK但实际不切换。 ### 3. Client命令的处理 Codis代理提供了自己的命令： - `proxy clients`：列出连接到代理的客户端 - `proxy help`：查看代理支持的命令 ### 代码示例：使用Python测试代理对SELECT和SCAN的支持 ```python import redis # 连接Codis代理 proxy = redis.Redis(host='proxy_host', port=19000) # 测试SELECT命令 try: resp = proxy.select(1) # 尝试切换到数据库1 print(f"SELECT命令响应: {resp}") # 通常返回True或OK，但实际未切换 except Exception as e: print(f"SELECT命令异常: {str(e)}") # 测试SCAN命令 try: cursor, keys = proxy.scan(cursor=0, match='*', count=100) print(f"首次扫描结果: {len(keys)} 个键") except redis.exceptions.ResponseError as e: print(f"SCAN命令错误: {str(e)}") # 可能返回错误，如"命令不支持" except Exception as e: print(f"扫描异常: {str(e)}") # 替代方案：分片扫描（需知道分片规则） # 注意：Codis分片基于slot，需遍历所有分片组 all_keys = [] for group_id in range(1, 4): # 假设有3个分片组 # 获取分片组的主节点 master_addr = get_master_addr_by_group(group_id) # 需从dashboard获取 r = redis.Redis(host=master_addr[0], port=master_addr[1]) cursor = 0 while True: cursor, keys = r.scan(cursor, match='*', count=100) all_keys.extend(keys) if cursor == 0: break print(f"总键数: {len(all_keys)}") ``` ### 各代理支持情况对比 | 命令 | Twemproxy | Codis | Redis Cluster | |-------------|-----------|-------|--------------| | SELECT | 不支持 | 忽略 | 只支持DB0 | | SCAN | 不支持 | 有限支持| 支持，但需每个节点扫描 | | CLIENT | 不支持 | 代理自定义命令 | 支持，但仅限当前节点 | ### 建议 1. 避免使用多数据库，始终使用DB0 2. 使用分片键前缀，确保相关数据在同一分片 3. 使用代理提供的监控接口替代CLIENT命令 --- §§相关问题§§: 1. 在Proxy模式下如何实现跨分片的模糊查询？ 2. 如何监控Proxy连接状态和请求延迟？ 3. Proxy模式与Redis Cluster的SCAN命令实现有何异同？ 4. 在Codis中如何安全地执行跨分片的批量删除操作？ </think>### Redis Proxy模式下对SCAN、SELECT和CLIENT命令的支持分析 在Redis Proxy架构中，命令支持情况取决于具体的代理实现（如Codis、Twemproxy、Redis Cluster Proxy等）。以下是关键命令的支持分析： #### 1. `SELECT` 命令支持情况 **问题本质**：Redis的多数据库特性与分片架构冲突 **代理行为**： ```python # 测试SELECT命令在Proxy中的表现 import redis # 连接Proxy r = redis.Redis(host='proxy-host', port=19000) try: # 尝试切换数据库 r.select(1) # 默认只支持DB0 print("SELECT命令成功执行") except redis.ResponseError as e: print(f"SELECT命令错误: {str(e)}") # 典型错误: "ERR SELECT is not allowed in proxy mode" ``` **根本原因**： - Proxy需要维护统一的路由表，多数据库会破坏分片映射 - 所有代理方案**只支持DB0**，其他数据库会被忽略或返回错误 - 替代方案：使用不同key前缀模拟"命名空间" #### 2. `SCAN` 命令支持情况 **挑战**：跨分片遍历的复杂性 **代理行为对比**： | 代理类型 | SCAN支持 | 代码表现 | |----------------|----------------------------------|----------------------------------| | Twemproxy | ❌ 完全不支持 | 返回`"ERR unknown command 'SCAN'"` | | Codis | ⚠️ 受限支持(需3.2+) | 返回部分分片数据，不保证完整性 | | Redis Cluster | ✅ 原生支持 | 自动路由到正确节点 | | Envoy Proxy | ⚠️ 依赖后端实现 | 透传给Redis服务 | **Codis中的SCAN示例**： ```python # Codis代理下的SCAN操作 cursor = 0 found_keys = [] while True: # 代理可能只返回当前分片的数据 cursor, keys = r.scan(cursor, match="user:*", count=100) found_keys.extend(keys) if cursor == 0: break print(f"找到 {len(found_keys)} 个键") # 注意：实际可能少于真实总数 ``` **使用建议**： 1. 避免生产环境使用SCAN - 改用直接键访问 2. 需要完整遍历时直连分片节点： ```bash # 遍历第3分片的所有键 redis-cli -h shard3-node -p 6379 --scan --pattern "user:*" ``` #### 3. `CLIENT` 命令支持情况 **核心问题**：客户端连接的是代理而非真实Redis **命令表现**： ```python try: # 尝试获取客户端列表 clients = r.client_list() print("客户端信息:", clients) except redis.ResponseError as e: print(f"CLIENT命令错误: {str(e)}") # 可能的成功响应（代理自定义实现）: # [{ # "id": "proxy-client-1", # "addr": "10.0.0.1:54321", # "cmd": "get" # }] ``` **各代理实现差异**： - **Twemproxy**：完全拒绝CLIENT命令 - **Codis**：提供简化版`proxy client list`命令 - **Redis Cluster Proxy**：支持受限的子命令如`CLIENT ID` #### 4. 生产环境最佳实践 **键扫描替代方案**： ```python # 使用分片感知的扫描 def sharded_scan(proxy, pattern): from codis import CodisClient # Codis专用客户端 c = CodisClient(proxy_host) total_keys = [] # 获取所有分片组 groups = c.list_group() for group in groups: # 直连分片主节点 shard_conn = redis.Redis(host=group.master) cursor = 0 while True: cursor, keys = shard_conn.scan(cursor, match=pattern) total_keys.extend(keys) if cursor == 0: break return total_keys ``` **多数据库替代方案**： ```python # 使用Key前缀模拟多数据库 def set_with_db(db_index, key, value): prefixed_key = f"db{db_index}_{key}" r.set(prefixed_key, value) def get_with_db(db_index, key): prefixed_key = f"db{db_index}_{key}" return r.get(prefixed_key) ``` --- ### 各代理方案命令支持总结 | 命令 | Twemproxy | Codis | Redis Cluster | AWS MemoryDB | |-------------|-----------|-------|--------------|-------------| | `SELECT n` | ❌ | ❌ | ❌ | ❌ | | `SCAN` | ❌ | ⚠️ | ✅ | ⚠️ | | `CLIENT LIST`| ❌ | ⚠️ | ✅ | ⚠️ | | `KEYS *` | ❌ | ❌ | ❌ | ❌ | | `MGET` | ✅ | ✅ | ⚠️¹ | ✅ | > ¹ Redis Cluster要求所有key在同一slot ---
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