Why Am I Seeing a Timeout Error When Reading Data from Redis?
Symptom
When you read data from Redis, timeout error "redis server response timeout (3000ms) occurred after 3 retry attempts" is returned.
Troubleshooting
- Increase the timeout based on the error information.
- Check whether the error is returned after an operation is performed on a big key. It is recommended that the key size be no greater than 10 KB.
Redis limits the size of each String value to 512 MB. In actual development, keep the size within 10 KB. Otherwise, the CPU and NIC will be heavily loaded.
Keep the number of Hashes, Lists, Sets, or Zsets within 5000.
Theoretically, the number of elements in each HashSet should be fewer than 2^32.
- Increase the value of parameter PingConnectionInterval based on the error information.
Redis Usage FAQs
- 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 Does It Take a Long Time to Start a Cluster DCS Instance?
- What Should I Do If an Error Occurs in redis_exporter?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Deleted Data of a DCS Instance?
- 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?
- What Are the Constraints on Implementing Multi-DB on a Proxy Cluster Instance?
- How Do I Create a Multi-DB Proxy Cluster Instance?
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