Error: redis hotkey problem
What's Causing This Error
A HotKey refers to a key in Redis that is accessed much more frequently than other keys, leading to increased CPU usage and node load. This can negatively impact the performance of other requests and decrease the success rate of the service.
The impacts of the HotKey issue are outlined as follows:
- Traffic becomes centralized and may reach the limit of physical network interface cards (NICs).
- Excessive requests can overload the cache service, potentially causing it to fail.
- The database can experience a breakdown, triggering a service disruption.
Solution - Here's How To Resolve It
To address the HotKey problem, the following steps are suggested:
- Consider HotKeys during the design phase to prevent their generation in the database.
- Implement caches on the service side to alleviate HotKey issues. It is recommended to use a multi-level cache approach, such as combining Redis with a local level-2 cache.
- Disable hotspot keys by configuring a whitelist for HotKeys on the service side. This allows specific HotKeys to be shielded as required.
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Other Common Redis Errors (with Solutions)
- could not connect to redis at 127.0.0.1:6379: connection refused
- redis error server closed the connection
- redis.exceptions.responseerror: value is not an integer or out of range
- redis.exceptions.responseerror moved
- redis.exceptions.responseerror noauth authentication required
- redis-server failed to start advanced key-value store
- spring boot redis unable to connect to localhost 6379
- unable to configure redis to keyspace notifications
- redis.clients.jedis.exceptions.jedismoveddataexception
- could not get resource from pool redis
- failed to restart redis service unit redis service not found
- job for redis-server.service failed because a timeout was exceeded
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