Joe Julian
2015-Jan-26 22:04 UTC
[Gluster-users] Pretty much any operation related to Gluster mounted fs hangs for a while
Nothing but GlusterFS should be writing to bricks. Mount a client and write there. On 01/26/2015 01:38 PM, Tiago Santos wrote:> Right. > > I have Brick1 being constantly written. But I have nothing writing on > Brick2. It just get "healed" data from Brick1. > > This setup is still not in production, and there's no applications > using that data. I have rsyncs constantly updating Brick1 (bring data > from production servers), and then Gluster updates Brick2. > > Which makes me wonder how may I be creating multiple replicas during a > split-brain. > > > It may be the case that, having a split-brain event, I may be updating > versions of the same file on Brick1 (only), and Gluster understands it > as different versions and things get confuse? > > > Anyways, while we talk I'm gonna run Joe's precious procedure on > split-brain recovery. > > > > > > On Mon, Jan 26, 2015 at 7:23 PM, Joe Julian <joe at julianfamily.org > <mailto:joe at julianfamily.org>> wrote: > > Mismatched GFIDs would happen if a file is created on multiple > replicas during a split-brain event. The GFID is assigned at file > creation. > > > On 01/26/2015 01:04 PM, A Ghoshal wrote: > > Yep, so it is indeed a split-brain caused by a mismatch of the > trusted.gfid attribute. > > Sadly, I don't know precisely what causes it. -Communication > loss might be one of the triggers. I am guessing the files > with the problem are dynamic, correct? In our setup (also > replica 2), communication is never a problem but we do see > this when one of the server takes a reboot. Maybe some obscure > and difficult to understand race between background self-heal > and the self heal daemon... > > In any case, a normal procedure for split brain recovery would > work for you if you wish to get you files back in function. > It's easy to find on google. I use the instructions on Joe > Julian's blog page myself. > > > -----Tiago Santos <tiago at musthavemenus.com > <mailto:tiago at musthavemenus.com>> wrote: ----- > > ======================> To: A Ghoshal <a.ghoshal at tcs.com <mailto:a.ghoshal at tcs.com>> > From: Tiago Santos <tiago at musthavemenus.com > <mailto:tiago at musthavemenus.com>> > Date: 01/27/2015 02:11AM > Cc: gluster-users <gluster-users at gluster.org > <mailto:gluster-users at gluster.org>> > Subject: Re: [Gluster-users] Pretty much any operation > related to Gluster mounted fs hangs for a while > ======================> Oh, right! > > Follow the outputs: > > > root at web3:/export/images1-1/brick# time getfattr -m . -d -e hex > templates/assets/prod/temporary/13/user_1339200.png > # file: templates/assets/prod/temporary/13/user_1339200.png > trusted.afr.site-images-client-0=0x000000000000000400000000 > trusted.afr.site-images-client-1=0x000000020000000900000000 > trusted.gfid=0x10e5894c474a4cb1898b71e872cdf527 > > real 0m0.024s > user 0m0.001s > sys 0m0.001s > > > > root at web4:/export/images2-1/brick# time getfattr -m . -d -e hex > templates/assets/prod/temporary/13/user_1339200.png > # file: templates/assets/prod/temporary/13/user_1339200.png > trusted.afr.site-images-client-0=0x000000000000000000000000 > trusted.afr.site-images-client-1=0x000000000000000000000000 > trusted.gfid=0xd02f14fcb6724ceba4a330eb606910f3 > > real 0m0.003s > user 0m0.000s > sys 0m0.006s > > > Not sure exactly what that means. I'm googling, and would > appreciate if you > guys can bring some light. > > Thanks! > -- > Tiago > > > > > On Mon, Jan 26, 2015 at 6:16 PM, A Ghoshal <a.ghoshal at tcs.com > <mailto:a.ghoshal at tcs.com>> wrote: > > Actually you ran getfattr on the volume - which is why the > requisite > extended attributes never showed up... > > Your bricks are mounted elsewhere. > /exports/images1-1/brick, and exports/images2-1/brick > > Btw, what version of Linux do you use? And, are the files > you observe the > input/output errors on soft-links? > > -----Tiago Santos <tiago at musthavemenus.com > <mailto:tiago at musthavemenus.com>> wrote: ----- > > ======================> To: A Ghoshal <a.ghoshal at tcs.com <mailto:a.ghoshal at tcs.com>> > From: Tiago Santos <tiago at musthavemenus.com > <mailto:tiago at musthavemenus.com>> > Date: 01/27/2015 12:20AM > Cc: gluster-users <gluster-users at gluster.org > <mailto:gluster-users at gluster.org>> > Subject: Re: [Gluster-users] Pretty much any operation > related to Gluster > mounted fs hangs for a while > ======================> Thanks for you input, Anirban. > > I ran the commands on both servers, with the following > results: > > > root at web3:/var/www/site-images# time getfattr -m . -d -e hex > templates/assets/prod/temporary/13/user_1339200.png > > real 0m34.524s > user 0m0.004s > sys 0m0.000s > > > root at web4:/var/www/site-images# time getfattr -m . -d -e hex > templates/assets/prod/temporary/13/user_1339200.png > getfattr: > templates/assets/prod/temporary/13/user_1339200.png: > Input/output > error > > real 0m11.315s > user 0m0.001s > sys 0m0.003s > root at web4:/var/www/site-images# ls > templates/assets/prod/temporary/13/user_1339200.png > ls: cannot access > templates/assets/prod/temporary/13/user_1339200.png: > Input/output error > > > =====-----=====-----====> Notice: The information contained in this e-mail > message and/or attachments to it may contain > confidential or privileged information. If you are > not the intended recipient, any dissemination, use, > review, distribution, printing or copying of the > information contained in this e-mail message > and/or attachments to it are strictly prohibited. If > you have received this communication in error, > please notify us by reply e-mail or telephone and > immediately and permanently delete the message > and any attachments. Thank you > > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> > http://www.gluster.org/mailman/listinfo/gluster-users > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> > http://www.gluster.org/mailman/listinfo/gluster-users > > > > > -- > *Tiago Santos* > MustHaveMenus.com-------------- next part -------------- An HTML attachment was scrubbed... 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Tiago Santos
2015-Jan-26 22:12 UTC
[Gluster-users] Pretty much any operation related to Gluster mounted fs hangs for a while
That's what I meant. Sorry for the confusion. I'm writing on Client1 (same server as Brick1). Client2 (mounted Brick2, on server2) has nothing writing to it (so far). My wondering is how I went up on having a split-brain if I'm only writing on one client. On Mon, Jan 26, 2015 at 8:04 PM, Joe Julian <joe at julianfamily.org> wrote:> Nothing but GlusterFS should be writing to bricks. Mount a client and > write there. > > > On 01/26/2015 01:38 PM, Tiago Santos wrote: > > Right. > > I have Brick1 being constantly written. But I have nothing writing on > Brick2. It just get "healed" data from Brick1. > > This setup is still not in production, and there's no applications using > that data. I have rsyncs constantly updating Brick1 (bring data from > production servers), and then Gluster updates Brick2. > > Which makes me wonder how may I be creating multiple replicas during a > split-brain. > > > It may be the case that, having a split-brain event, I may be updating > versions of the same file on Brick1 (only), and Gluster understands it as > different versions and things get confuse? > > > Anyways, while we talk I'm gonna run Joe's precious procedure on > split-brain recovery. > > > > > > On Mon, Jan 26, 2015 at 7:23 PM, Joe Julian <joe at julianfamily.org> wrote: > >> Mismatched GFIDs would happen if a file is created on multiple replicas >> during a split-brain event. The GFID is assigned at file creation. >> >> >> On 01/26/2015 01:04 PM, A Ghoshal wrote: >> >>> Yep, so it is indeed a split-brain caused by a mismatch of the >>> trusted.gfid attribute. >>> >>> Sadly, I don't know precisely what causes it. -Communication loss might >>> be one of the triggers. I am guessing the files with the problem are >>> dynamic, correct? In our setup (also replica 2), communication is never a >>> problem but we do see this when one of the server takes a reboot. Maybe >>> some obscure and difficult to understand race between background self-heal >>> and the self heal daemon... >>> >>> In any case, a normal procedure for split brain recovery would work for >>> you if you wish to get you files back in function. It's easy to find on >>> google. I use the instructions on Joe Julian's blog page myself. >>> >>> >>> -----Tiago Santos <tiago at musthavemenus.com> wrote: ----- >>> >>> ======================>>> To: A Ghoshal <a.ghoshal at tcs.com> >>> From: Tiago Santos <tiago at musthavemenus.com> >>> Date: 01/27/2015 02:11AM >>> Cc: gluster-users <gluster-users at gluster.org> >>> Subject: Re: [Gluster-users] Pretty much any operation related to >>> Gluster mounted fs hangs for a while >>> ======================>>> Oh, right! >>> >>> Follow the outputs: >>> >>> >>> root at web3:/export/images1-1/brick# time getfattr -m . -d -e hex >>> templates/assets/prod/temporary/13/user_1339200.png >>> # file: templates/assets/prod/temporary/13/user_1339200.png >>> trusted.afr.site-images-client-0=0x000000000000000400000000 >>> trusted.afr.site-images-client-1=0x000000020000000900000000 >>> trusted.gfid=0x10e5894c474a4cb1898b71e872cdf527 >>> >>> real 0m0.024s >>> user 0m0.001s >>> sys 0m0.001s >>> >>> >>> >>> root at web4:/export/images2-1/brick# time getfattr -m . -d -e hex >>> templates/assets/prod/temporary/13/user_1339200.png >>> # file: templates/assets/prod/temporary/13/user_1339200.png >>> trusted.afr.site-images-client-0=0x000000000000000000000000 >>> trusted.afr.site-images-client-1=0x000000000000000000000000 >>> trusted.gfid=0xd02f14fcb6724ceba4a330eb606910f3 >>> >>> real 0m0.003s >>> user 0m0.000s >>> sys 0m0.006s >>> >>> >>> Not sure exactly what that means. I'm googling, and would appreciate if >>> you >>> guys can bring some light. >>> >>> Thanks! >>> -- >>> Tiago >>> >>> >>> >>> >>> On Mon, Jan 26, 2015 at 6:16 PM, A Ghoshal <a.ghoshal at tcs.com> wrote: >>> >>> Actually you ran getfattr on the volume - which is why the requisite >>>> extended attributes never showed up... >>>> >>>> Your bricks are mounted elsewhere. >>>> /exports/images1-1/brick, and exports/images2-1/brick >>>> >>>> Btw, what version of Linux do you use? And, are the files you observe >>>> the >>>> input/output errors on soft-links? >>>> >>>> -----Tiago Santos <tiago at musthavemenus.com> wrote: ----- >>>> >>>> ======================>>>> To: A Ghoshal <a.ghoshal at tcs.com> >>>> From: Tiago Santos <tiago at musthavemenus.com> >>>> Date: 01/27/2015 12:20AM >>>> Cc: gluster-users <gluster-users at gluster.org> >>>> Subject: Re: [Gluster-users] Pretty much any operation related to >>>> Gluster >>>> mounted fs hangs for a while >>>> ======================>>>> Thanks for you input, Anirban. >>>> >>>> I ran the commands on both servers, with the following results: >>>> >>>> >>>> root at web3:/var/www/site-images# time getfattr -m . -d -e hex >>>> templates/assets/prod/temporary/13/user_1339200.png >>>> >>>> real 0m34.524s >>>> user 0m0.004s >>>> sys 0m0.000s >>>> >>>> >>>> root at web4:/var/www/site-images# time getfattr -m . -d -e hex >>>> templates/assets/prod/temporary/13/user_1339200.png >>>> getfattr: templates/assets/prod/temporary/13/user_1339200.png: >>>> Input/output >>>> error >>>> >>>> real 0m11.315s >>>> user 0m0.001s >>>> sys 0m0.003s >>>> root at web4:/var/www/site-images# ls >>>> templates/assets/prod/temporary/13/user_1339200.png >>>> ls: cannot access templates/assets/prod/temporary/13/user_1339200.png: >>>> Input/output error >>>> >>>> >>>> =====-----=====-----====>>> Notice: The information contained in this e-mail >>> message and/or attachments to it may contain >>> confidential or privileged information. If you are >>> not the intended recipient, any dissemination, use, >>> review, distribution, printing or copying of the >>> information contained in this e-mail message >>> and/or attachments to it are strictly prohibited. If >>> you have received this communication in error, >>> please notify us by reply e-mail or telephone and >>> immediately and permanently delete the message >>> and any attachments. Thank you >>> >>> >>> >>> _______________________________________________ >>> Gluster-users mailing list >>> Gluster-users at gluster.org >>> http://www.gluster.org/mailman/listinfo/gluster-users >>> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://www.gluster.org/mailman/listinfo/gluster-users >> > > > > -- > *Tiago Santos* > MustHaveMenus.com > > >-- *Tiago Santos* MustHaveMenus.com -------------- next part -------------- An HTML attachment was scrubbed... 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