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- What's New
- Function Overview
- Product Bulletin
-
Service Overview
- Infographics for Comparing DCS for Redis with Open-Source Redis
- What Is DCS?
- Application Scenarios
- Security
- DCS Instance Types
- DCS Instance Specifications
-
Command Compatibility
- Commands Supported and Disabled by DCS for Redis 4.0
- Commands Supported and Disabled by DCS for Redis 5.0
- Commands Supported and Disabled by DCS for Redis 6.0
- Commands Supported and Disabled in Web CLI
- Command Restrictions
- Other Command Usage Restrictions
- Commands Supported and Disabled by DCS for Redis 3.0 (Discontinued)
- Commands Supported and Disabled by DCS for Memcached (Discontinued)
- Disaster Recovery and Multi-Active Solution
- Cache Engine Differences
- Comparing DCS and Open-Source Cache Services
- Notes and Constraints
- Billing
- Permissions Management
- Basic Concepts
- Related Services
- Billing
- Getting Started
-
User Guide
- Process of Using DCS
- Creating a User and Granting DCS Permissions
- Buying a DCS Redis Instance
-
Accessing a DCS Redis Instance
- Configuring Redis Network Connections
- Controlling DCS Redis Access
-
Connecting to Redis on a Client
- Connecting to Redis on redis-cli
- Connecting to Redis on Jedis (Java)
- Connecting to Redis on Lettuce (Java)
- Connecting to Redis on Redisson (Java)
- Connecting to Redis on redis-py (Python)
- Connecting to Redis on go-redis (Go)
- Connecting to Redis on hiredis (C++)
- Connecting to Redis on StackExchange.Redis (C#)
- Connecting to Redis on phpredis (PHP)
- Connecting to Redis on predis (PHP)
- Connecting to Redis on ioredis (Node.js)
- Connecting to Redis on the Console
- Public Access to a DCS Redis 3.0 Instance (Discontinued)
- Accessing a DCS Memcached Instance (Discontinued)
-
Managing Instances
- Viewing and Modifying Basic Settings of a DCS Instance
- Viewing DCS Background Tasks
- Viewing Client Connection Information of a DCS Instance
- Modifying Configuration Parameters of a DCS Instance
- Configuring DCS Instance Parameter Templates
- Configuring DCS Instance Tags
- Renaming Critical Commands for DCS Instances
- Exporting a DCS Instance List
- Performing a Master/Standby Switchover for a DCS Instance
- Managing DCS Instance Shards and Replicas
- Backing Up or Restoring Instance Data
- Changing an Instance
- Managing Lifecycle of an Instance
- Diagnosing and Analyzing an Instance
- Migrating Instance Data
-
Testing Instance Performance
- Testing Redis Performance Using memtier_benchmark
- Testing Redis Performance Using redis-benchmark
- Comparing redis-benchmark and memtier_benchmark
-
Reference for a Redis Performance Test
- Test Data of Master/Standby DCS Redis 3.0 Instances
- Test Data of Proxy Cluster DCS Redis 3.0 Instances
- Test Data of Master/Standby DCS Redis 4.0 or 5.0 Instances
- Test Data of Proxy Cluster DCS Redis 4.0 or 5.0 Instances
- Test Data of Redis Cluster DCS Redis 4.0 or 5.0 Instances
- Test Data of Master/Standby DCS Redis 6.0 Instances
- Test Data of Redis Cluster DCS Redis 6.0 Instances
- Test Data of Redis Backup, Restoration, and Migration
- Applying for More DCS Quotas
- Viewing Monitoring Metrics and Configuring Alarms
- Viewing DCS Audit Logs
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Examples
-
API V2
- Lifecycle Management
-
Instance Management
- Querying Details of an Instance Parameter Modification Record
- Master/Standby Switchover
- Changing the Password
- Resetting a Password
- Querying DCS Instance Statuses
- Restarting DCS Instances or Clearing DCS Instance Data
- Querying Statistics of All Running Instances
- Enabling or Disabling Client IP Pass-through
- Switching Master/Replica Roles on a Cluster Shard
- Asynchronous Master/Replica Node Switchover
- Querying Whether Specifications of an Instance Can Be Increased
- Asynchronously Exporting Instances
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Switching IP
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Configuring Auto-Reconnect for Migration Tasks
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Stopping Synchronization of a Data Migration Task
- Querying the Migration Log List
- Restarting Online Migration Tasks in Batches
- Tag Management
-
Cache Analysis
- Querying Expired Key Scan Records
- Scanning for Expired Keys Immediately
- Creating a Big Key Analysis Task
- Listing Big Key Analysis Tasks
- Querying Big Key Analysis Details
- Deleting a Big Key Analysis Task
- Configuring Automatic Big Key Analysis
- Querying the Configurations of Automatic Big Key Analysis
- Creating a Hot Key Analysis Task
- Listing Hot Key Analysis Tasks
- Querying Hot Key Analysis Details
- Deleting a Hot Key Analysis Task
- Configuring Automatic Hot Key Analysis
- Querying the Configurations of Automatic Hot Key Analysis
- Creating an Expired Key Scan Task
- Querying Automatic Scanning Configuration
- Modifying Automatic Scanning Configuration
- Log Management
- Account Management
- Network Security
- Background Task Management
- Instance Diagnosis
- Template Management
- Other APIs
- Session Management
- Permissions Policies and Supported Actions
- Appendix
- Out-of-Date APIs (Unavailable Soon)
- SDK Reference
-
FAQs
- Instance Types/Versions
-
Feature
- What Are the CPU Specifications of DCS Instances?
- What Are Shard and Replica Quantities?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Does DCS for Redis Support Redis Clusters?
- What Are Redis Data Eviction Policies?
- Does DCS for Redis Support Read/Write Splitting?
- Does DCS for Redis Support Multi-DB?
- Does DCS Support External Extensions, Plug-ins, or Modules?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- Do DCS Redis Instances Limite Data Quantity?
-
Security
- How Do I Configure a Security Group?
- Why Can't Security Groups Be Configured for DCS Redis 4.0/5.0/6.0 Basic Edition Instances?
- How Can I Secure My DCS Redis Instances?
- Does DCS for Redis Support SSL Encrypted Transmission?
- How Do I Enable or Disable SSL for Public Access to a DCS Redis 3.0 Instance?
- Does DCS Support Cross-AZ Deployment?
- Is a Password Required for Accessing an Instance? How Do I Set a Password?
- Sentinel Principle
- Does DCS Support Sentinels?
-
Client and Network Connection
- Does DCS Support Public Access?
- Troubleshooting Redis Connection Failures
- Does DCS Support Cross-VPC Access?
- Will I Be Charged for the EIP Used for Public Access to a DCS Redis Instance?
- Why Is "(error) NOAUTH Authentication required" Displayed When I Access a DCS Redis Instance?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- What Can I Do If I Fail to Access a DCS Instance Using Its Domain Name Address?
- Can I Access DCS Instances in a Local Environment?
- What Should Be Noted When Using Redis for Pub/Sub?
- Why Is Public Access of My DCS Redis 3.0 Instance Unintentionally Disabled?
- What Can I Do If Error "Cannot assign requested address" Is Returned When I Access Redis Using connect?
- Connection Pool Selection and Recommended Jedis Parameter Settings
- What Can I Do If a Lettuce 6.x Client Is Incompatible with My DCS Instance?
- Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?
- Is the Read-only Address of a Master/Standby Instance Connected to the Master or Standby Node?
-
Redis Usage
- Can I Change the CPU Architecture?
- Can I Change the AZ for an Instance?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Why Do I Fail to Delete an Instance?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What Should I Do If an Error Occurs in redis_exporter?
- What Is Reserved Memory? How Do I Configure Reserved Memory?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Deleted Data of a DCS Instance?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- How Do I Check Redis Memory Usage?
- Why Is the Capacity or Performance of a Shard of a Redis Cluster Instance Overloaded When That of the Instance Is Still Below the Bottleneck?
- Why Does an OOM Error Occur During a Redis Connection?
- What Clients Can I Use for Redis Cluster in Different Programming Languages?
- Why Do I Need to Configure Timeout for Redis Cluster?
- Why Am I Seeing a Timeout Error When Reading Data from Redis?
- Explaining and Using Hash Tags
- Why Does a Key Disappear in Redis?
- Will Cached Data Be Retained After an Instance Is Restarted?
- How Do I Know Whether an Instance Is Single-DB or Multi-DB?
- Notes and Procedure for Enabling Multi-DB for Proxy Cluster Instances
- How Do I Create a Multi-DB Proxy Cluster Instance?
-
Instance Scaling and Upgrade
- Can I Upgrade Version for a DCS Redis Instance, for Example, from Redis 4.0 to Redis 5.0?
- Upgrading a Redis 3.0 Instance
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are DCS Instances Stopped or Restarted During Specification Modification?
- What DCS Instance Type Changes Are Supported?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Instance?
- How Do I Reduce the Capacity of a DCS Instance?
- How Do I Add Shards to a Cluster DCS Redis Instance Without Changing the Memory?
- How Do I Handle an Error When I Use Lettuce to Connect to a Redis Cluster Instance After Specification Modification?
- Can I Expand a Single Shard of a Cluster Instance (Scale-Up)?
-
Data Backup, Export, and Migration
- Can I Migrate Data from a Lower Redis Version to a Higher One?
- What Should I Consider When Transferring or Operating Data Between Different OSs?
- Can I Migrate Data from a Multi-DB Source Redis Instance to a Cluster DCS Redis Instance?
- What Are the Constraints and Precautions for Migrating Redis Data to a Cluster Instance?
- What Should I Consider for Online Migration?
- Can I Perform Online Migration Without Any Service Interruption?
- What If "Disconnecting timedout slave" and "overcoming of output buffer limits" Are Reported on the Source Instance During Online Migration?
- How Do I Export DCS Redis Instance Data?
- Why Is Memory of a DCS Redis Instance Unchanged After Data Migration Using Rump, Even If No Error Message Is Returned?
- Can I Export Backup Data of DCS Redis Instances to RDB Files on the Console?
- Where Are DCS Instance Backup Files Stored? How Many of Them Can Be Stored?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- When Will AOF Rewrites Be Triggered?
- What Are the Common Causes of Redis Migration Failures?
- Can I Migrate Data to Multiple Target Instances in One Migration Task?
- How Do I Enable the SYNC and PSYNC Commands?
- Will the Same Keys Be Overwritten During Data Migration or Backup Import?
- Why Does Redis Cluster Migration Fail If It Uses Built-in Keys and Cross-Slot Lua Scripts?
- Handling Migration Errors
- Troubleshooting Data Migration Failures
- How Do I Migrate Memcached Data?
- Can I Migrate Data Between DCS Memcached and Redis Instances?
-
Big/Hot Key Analysis and Expired Key Scan
- What Are Big Keys and Hot Keys?
- What Is the Impact of Big Keys or Hot Keys?
- How Do I Avoid Big Keys and Hot Keys?
- How Do I Analyze the Hot Keys of a DCS Redis 3.0 Instance?
- How Do I Detect Big Keys and Hot Keys in Advance?
- How Does DCS Delete Expired Keys?
- How Long Are Keys Stored? How Do I Set Key Expiration?
- Why Does Memory Usage Decrease After Big Key Analysis Is Performed on Redis?
-
Redis Commands
- Does DCS for Redis Support Command Audits?
- How Do I Clear Redis Data?
- How Do I Find Specified Keys and Traverse All Keys?
- Why Do I Fail to Execute Some Redis Commands?
- Why is "permission denied" Returned When I Run the KEYS Command in Web CLI?
- How Do I Rename High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
- Can I Configure Redis Keys to Be Case-Insensitive?
- Common Web CLI Errors
-
Monitoring and Alarm
- Why Is CPU Usage of a DCS Redis Instance 100%?
- How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Used Memory Greater Than Available Memory?
- Why Does Bandwidth Usage Exceed 100%?
- Why Is the Rejected Connections Metric Displayed?
- Why Is Flow Control Triggered? How Do I Handle It?
- Master/Standby Switchover
- Instance Creation and Permissions
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
- Troubleshooting
- Videos
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
- Operation Guide
- Monitoring
- Auditing
-
FAQs
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Public Access?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0 and 5.0 Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory of a DCS Redis 3.0 Instance Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Memory Usage More Than 100%?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What If Redis Commands Are Incompatible with DCS for Redis?
- Does DCS for Redis Provide Backend Management Software?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Rename High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 3.0 to Redis 4.0 or 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instance Resources Affected During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Redis Instance?
- Monitoring and Alarm
- Data Backup, Export, and Migration
- Master/Standby Switchover
-
Client and Network Connection
- Change History
- API Reference (ME-Abu Dhabi Region)
-
User Guide (Paris Region)
- Service Overview
- Getting Started
- Operation Guide
- Monitoring
- Auditing
-
FAQs
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Public Access?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Why Is Available Memory of a DCS Redis 3.0 Instance Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Memory Usage More Than 100%?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
- Why Is "Error in execution" Returned When I Access Redis?
-
Redis Commands
- Why is "permission denied" Returned When I Run the Keys Command in Web CLI?
- How Do I Clear Redis Data?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 3.0 to Redis 4.0 or 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instance Resources Affected During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Redis or Memcached Instance?
- Data Backup, Export, and Migration
- Master/Standby Switchover
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
-
Client and Network Connection
- Change History
-
API Reference (Paris Region)
- Before You Start
- API Overview
- Calling APIs
-
API V2
- Lifecycle Management
- Instance Management
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Configuring Auto-Reconnect for Migration Tasks
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Stopping Synchronization of a Data Migration Task
-
Cache Analysis
- Creating a Big Key Analysis Task
- Listing Big Key Analysis Tasks
- Querying Big Key Analysis Details
- Deleting a Big Key Analysis Task
- Configuring Automatic Big Key Analysis
- Querying the Configurations of Automatic Big Key Analysis
- Creating a Hot Key Analysis Task
- Listing Hot Key Analysis Tasks
- Querying Hot Key Analysis Details
- Deleting a Hot Key Analysis Task
- Configuring Automatic Hot Key Analysis
- Querying the Configurations of Automatic Hot Key Analysis
- Log Management
- Network Security
- Background Task Management
- Instance Diagnosis
- Template Management
- Other APIs
- Outdated APIs (V1)
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
User Guide (Kuala Lumpur Region)
-
Service Overview
- What Is DCS?
- Application Scenarios
- DCS Instance Types
- DCS Instance Specifications
- Command Compatibility
- Disaster Recovery and Multi-Active Solution
- Comparing Redis Versions
- Comparing Redis and Memcached
- Comparing DCS and Open-Source Cache Services
- Notes and Constraints
- Basic Concepts
- Permissions
- Related Services
- Permissions Management
- Process of Using DCS
-
Getting Started
- Creating an Instance
-
Accessing an Instance
- Network Conditions for Accessing DCS Redis
- Accessing a DCS Redis Instance Through redis-cli
- Access in Different Languages
- Accessing a DCS Redis 4.0/5.0/6.0 Instance on the Console
- Accessing a DCS Memcached Instance (Discontinued)
- Viewing Details of a DCS Instance
- Operating DCS Instances
-
Managing DCS Instances
- Configuration Notice
- Modifying Configuration Parameters
- Modifying the Security Group
- Viewing Background Tasks
- Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance
- Managing Tags
- Managing Shards and Replicas
- Analyzing Big Keys and Hot Keys
- Managing IP Address Whitelist
- Viewing Redis Slow Queries
- Viewing Redis Run Logs
- Diagnosing an Instance
- Transmitting DCS Redis Data with Encryption Using SSL
- Backing Up and Restoring DCS Instances
- Migrating Data with DCS
- Managing Passwords
- Parameter Templates
- Monitoring
- Auditing
- Data Migration Guide
-
FAQs
- Instance Types/Versions
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Access over Public Networks?
- Does DCS Support Cross-VPC Access?
- Why Is "(error) NOAUTH Authentication required" Displayed When I Access a DCS Redis Instance?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- Is a Password Required for Accessing an Instance? How Do I Set a Password?
- What Should Be Noted When Using Redis for Pub/Sub?
- How Do I Troubleshoot Redis Connection Failures?
- What Can I Do If Error "Cannot assign requested address" Is Returned When I Access Redis Using connect?
- Connection Pool Selection and Recommended Jedis Parameter Settings
-
Redis Usage
- What Are Shard and Replica Quantities?
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0/5.0/6.0 Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Does DCS for Redis Support Read/Write Splitting?How Do I Configure Read/Write Splitting for a Redis Cluster Instance?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- What Is Sentinel?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- How Can I Secure My DCS Redis Instances?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Why Do I Fail to Delete an Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Data from Deleted DCS Instances?
- Does DCS for Redis Support SSL Encrypted Transmission?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- How Do I Check Redis Memory Usage?
- Why Is the Capacity or Performance of a Shard of a Redis Cluster Instance Overloaded When That of the Instance Is Still Below the Bottleneck?
- Does DCS Support External Extensions, Plug-ins, or Modules?
- Why Is "Error in execution" Returned When I Access Redis?
- Why Does a Key Disappear in Redis?
- Why Does an OOM Error Occur During a Redis Connection?
- What Clients Can I Use for Redis Cluster in Different Programming Languages?
- Why Do I Need to Configure Timeout for Redis Cluster?
- Can I Change the AZ for an Instance?
- Explaining and Using Hash Tags
- Will Cached Data Be Retained After an Instance Is Restarted?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Find Specified Keys and Traverse All Keys?
- Why is "permission denied" Returned When I Run the KEYS Command in Web CLI?
- How Do I Disable High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
- Can I Configure Redis Keys to Be Case-Insensitive?
- Can I View the Most Frequently Used Redis Commands?
- Common Web CLI Errors
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 4.0 to 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instances Stopped or Restarted During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Can't I Modify Specifications for a DCS Redis/Memcached Instance?
- How Do I Reduce the Capacity of a DCS Instance?
- How Do I Handle an Error When I Use Lettuce to Connect to a Redis Cluster Instance After Specification Modification?
-
Monitoring and Alarm
- How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance?
- Does Redis Support Command Audits?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- Why Is Used Memory Greater Than Available Memory?
- Why Does Bandwidth Usage Exceed 100%?
- Why Is the Rejected Connections Metric Displayed?
- Why Is Flow Control Triggered? How Do I Handle It?
-
Data Backup, Export, and Migration
- How Do I Export DCS Redis Instance Data?
- Can I Export Backup Data of DCS Redis Instances to RDB Files Using the Console?
- Why Are Processes Frequently Killed During Data Migration?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- When Will AOF Rewrites Be Triggered?
- Can I Migrate Data to Multiple Target Instances in One Migration Task?
- How Do I Enable the SYNC and PSYNC Commands?
- Will the Same Keys Be Overwritten During Data Migration or Backup Import?
- Online Migration with Rump
- What Should I Consider When Transferring or Operating Data Between Different OSs?
- Can I Migrate Data from a Multi-DB Source Redis Instance to a Cluster DCS Redis Instance?
- How Can I Migrate Partial Data?
- What Are the Constraints and Precautions for Migrating Redis Data to a Cluster Instance?
- What Should I Consider for Online Migration?
- Can I Perform Online Migration Without Any Service Interruption?
- What If "Disconnecting timedout slave" and "overcoming of output buffer limits" Are Reported on the Source Instance During Online Migration?
- Why Is Memory of a DCS Redis Instance Unchanged After Data Migration Using Rump, Even If No Error Message Is Returned?
- Can I Migrate Data from a Lower Redis Version to a Higher One?
- How Do I Migrate Memcached Data?
- Big/Hot Key Analysis
- Master/Standby Switchover
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
- Troubleshooting
- Change History
-
Service Overview
- API Reference (Kuala Lumpur Region)
-
API Reference (Ankara Region)
- Before You Start
- API Overview
- Calling APIs
-
APIs V2 (Recommended)
- Lifecycle Management
- Instance Management
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Log Management
- Background Task Management
- Other APIs
- Outdated APIs (V1)
- Permissions Policies and Supported Actions
- Appendix
-
User Guide (Ankara Region)
- Service Overview
-
Getting Started
- Creating an Instance
-
Accessing an Instance
- Network Conditions for Accessing DCS Redis
- Accessing a DCS Redis Instance Through redis-cli
- Access in Different Languages
- Accessing a DCS Redis Instance on the Console
- Viewing Details of a DCS Instance
-
User Guide
- Permissions Management
- Operating DCS Instances
-
Managing DCS Instances
- Configuration Notice
- Modifying Configuration Parameters
- Modifying Maintenance Time Window
- Modifying the Security Group
- Viewing Background Tasks
- Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance
- Managing Shards and Replicas
- Analyzing Big Keys and Hot Keys
- Scanning and Deleting Expired Keys in a DCS Redis Instance
- Managing IP Address Whitelist
- Viewing Redis Run Logs
- Diagnosing an Instance
- Backing Up and Restoring DCS Instances
- Migrating Data with DCS
- Managing Passwords
- Monitoring
- Best Practices
-
FAQs
- Instance Types/Versions
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Access at EIPs?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
- Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0 and Later Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What If Redis Commands Are Incompatible with DCS for Redis?
- Does DCS for Redis Provide Backend Management Software?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
- Why Is "Error in execution" Returned When I Access Redis?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Disable High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 4.0 to 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instances Stopped or Restarted During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Can't I Modify Specifications for a DCS Redis Instance?
-
Monitoring and Alarm
- Does Redis Support Command Audits?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- Why Is Used Memory Greater Than Available Memory?
- Why Is Flow Control Triggered? How Do I Handle It?
-
Data Backup, Export, and Migration
- How Do I Export DCS Redis Instance Data?
- Can I Export Backup Data of DCS Redis Instances to RDB Files Using the Console?
- Why Are Processes Frequently Killed During Data Migration?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- When Will AOF Rewrites Be Triggered?
- Online Migration with Rump
-
Big/Hot Key Analysis and Expired Key Scan
- What Are Big Keys and Hot Keys?
- What Is the Impact of Big Keys or Hot Keys?
- How Do I Avoid Big Keys and Hot Keys?
- How Do I Analyze the Hot Keys of a DCS Redis 3.0 Instance?
- How Do I Detect Big Keys and Hot Keys in Advance?
- How Does DCS Delete Expired Keys?
- How Long Are Keys Stored? How Do I Set Key Expiration?
- Master/Standby Switchover
-
User Guide (ME-Abu Dhabi Region)
- General Reference
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Serializing Access to Frequently Accessed Resources
Overview
Application Scenario
In monolithic deployment, you can use Java concurrency APIs such as ReentrantLock or synchronized to implement mutual exclusion locks. This native lock mechanism provided by Java ensures that multiple threads within a Java VM process are executed concurrently and sequentially.
However, this mechanism may fail in multi-node deployment because a node's lock only takes effect on threads in the Java VM where the node runs. For example, the concurrency level in Internet seckills requires multiple nodes to run at the same time. Assume that requests of two users arrive simultaneously on two nodes. Although the requests can be processed simultaneously on the respective nodes, an inventory oversold problem may still occur because the nodes use different locks.
Solution
To serialize access to resources, ensure that all nodes use the same lock. This requires a distributed lock.
The idea of a distributed lock is to provide a globally unique "thing" for different systems to allocate locks. When a system needs a lock, it asks the "thing" for a lock. In this way, different systems can obtain the same lock.
Currently, a distributed lock can be implemented using cache databases, disk databases, or ZooKeeper.
Implementing distributed locks using DCS Redis instances has the following advantages:
- Simple operation: Locks can be acquired and released by using simple commands such as SET, GET, and DEL.
- High performance: Cache databases deliver higher read/write performance than disk databases and ZooKeeper.
- High reliability: DCS supports both master/standby and cluster instances, preventing single points of failure.
Implementing locks on distributed applications can avoid inventory oversold problems and nonsequential access. The following describes how to implement locks on distributed applications with Redis.
Prerequisites
- A DCS instance has been created, and is in the Running state.
- The network between the client server and the DCS instance is connected:
- When the client and the DCS Redis instance are in the same VPC:
By default, networks in a VPC can communicate with each other.
- When the client and the DCS Redis instance are in different VPCs in the same region:
If the client and DCS Redis instance are not in the same VPC, connect them by establishing a VPC peering connection. For details, see Does DCS Support Cross-VPC Access?
- To access a Redis instance of another region on a client
If the client server and the Redis instance are not in the same region, connect the network using Direct Connect. For details, see What Is Direct Connect.
- For public access
For details about how to access a DCS Redis 4.0/5.0/6.0 instance on a client over a public network, see Using Nginx for Public Access to DCS or Using ELB for Public Access to DCS.
- When the client and the DCS Redis instance are in the same VPC:
- You have installed JDK1.8 (or later) and a development tool (Eclipse is used as an example) on the client server, and downloaded the Jedis client.
The development tools and clients mentioned in this document are for example only.
Procedure
- Run Eclipse on the server and create a Java project. Then, create a distributed lock implementation class DistributedLock.java and a test class CaseTest.java for the example code, and reference the Jedis client as a library to the project.
Sample code of DistributedLock.java:
package dcsDemo01; import java.util.UUID; import redis.clients.jedis.Jedis; import redis.clients.jedis.params.SetParams; public class DistributedLock { // Address and port for connecting to the Redis instance. Replace them with the actual values. private final String host = "192.168.0.220"; private final int port = 6379; private static final String SUCCESS = "OK"; public DistributedLock(){} /* * @param lockName Lock name * @param timeout Timeout for acquiring locks * @param lockTimeout Validity period of locks * @return Lock ID */ public String getLockWithTimeout(String lockName, long timeout, long lockTimeout) { String ret = null; Jedis jedisClient = new Jedis(host, port); try { // Password for connecting to the Redis instance. Replace it with the actual value. String authMsg = jedisClient.auth("passwd"); if (!SUCCESS.equals(authMsg)) { System.out.println("AUTH FAILED: " + authMsg); } String identifier = UUID.randomUUID().toString(); String lockKey = "DLock:" + lockName; long end = System.currentTimeMillis() + timeout; SetParams setParams = new SetParams(); setParams.nx().px(lockTimeout); while(System.currentTimeMillis() < end) { String result = jedisClient.set(lockKey, identifier, setParams); if(SUCCESS.equals(result)) { ret = identifier; break; } try { Thread.sleep(2); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } catch (Exception e) { e.printStackTrace(); }finally { jedisClient.quit(); jedisClient.close(); } return ret; } /* * @param lockName Lock name * @param identifier Lock ID */ public void releaseLock(String lockName, String identifier) { Jedis jedisClient = new Jedis(host, port); try { String authMsg = jedisClient.auth("passwd"); if (!SUCCESS.equals(authMsg)) { System.out.println("AUTH FAILED: " + authMsg); } String lockKey = "DLock:" + lockName; if(identifier.equals(jedisClient.get(lockKey))) { jedisClient.del(lockKey); } } catch (Exception e) { e.printStackTrace(); }finally { jedisClient.quit(); jedisClient.close(); } } }
NOTICE:The code only shows how DCS implements access control using locks. During actual implementation, deadlock and lock check also need to be considered.
Assume that 20 threads are used to seckill ten Mate 10 mobile phones. The content of the test class CaseTest.java is as follows:package dcsDemo01; import java.util.UUID; public class CaseTest { public static void main(String[] args) { ServiceOrder service = new ServiceOrder(); for (int i = 0; i < 20; i++) { ThreadBuy client = new ThreadBuy(service); client.start(); } } } class ServiceOrder { private final int MAX = 10; DistributedLock DLock = new DistributedLock(); int n = 10; public void handleOder() { String userName = UUID.randomUUID().toString().substring(0,8) + Thread.currentThread().getName(); String identifier = DLock.getLockWithTimeout("Mate 10", 10000, 2000); System.out.println("Processing order for user " + userName + ""); if(n > 0) { int num = MAX - n + 1; System.out.println("User "+ userName + " is allocated number " + num + " mobile phone. Number of mobile phones left: " + (--n) + ""); }else { System.out.println("User "+ userName + " order failed."); } DLock.releaseLock("Mate 10", identifier); } } class ThreadBuy extends Thread { private ServiceOrder service; public ThreadBuy(ServiceOrder service) { this.service = service; } @Override public void run() { service.handleOder(); } }
- Configure the connection address, port number, and password of the DCS instance in the example code file DistributedLock.java.
In DistributedLock.java, set host and port to the connection address and port number of the instance. In the getLockWithTimeout and releaseLock methods, set passwd to the instance access password.
- Comment out the lock part in the test class CaseTest. The following is an example:
//The lock code is commented out in the test class: public void handleOder() { String userName = UUID.randomUUID().toString().substring(0,8) + Thread.currentThread().getName(); //Lock code //String identifier = DLock.getLockWithTimeout("Mate 10", 10000, 2000); System.out.println("Processing order for user " + userName + ""); if(n > 0) { int num = MAX - n + 1; System.out.println("User "+ userName + " is allocated number " + num + " mobile phone. Number of mobile phones left: " + (--n) + ""); }else { System.out.println("User "+ userName + " order failed."); } //Lock code //DLock.releaseLock("Mate 10", identifier); }
- Compile and run a lock-free class. The purchases are disordered, as shown in the following:
Processing order for user e04934ddThread-5 Processing order for user a4554180Thread-0 User a4554180Thread-0 is allocated number 2 mobile phone. Number of mobile phones left: 8. Processing order for user b58eb811Thread-10 User b58eb811Thread-10 is allocated number 3 mobile phone. Number of mobile phones left: 7. Processing order for user e8391c0eThread-19 Processing order for user 21fd133aThread-13 Processing order for user 1dd04ff4Thread-6 User 1dd04ff4Thread-6 is allocated number 6 mobile phone. Number of mobile phones left: 4. Processing order for user e5977112Thread-3 Processing order for user 4d7a8a2bThread-4 User e5977112Thread-3 is allocated number 7 mobile phone. Number of mobile phones left: 3. Processing order for user 18967410Thread-15 User 18967410Thread-15 is allocated number 9 mobile phone. Number of mobile phones left: 1. Processing order for user e4f51568Thread-14 User 21fd133aThread-13 is allocated number 5 mobile phone. Number of mobile phones left: 5. User e8391c0eThread-19 is allocated number 4 mobile phone. Number of mobile phones left: 6. Processing order for user d895d3f1Thread-12 User d895d3f1Thread-12 order failed. Processing order for user 7b8d2526Thread-11 User 7b8d2526Thread-11 order failed. Processing order for user d7ca1779Thread-8 User d7ca1779Thread-8 order failed. Processing order for user 74fca0ecThread-1 User 74fca0ecThread-1 order failed. User e04934ddThread-5 is allocated number 1 mobile phone. Number of mobile phones left: 9. User e4f51568Thread-14 is allocated number 10 mobile phone. Number of mobile phones left: 0. Processing order for user aae76a83Thread-7 User aae76a83Thread-7 order failed. Processing order for user c638d2cfThread-2 User c638d2cfThread-2 order failed. Processing order for user 2de29a4eThread-17 User 2de29a4eThread-17 order failed. Processing order for user 40a46ba0Thread-18 User 40a46ba0Thread-18 order failed. Processing order for user 211fd9c7Thread-9 User 211fd9c7Thread-9 order failed. Processing order for user 911b83fcThread-16 User 911b83fcThread-16 order failed. User 4d7a8a2bThread-4 is allocated number 8 mobile phone. Number of mobile phones left: 2.
- Add the lock code back to CaseTest, and compile and run the code. The following shows sequential purchases:
Processing order for user eee56fb7Thread-16 User eee56fb7Thread-16 is allocated number 1 mobile phone. Number of mobile phones left: 9. Processing order for user d6521816Thread-2 User d6521816Thread-2 is allocated number 2 mobile phone. Number of mobile phones left: 8. Processing order for user d7b3b983Thread-19 User d7b3b983Thread-19 is allocated number 3 mobile phone. Number of mobile phones left: 7. Processing order for user 36a6b97aThread-15 User 36a6b97aThread-15 is allocated number 4 mobile phone. Number of mobile phones left: 6. Processing order for user 9a973456Thread-1 User 9a973456Thread-1 is allocated number 5 mobile phone. Number of mobile phones left: 5. Processing order for user 03f1de9aThread-14 User 03f1de9aThread-14 is allocated number 6 mobile phone. Number of mobile phones left: 4. Processing order for user 2c315ee6Thread-11 User 2c315ee6Thread-11 is allocated number 7 mobile phone. Number of mobile phones left: 3. Processing order for user 2b03b7c0Thread-12 User 2b03b7c0Thread-12 is allocated number 8 mobile phone. Number of mobile phones left: 2. Processing order for user 75f25749Thread-0 User 75f25749Thread-0 is allocated number 9 mobile phone. Number of mobile phones left: 1. Processing order for user 26c71db5Thread-18 User 26c71db5Thread-18 is allocated number 10 mobile phone. Number of mobile phones left: 0. Processing order for user c32654dbThread-17 User c32654dbThread-17 order failed. Processing order for user df94370aThread-7 User df94370aThread-7 order failed. Processing order for user 0af94cddThread-5 User 0af94cddThread-5 order failed. Processing order for user e52428a4Thread-13 User e52428a4Thread-13 order failed. Processing order for user 46f91208Thread-10 User 46f91208Thread-10 order failed. Processing order for user e0ca87bbThread-9 User e0ca87bbThread-9 order failed. Processing order for user f385af9aThread-8 User f385af9aThread-8 order failed. Processing order for user 46c5f498Thread-6 User 46c5f498Thread-6 order failed. Processing order for user 935e0f50Thread-3 User 935e0f50Thread-3 order failed. Processing order for user d3eaae29Thread-4 User d3eaae29Thread-4 order failed.
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