#ceph IRC Log

Index

IRC Log for 2011-05-27

Timestamps are in GMT/BST.

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[7:12] <sage> bchrisman: did the locking fix work for you guys?
[7:13] <bchrisman> haven't had a chance to test it because we haven't been keeping up on kernels. That's on our todo list though.
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[19:28] <cmccabe> so I'm trying to upstream these hadoop changes to CephTalker
[19:29] <cmccabe> and the rest of that code
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[19:29] <cmccabe> but I'm confused because CephTalker.java and the other stuff doesn't seem to be included in upstream Hadoop
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[20:05] <Tv> cmccabe: well any jar can provide a hadoop filesystem implementation, so it doesn't *have* to be upstream
[20:05] <Tv> dunno if it was in, and got removed at some point
[20:05] <gregaf> yeah, we've been talking about it offline
[20:05] <Tv> look at the commit log perhaps?
[20:05] <cmccabe> tv: it looks like we tried to get it upstreamed, but it never quite stuck
[20:05] <gregaf> it never got upstreamed
[20:06] <Tv> the world might be better off not having it upstream, honestly
[20:06] <gregaf> due to a combination of their requirements and my inability to figure out their Jira system
[20:06] <Tv> hahahaa
[20:06] <Tv> gregaf: apache projects are lovely, aren't they ;)
[20:06] <gregaf> I'm pretty sure it satisfies their requirements in the latest iteration but Jira combined with apathy on the part of various people was too much of a hurdle
[20:07] <gregaf> anyway, it was deliberately designed so that the Java code would be stable and any Ceph bits that needed to change would be handled by the JNI library, which was never supposed to go in-tree
[20:07] <cmccabe> tv: you think the bureaucracy of having it upstream might be frustrating?
[20:08] <cmccabe> tv: mostly I just want to run a quick test or two to make sure that this thing works at all
[20:08] <Tv> cmccabe: well, they intentionally made that a plugin mechanism
[20:08] <Tv> there's no need to upstream all the plugins
[20:08] <Tv> cmccabe: you just provide it in classpath and state the name of the class that implements the fs
[20:09] <cmccabe> tv: normally this is the point where I would indignantly point out the benefits of having more people test the code once it's upstreamed
[20:09] <cmccabe> tv: however, when building Hadoop, I got a build error when building head-of-line
[20:09] <cmccabe> tv: which I had to manually add symlinks to the build tree to fix
[20:09] <cmccabe> tv: also it appears the testing framework is very spotty, so...
[20:09] <Tv> cmccabe: except no upstream hadoop person uses ceph.. compiling != testing
[20:10] <cmccabe> tv: compiling the java part would at least keep that from bitrotting
[20:11] <Tv> true, but if it did bitrot, upstream would be very apathetic about it anyway, so it might just get removed
[20:11] <cmccabe> heh
[20:11] <Tv> but i'm not strongly arguing against
[20:12] <cmccabe> we do have somewhat of a problem with APIs rotting
[20:12] <Tv> just saying, users need libceph & the jni c layer anyway, and those won't be upstream hadoop anyway, ...
[20:12] <gregaf> we'd like people to use it in Hadoop upstream, and there's been various interest in it from various people over the years
[20:12] <cmccabe> like the python bindings have been broken several times-- by me, mostly, but sometimes by others
[20:12] <Tv> cmccabe: because we don't really use them?
[20:12] <gregaf> and the Hadoop FS interface at least when I wrote it was undergoing a lot of change, so getting it upstream would lift the silly maintenance burden from us
[20:12] <cmccabe> well, obsync uses them.
[20:13] <cmccabe> I was hoping there would be more tests written in python that would use the python bindings, but they haven't materialized yet
[20:13] <cmccabe> anyway, the same problem exists for the PHP bindings and probably all the bindings really
[20:14] <Tv> the reason why php bindings in ceph rot == the reason why ceph bindings in hadoop would rot, too ;)
[20:14] <Tv> if you don't use it, it goes into Schrodinger existence
[20:14] <cmccabe> Hadoop seems like a nice use case for a filesystem still in developement because it doesn't require "permanent" storage
[20:14] <Tv> it might be dead, you won't know until you observe it under real usage
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[23:34] <sagewk> let's do a standup in 5
[23:35] <cmccabe> ok
[23:38] <sagewk> bchrisman: you guys around?
[23:39] <bchrisman> sagewk: interviewing candidate...
[23:39] <sagewk> k
[23:40] <sagewk> maybe ping me later, wanted to check in about the locking thing
[23:40] <bchrisman> cool
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