[thomas_fa]

That's a lot of valuable information and thanks for the input. Yes the original blog post is mainly focusing on reducing the metadata overhead due to fsync(), and I got a lot of good feedback from here and a lot of discussion is beyond our original scenario settings. We would like to incorporate all these enhancement suggestions without re-introducing fsync(), and make it work for more general environments.

[gmokki]

Have you tried terminating the EC2 instances abruptly to test the resilience of your solution?

aws ec2 stop-instances \ --instance-ids i-12345678 \ --skip-os-shutdown