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Re: [Moosefs-users] Lost all metadata on master w/ full disk
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From: Davies L. <dav...@gm...> - 2011-11-08 10:14:34
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I have made a patch to solve this, at attached. On Tue, Nov 8, 2011 at 5:42 PM, Davies Liu <dav...@gm...> wrote: > In the mfsmaster, when dumping data to disk, it rename metadata.mfs.back > to metadata.mfs.back.tmp first, then write to metadata.mfs.back, finally, it > unlink metadata.mfs.back.tmp and metadata.mfs. > > If writing to metadata.mfs.back failed, we will get part of metadata, or damaged > one, and previous metadata will be lost together. > > Why not writing to metadata.mfs.back.tmp first, if successfully, then rename it > to metadata.mfs.back, and delete metadata.mfs ? I think this way is much safer. > > In the metalogger, it does not check the downloaded metadata, if it download a > damaged one, then all the metadata will be lost. let metalogger keep sereral > recently metadata may be safer. > > I will try to fix the above in my deployments, losing metadata is > TOO UNACCEPTABLE. > > On Tue, Nov 8, 2011 at 7:24 AM, Nolan Eakins <no...@ea...> wrote: >> I have a little server setup to give MooseFS a try. This server ran >> out of disk space on its root partition a day or two ago. This >> partition is where mfsmaster stored all of its data. Needless to say, >> mfsmaster did something dumb and zeroed out all the metadata files >> under /var/lib/mfs. It even looks like the metadata logger on another >> machine was affected since it didn't store anything recoverable. >> >> So my entire moosefs file tree is completely hosed now, all because >> mfsmaster can't handle a full disk. >> >> Other than this, I've been happy with MooseFS. >> >> Regards, >> Nolan >> >> ------------------------------------------------------------------------------ >> RSA(R) Conference 2012 >> Save $700 by Nov 18 >> Register now >> http://p.sf.net/sfu/rsa-sfdev2dev1 >> _______________________________________________ >> moosefs-users mailing list >> moo...@li... >> https://lists.sourceforge.net/lists/listinfo/moosefs-users >> > > > > -- > - Davies > -- - Davies |
