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bcwaldon | jeblair: when you get a chance, glance unit tests are failing due to too many links in /tmp | 05:35 |
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notmyname | justinsb: ping | 13:07 |
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jeblair | bcwaldon: thanks. cleaned them up. devananda has a fix in progress for that. | 15:45 |
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eglynn__ | jeblair: still around? | 17:47 |
eglynn__ | jeblair: could you re-enable GLANCE_TEST_S3_CONF & GLANCE_TEST_SWIFT_CONF for the glance builds in Jenkins? | 17:47 |
eglynn__ | (now that https://review.openstack.org/5466 has landed) | 17:47 |
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eglynn__ | jaypipes / bcwaldon: https://review.openstack.org/5487 should address the temp dir leakage that was borking /tmp on the Jenkins slaves | 17:48 |
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justinsb_ | notmyname: (Very delayed) ack | 23:12 |
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notmyname | justinsb_: still here? | 23:21 |
notmyname | justinsb_: I haven't looked at your code yet, but I wanted to run a related idea by you | 23:23 |
notmyname | (the swift ring changes) | 23:23 |
notmyname | justinsb_: if I don't catch you tonight, ping me sometime tomorrow | 23:29 |
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justinsb_ | notmyname: Stepped away for a minute, but I'm back! | 23:37 |
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justinsb_ | notmyname: I'm working on figuring out how to actually test changing the # replicas | 23:39 |
notmyname | justinsb_: have you heard of the idea to make replica placement in the zones "as unique as possible"? | 23:41 |
justinsb_ | notmyname: I think chmouel pointed me to it, but I didn't really see how to apply it | 23:42 |
notmyname | justinsb_: the idea is to keep N replicas (because you really do want that), but you can have as few as one zone. you then grow your cluster by adding zones (not replicas) | 23:43 |
notmyname | right now, swift places each replica in a unique zone and requires that you have at least as many zones as replicas. | 23:44 |
notmyname | this works fine from the medium to large case, but isn't very elegant for smaller clusters | 23:44 |
notmyname | (none of this should be taken as me opposed to exploring dynamic replica counts) | 23:45 |
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notmyname | justinsb_: I'm curious if you think that sort of change (the as unique as possible one) would work in your use case | 23:45 |
justinsb_ | notmyname: What I'd like to solve is the packaging problem - I'm trying to figure how we install the first server and then grow nicely to a properly redundant system | 23:45 |
justinsb_ | notmyname: It sounds like I'd still have to install multiple swift instances on my first box | 23:45 |
notmyname | no, you wouldn't | 23:45 |
notmyname | well, perhaps multiple processes, but just one of each (proxy, account, etc) | 23:46 |
justinsb_ | notmyname: So it would only store it once if there was only one zone? | 23:47 |
notmyname | what would happen is that the 3 replicas would go to the same zone/box/process | 23:47 |
notmyname | all 3 replicas would go to the first zone | 23:47 |
notmyname | of course, at that point the replicas aren't really doing much for you except taking up extra space | 23:47 |
notmyname | but it's a starting point for a larger cluster | 23:48 |
justinsb_ | notmyname: But as I added more machines it would rebalance, I presume | 23:48 |
notmyname | ya | 23:48 |
justinsb_ | notmyname: That does solve the packaging issue then | 23:48 |
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notmyname | and if you aren't planning on growing past the capabilities of one box, perhaps swift isn't the right storage solution (just use RAID and NFS or something similar) | 23:48 |
justinsb_ | notmyname: I'm coming at this from the point of view of e.g. what should apt-get do. | 23:49 |
justinsb_ | notmyname: I think you should be able to apt-get install swift and get a single node install that works | 23:49 |
notmyname | http://joearnold.com/swift-in-the-small/ | 23:49 |
notmyname | exampel of how to do small clusters with the current design ^ | 23:50 |
justinsb_ | notmyname: But then you should also be able to grow it from that point to a full swift install | 23:50 |
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justinsb_ | notmyname: I definitely agree that swift on one node isn't the best example of swift in action | 23:50 |
justinsb_ | notmyname: But it is nice to be able to use the same APIs etc | 23:51 |
notmyname | justinsb_: I don't really buy the argument that packaging should dictate design changes. swift is intended to be used in a distributed system. apt-get on one box doesn't really make sense | 23:51 |
notmyname | I do like the argument of starting from a small cluster and growing from there, though | 23:51 |
justinsb_ | I just want to see it being used, and a complicated installation process is a big barrier to that. | 23:52 |
justinsb_ | Even if we're not using the full capabilities on one box, I think it should be possible to get something up and running on one box | 23:52 |
notmyname | I'm a big fan of lowering barriers to entry :-) | 23:52 |
justinsb_ | Both incrementing the replica count and the 'as unique as possible' approach seem good to me | 23:53 |
notmyname | I don't like changing replica counts as much because it doesn't make sense in existing clusters of most any size | 23:53 |
Lumiere | packaging is meant as a configuration management tool as much as anything else | 23:54 |
notmyname | justinsb_: the replication bandwidth needed would be tremendous (I haven't read your code to see how you handle this yet) | 23:54 |
justinsb_ | notmyname: I can certainly see that you don't want to change replica count too often | 23:55 |
justinsb_ | notmyname: I haven't even tried it yet. I just reconfigure the ring and rely on the repair to fix things. I'm working on trying it now and seeing where it breaks! | 23:55 |
justinsb_ | notmyname: The 'as unique as possible' isn't going to be available for essex though, right? | 23:56 |
notmyname | correct | 23:56 |
notmyname | it's been attempted as a side project by one of the swift devs, but it hasn't been integrated into swift yet. | 23:57 |
notmyname | I'd give it better than 50% odds of being in folsom, though | 23:58 |
justinsb_ | notmyname: So are we suggesting that swift be packaged? You can apt-get it, but it won't work unless you have at least 3 machines and configure them together? | 23:58 |
justinsb_ | notmyname: Oops... "so how are we" ... | 23:59 |
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