We recently switched changeprop's redis servers from Redis 2.8 to Redis 3.2.

I noticed that there are differences in total memory consumption in between redis_jobqueue (Redis v2.8) and redis_misc (Redis v3.2):

eqiad redis_jobqueue ( Redis 2.8) was ~63 GB (3 redis masters):

https://grafana.wikimedia.org/dashboard/db/redis?orgId=1&from=1539711031726&to=1542388149112&var-datasource=eqiad%20prometheus%2Fops&var-job=redis_jobqueue

eqiad redis_misc (Redis 3.2) is ~9 GB (2 redis masters)

https://grafana.wikimedia.org/dashboard/db/redis?orgId=1&from=now-10d&to=now&var-datasource=eqiad%20prometheus%2Fops&var-job=redis_misc

codfw redis_jobqueue (Redis 2.8) ~55 GB

https://grafana.wikimedia.org/dashboard/db/redis?orgId=1&from=1539711031726&to=1542388149112&var-datasource=codfw%20prometheus%2Fops&var-job=redis_jobqueue

codfw redis_misc (Redis 3.2) ~75 GB

https://grafana.wikimedia.org/dashboard/db/redis?orgId=1&from=now-10d&to=now&var-datasource=codfw%20prometheus%2Fops&var-job=redis_misc

Things to consider:

• redis_jobqueue had cross-dc replication, redis_misc doesn't
• on codfw we have 6 scb servers while in eqiad we have 4
• redis_misc servers have more maxmemory than redis_jobqueue servers did
• this could probably be nothing:)