What is

Redis High CPU Usage

 ?
  1. Check Slow Log: Run SLOWLOG GET 10 to identify the top 10 slowest operations and see if any commands are taking an unusually long time to execute.
  2. Monitor with INFO Command: Execute INFO STATS and INFO CPU to check the current CPU usage and the number of commands being processed.
  3. Client List: Use CLIENT LIST to see if there's an unusual number of connections or specific clients sending a high volume of requests.
  4. Memory Usage: Check memory usage with INFO MEMORY to ensure there isn’t excessive memory pressure which might be causing swapping, indirectly affecting CPU.
  5. Monitor Command: Use MONITOR (with caution as it can increase load) to real-time monitor the requests being processed by the Redis server.
  6. Config Check: Run CONFIG GET maxclients and CONFIG GET *timeout* to ensure that connection settings are not leading to an unusual buildup of client connections.
  7. Key Space Analysis: Use redis-cli --bigkeys or SCAN (with a match and count option) commands to identify large keys or heavily utilized keys that might be contributing to high CPU usage.
  8. Latency Analysis: Execute LATENCY DOCTOR and LATENCY LATEST to identify and diagnose latency issues that might be related to CPU spikes.

Follow these actions sequentially to identify the root cause of high CPU usage in Redis.

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