Sunday, 2010-11-07

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creihtjeremyb: I think the use case you have been discussing is a bit outside what swift was designed for01:46
creihtand re: 1k files, in general that would be bad for storage since XFS has a default block size of 4k + 1k inode (but you will have that same issue storing those files on any system)01:47
creihtNow you could possibly take parts of swift and build what you are talking about (or possible build on top of) but I think a lot of that is outside the designed use case of swift01:48
anotherjesse_creiht: what about 100GB files :) -- any thought to adding chunking at the API layer01:49
creihtanotherjesse_: We will be talking about that at the conference :)01:50
anotherjesse_creiht: awesome - spent a few hours with folks at various govt agencies doing science and this was their #1 request01:50
creihtAnd you know there is a nifty unix command named split right? :)01:50
anotherjesse_ORLY ;)  yeah I know - you can do it on client side, but thought is that it should be built into api01:51
creihtright now split and designing a naming scheme with marker queries will get you quite far01:51
creihtanotherjesse_: agreed01:51
anotherjesse_since it isn't a unique requirement01:51
creihtwow that last sentence didn't come out right at all01:51
creihttoo much sun at the airfield today01:51
anotherjesse_creiht: more generally, they were saddened with the state of existing object stores that only hit a single spindle per "replica" per file on upload01:52
creihtanotherjesse_: yeah devcamcar and I talked about it a bit01:52
anotherjesse_(seems amazon does something similar is what they were saying)01:52
creihtSo you can actually do that now01:53
anotherjesse_oh, cool, didn't realize devin gave you the download01:53
creihtkinda01:53
creihtsay you have a file name large_object.txt01:53
creihtyou could write a client script that uses the unix split command to split it into chunks of whatever size01:54
creihteach chunk would be named large_object.txt.01 .02 .03, etc.01:54
anotherjesse_and then parallelize the upload01:54
creihtyup01:54
creihtyou can get a listing of all the objects for large_object.txt by doing a prefix query (I think that is the right term) on large_object.txt01:54
anotherjesse_the use case we have seen is instruments producing information at GB/s or more - and wanting to push directly into object store01:54
creihtwhich would give you all the chunks, download them, and concat them back together01:55
anotherjesse_ya01:55
anotherjesse_I think we want to focus on geographic redundancy first - but if we can get the folks doing massive datasets to help improve swift it would be awesome01:56
creihtyeah01:56
creihtWe'll talk about all of that a lot more next week :)01:56
anotherjesse_looking forward to it01:56
creihtAnd it is also good for use to get requests for new features with actual use cases :)01:57
creihtis01:57
creihterm01:57
creihtus01:57
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mlannerhi, i've just installed swift for the first time. i followed the swift SAIO documentation. everything seemed to be going fine ... no errors along the way ... until i got to the very last statement, the probetest. while running the probetest the first time, it complained about 'user:group: in one file. i corrected a typo there, then ran it again. now, running both functest and probetest generate a ton of errors. anyone have05:30
mlannersuggestions what to look for?05:30
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mlannerk, nevermind. figured out my problem. had to delete all the .builder and .ring.gz and redo the entire last remakerings process again. it's all good now.06:20
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kim0Hi folks, I'm playing with the novascript, getting the following error at "run" stage13:47
kim0nova.exception.Error: volume group nova-volumes doesn't exist13:47
kim0although I attached a new disk "/dev/vdb" and created a LVM VG on that called "nova-volumes"13:47
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termiewhy does bzr even bother writing the "estimate" down when you are branching a remote repo13:53
termieit constantly changes, might as well be a windows progress bar13:53
kim0bah I have to actually create a LV for the VG dir to be created at /dev/%s .. ok13:55
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czajkowskikim0: aloha13:58
kim0czajkowski: hey ;)13:59
kim0I'm past the nova-volumes issue, however it seems now libvirt can't create an instance, getting:14:06
kim0libvirtError: internal error process exited while connecting to monitor: chardev: opening backend "file" failed14:06
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kim0cool .. problem resolved .. instance launched14:20
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xtoddxwho handles the hudson configs?  I'm curious as to the rules for building docs from nova source (is it using 'make html' or calling sphinx directly).17:54
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edayxtoddx: mtaylor does19:15
xtoddxeday: thanks19:15
xtoddxmtaylor: ^^^^ re: hudson sphinx config?19:16
edayxtoddx: looks like:19:21
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edayexport HUDSON_PUBLISH_DOCS=119:21
edaypython setup.py build_sphinx19:21
xtoddxhuh19:22
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mtaylorxtoddx: python setup.py build_sphinx23:04
mtaylorxtoddx: the HUDSON_PUBLISH_DOCS=1 is a hack to allow us to inject google analytics headers into the output for the ones we publish and to not have those headers wind up in anything that folks generate locally23:06
xtoddxcool, i think we've pretty much got everything working again in lp:~anso/nova/trunkdoc using setup.py instead of relying on make html23:07
mtaylorxtoddx: excellent23:09
mtaylorwhere did make html come from?23:09
xtoddxinitial sphinx setup make a makefile for you23:09
mtaylorah yes.23:10
mtaylorsorry - I thought I'd deleted that ages ago23:10
mtaylorxtoddx: what does your ext.autodoc do?23:11
xtoddxgenerates module documentation23:11
xtoddxby inspecting the source tree and generating .rst files that call automodule23:11
mtaylorcool23:11
* mtaylor has been meaning to write some sphinx extensions to do some similar things for the drizzle source... just hasn't gotten to it yet23:12
mtaylorso I may browse through what you did23:12
xtoddxhopefully this can be a start23:12
xtoddxpretty simple23:12
xtoddxright now we're working on getting FLAGS documentation auto generating23:13
mtaylorsweet23:13
mtaylorthat's a good idea23:13
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