Thursday, 2018-05-24

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bhagyashrisjamielennox: Hi09:46
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eanderssonWhats the general experience with having keystone (and keystone_authtoken) pointing at multiple memcached servers, as opposed at only pointing it at localhost?16:06
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kmalloceandersson: memcache does some odd things based upon how the keys are spread across the pool (sharding). It is absolutely not replicated data, but it increases your overall capacity and could handle the case where a memcache server is down, but you could have a lot of misses if you lose the cache server or it flaps in/out16:27
kmalloceandersson: keystonemiddleware should be shared among the services [e.g. nova, glance, cinder, etc should be pointed to the same memcache server(s)]. This is because nova token validation can then cache the token (for example) before glance tries to validate it16:28
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kmalloceandersson: for the most part, memcache (local) is sufficient. though a shared pool among your control plane should help avoid as much cache-warm time/request needs. [not needing 3 hits for a keystone value to be cached]16:30
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kmallocother backends to dogpile can replicate among the pool (iirc redis can do this), providing more assurance of cache-hit in the case of a down/flapping/otherwise memcache server16:30
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eanderssonkmalloc, cool pretty much my view on it16:58
eanderssonor reasoning rather16:58
eanderssonDuring one of the talks they highly recommended to not do sharding16:58
kmallocYeah, I typically don't recommend sharding unless you know what the heck you're doing.16:59
kmallocIf you know what you're doing, then the guidance I am going to provide is less relevant, because I don't know the specifics in your deployment :)16:59
eanderssonYea... our... setup is a snowflake...17:00
kmallocMost folks don't really understand the pitfalls and concerns with stuff like sharding memcache, so always recommend "don't"17:00
kmallocToo many ways to cause weird issues.17:01
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eanderssonThanks kmalloc, btw you at the conference?17:04
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kmallocYep! In the extended maintenance session right now, hiding in the front corner next to the table.17:05
kmallocYou?17:05
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eanderssonMy passport expired and couldn't renew it on time :'( but my colleagues are17:06
eanderssonWas hoping to hear about the new edge keystone17:06
kmallocDamn, well maybe Denver or Berlin! :)17:06
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openstackgerritRaildo Mascena proposed openstack/keystone master: [WIP] - Exposing bug/1754677  https://review.openstack.org/57043820:18
openstackgerritColleen Murphy proposed openstack/keystonemiddleware master: Don't rely on pbr ChangeLog for docs  https://review.openstack.org/57044820:38
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morgan.21:03
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hrybacki.21:20
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