Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 15 second(s) at

This error message indicates that a Redis command took longer than the specified timeout value to complete. It might be caused by a slow network connection, a high Redis server load, or a Redis configuration issue. To fix this, you can try increasing the timeout value, optimizing your network settings, or optimizing your Redis configuration. Additionally, you may want to consult your Redis logs or contact Redis support for further assistance.

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Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 12 second(s)

This error message indicates that a Redis command has taken too long to execute and has timed out. The timeout duration in this case is 12 seconds.

There are a few potential reasons why this error might occur:

1. The Redis server is overloaded or experiencing high traffic, causing commands to take longer than usual to execute. This can be resolved by optimizing the Redis server and/or increasing its resources.

2. The command being executed is particularly complex or resource-intensive, causing it to take longer than the timeout duration. In this case, you may need to optimize the command or increase the timeout duration to accommodate it.

3. There is a network issue or connectivity problem between the client and the Redis server, causing delays or timeouts. You may need to troubleshoot your network infrastructure to resolve this issue.

To resolve this error, you can try the following:

- Increase the timeout duration for Redis commands to allow for longer execution times.
- Optimize the Redis server to improve performance and reduce command execution times.
- Troubleshoot any network or connectivity issues that may be causing delays or timeouts.

org.springframework.dao.QueryTimeoutException: Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 3 second(s)

这个错误通常是由于 Redis 命令执行时间过长而导致的超时异常。可以考虑增加 Redis 的超时时间或者优化 Redis 命令的执行效率来解决这个问题。同时，也可以检查 Redis 服务器的负载情况，以确定是否需要增加 Redis 实例的数量来提高性能。另外，也可以考虑使用 Redis Sentinel 或者 Redis Cluster 进行高可用和负载均衡。