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TLDR: AWS bug causing poor performance > AWS found that this Engine CPU saturation occurred because of a rare bug which is triggered when a client runs a high
by capableweb 4y ago
TLDR: AWS bug causing poor performance
> AWS found that this Engine CPU saturation occurred because of a rare bug which is triggered when a client runs a high Redis Publish / Subscribe load on a Cluster-Mode Enabled (CME) ElastiCache for Redis cluster. AWS is working to improve performance of Redis Publish / Subscribe on CME clusters.
Additionally, because of the reliance of cloud services instead of using their own instances (like EC2), troubleshooting became hard:
> When the first service disruption occurred, it was very difficult for us to isolate the root cause because we don’t have the ability to obtain CPU profiles from the underlying machines that run ElastiCache to see exactly what is consuming CPU time.