On 2017-10-13 03:37 AM, Julien Danjou wrote: > On Fri, Oct 13 2017, Yaguang Tang wrote: > >> I see the latest Gnocchi support using Redis as a storage backend, I am >> testing performance of Redis and Ceph, it seems using Redis as storage >> backend we can achieve more realtime metric >> data, gnocchi status shows there is always few metric to process. >> >> Is Redis a recommend storage backend ? > > Redis is recommended as an incoming measures backend, not really as a > storage – though it really depends on the size of your installation. > > Up until 4.0 version, Gnocchi process metrics every > $metricd.metric_processing_delay seconds. With version 4.1 (to be > released), the Redis incoming driver has a more realtime processing > delay which avoids having to poll for incoming data. >
what Julien said :) redis as a storage driver really depends on how you setup persistence[1] and how much you trust it[2]. would love to see your redis vs ceph numbers compared to mine[3] :) [1] https://redis.io/topics/persistence [2] https://aphyr.com/posts/283-jepsen-redis [3] https://medium.com/@gord.chung/gnocchi-4-introspective-a83055e99776 (tested part of 4.1 optimisations) cheers, -- gord __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: [email protected]?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
