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On the master. There is that one AOF message, but that usually doesn't cause a failure.

Before that, the last message was the same but it was at 03:14. At 4:39:46, the system.io.wawait was averaging 3.91ms with an actual value of.81ms at 04:39:40. My redis data volume is RAID0 on AWS EBS storage with 2500 iops subscribed.

There's nothing going on on those disks at that time and the system io latency is being effected by a different volume altogether at the time. I'm not trying to be proactively defensive about it:-) I've just been trying to get rid of those messages, without success! (and they don't seem to bother redis too much, in practice - unless this is a problem here). 16335:S 23 Oct 04:39:53.023. SLAVE OF enabled (user request from 'id=5 addr=fd=10 name=sentinel-21af3b90-cmd age=494042 idle=0 flags=x db=0 sub=0psub=0 multi=3 qbuf=14 qbuf-free=32754 obl=36 oll=0 omem=0 events=rwcmd=exec')Note the 'name=sentinel' portion, part of the explanation of where the SLAVEOF command came from. This indicates you're running Sentinel to control your Redis master and slaves. Sentinel's function is to detect a master that has become unavailable and change one of the slaves to be the new master (and when the old master is available, change it to be a slave of the new master).So the action of master changing to a different server is what Sentinel is designed to do, and your logs indicate your Sentinel is doing it.

The reasons why Sentinel is changing the master should be found in the Sentinel logs. That's your best lead to the cause of the problem, and from there, the solution.hva.@gmail.com25.10.16 10:09. From the IP addresses in the logfile, it looks like your Redis and Sentinel daemons are on separate machines, which is good. They may even be in different subnets, which is fine.The best info is still in the Sentinel logs. Does it say it tried to connect to the master and the connection was refused? Does it say it connected and sent a command to the master, but didn't get a reply back before the timeout?There are usually just a few categories of problems that can make a monitoring system like Sentinel, running on a different server, believe the master has become unavailable:. The server becomes busy or frozen so the software running on it can't communicate.

This could happen on Redis servers or Sentinel servers. The network between the Sentinel servers and the master becomes clogged so the Sentinel commands and Redis replies are delayed or blocked.Your server performance graphing/monitoring will be able to confirm or deny that your Redis or Sentinel servers are experiencing slowness or brief freeze-ups. You'll have to add some monitoring to find out if the network between the Sentinels and Redis servers gets clogged or has hiccups.On Tuesday, October 25, 2016 at 10:09:23 AM UTC-7, David Geller wrote. On the master server you are indeed graphing the disk I/O statistics and those graphs show no writes during the AOF fsync?.

If you're really not seeing disk writes during the AOF fsync, that suggests a very severe problem between the virtual machine and its disk storage. Time to test the disk i/o. If you are seeing disk writes in the graphs, then Redis flushing all its data to disk is probably hitting the maximum I/O rate that's allowed to that disk storage. I.e., the disk performance is a bad enough bottleneck that Redis switches to the 'impatient' form of flushing data to disk, and as the log message indicates, this has a domino effect of making Redis respond very slowly to Sentinel's checks, which in turn triggers failover.

Time to check whether you're using a virtual server and storage type that's appropriate for the AOF rerwites. You may need to upgrade.

An alternative might be to move the AOF file to an additional slave machine that your app won't use and Sentinel won't promote to master.David Geller27.10.16 2:49. There's nothing going on wrt IO on the instances. When these AWS EBS volumes work, they work pretty well. It just seems like, at times, they falter inexplicably. I benchmarked the setup and squeezed the most I could out of them with RAID0. To upgrade these, I have to go with much larger drives and/or much larger instances. Yet, I've been able to get 300MB/s write throughput.

AWS docs are sparse when it comes to actual guaranteed latency. I've tried every different storage option and these io1 ssd's are the best. And yet maybe not good enough.Anyway, thanks for your time. I don't really need fsync on the master anyway. And, I'll take it up with Amazon.