config set maxmemory doesn't work under heavy traffic

[Travis Stark]

I believe I've found a bug and could use some advice on how to work around it. It is fairly easy to reproduce, write a little script that continuously reads from redis (in my case I'm calling hget inside a loop with a very short delay). While that is running, attempt to change the maxmemory setting. It will return "OK" but the value of the setting remains unchanged. 

127.0.0.1:6379> config get maxmemory

1) "maxmemory"

2) "1053568"

127.0.0.1:6379> config set maxmemory 20000000

OK

127.0.0.1:6379> config get maxmemory

1) "maxmemory"

2) "1053568"

I'm on version 3.2.6

[Jan-Erik Rediger]

It seems very unlikely like a bug.
Single commands in Redis are pretty much atomic. If it returns with a
success the code ran.
We use dynamic reconfiguration extensively and never ran into these
problems.

So please confirm:

* Make sure that no external process is resetting this value.
* Check the logs
* Check that all commands are actually sent to the right instance.

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[Itamar Haber]

Ref: https://www.reddit.com/r/redis/comments/69a9n0/has_anyone_seen_this_behavior_when_doing_config/

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