[Gluster-users] [Gluster-devel] missing files
Ben Turner
bturner at redhat.com
Thu Feb 5 22:22:26 UTC 2015
----- Original Message -----
> From: "David F. Robinson" <david.robinson at corvidtec.com>
> To: "Ben Turner" <bturner at redhat.com>
> Cc: "Pranith Kumar Karampuri" <pkarampu at redhat.com>, "Xavier Hernandez" <xhernandez at datalab.es>, "Benjamin Turner"
> <bennyturns at gmail.com>, gluster-users at gluster.org, "Gluster Devel" <gluster-devel at gluster.org>
> Sent: Thursday, February 5, 2015 5:01:13 PM
> Subject: Re: [Gluster-users] [Gluster-devel] missing files
>
> I'll send you the emails I sent Pranith with the logs. What causes these
> disconnects?
Thanks David! Disconnects happen when there are interruption in communication between peers, normally there is ping timeout that happens. It could be anything from a flaky NW to the system was to busy to respond to the pings. My initial take is more towards the ladder as rsync is absolutely the worst use case for gluster - IIRC it writes in 4kb blocks. I try to keep my writes at least 64KB as in my testing that is the smallest block size I can write with before perf starts to really drop off. I'll try something similar in the lab.
-b
> David (Sent from mobile)
>
> ===============================
> David F. Robinson, Ph.D.
> President - Corvid Technologies
> 704.799.6944 x101 [office]
> 704.252.1310 [cell]
> 704.799.7974 [fax]
> David.Robinson at corvidtec.com
> http://www.corvidtechnologies.com
>
> > On Feb 5, 2015, at 4:55 PM, Ben Turner <bturner at redhat.com> wrote:
> >
> > ----- Original Message -----
> >> From: "Pranith Kumar Karampuri" <pkarampu at redhat.com>
> >> To: "Xavier Hernandez" <xhernandez at datalab.es>, "David F. Robinson"
> >> <david.robinson at corvidtec.com>, "Benjamin Turner"
> >> <bennyturns at gmail.com>
> >> Cc: gluster-users at gluster.org, "Gluster Devel" <gluster-devel at gluster.org>
> >> Sent: Thursday, February 5, 2015 5:30:04 AM
> >> Subject: Re: [Gluster-users] [Gluster-devel] missing files
> >>
> >>
> >>> On 02/05/2015 03:48 PM, Pranith Kumar Karampuri wrote:
> >>> I believe David already fixed this. I hope this is the same issue he
> >>> told about permissions issue.
> >> Oops, it is not. I will take a look.
> >
> > Yes David exactly like these:
> >
> > data-brick02a-homegfs.log:[2015-02-03 19:09:34.568842] I
> > [server.c:518:server_rpc_notify] 0-homegfs-server: disconnecting
> > connection from
> > gfs02a.corvidtec.com-18563-2015/02/03-19:07:58:519134-homegfs-client-2-0-0
> > data-brick02a-homegfs.log:[2015-02-03 19:09:41.286551] I
> > [server.c:518:server_rpc_notify] 0-homegfs-server: disconnecting
> > connection from
> > gfs01a.corvidtec.com-12804-2015/02/03-19:09:38:497808-homegfs-client-2-0-0
> > data-brick02a-homegfs.log:[2015-02-03 19:16:35.906412] I
> > [server.c:518:server_rpc_notify] 0-homegfs-server: disconnecting
> > connection from
> > gfs02b.corvidtec.com-27190-2015/02/03-19:15:53:458467-homegfs-client-2-0-0
> > data-brick02a-homegfs.log:[2015-02-03 19:51:22.761293] I
> > [server.c:518:server_rpc_notify] 0-homegfs-server: disconnecting
> > connection from
> > gfs01a.corvidtec.com-25926-2015/02/03-19:51:02:89070-homegfs-client-2-0-0
> > data-brick02a-homegfs.log:[2015-02-03 20:54:02.772180] I
> > [server.c:518:server_rpc_notify] 0-homegfs-server: disconnecting
> > connection from
> > gfs01b.corvidtec.com-4175-2015/02/02-16:44:31:179119-homegfs-client-2-0-1
> >
> > You can 100% verify my theory if you can correlate the time on the
> > disconnects to the time that the missing files were healed. Can you have
> > a look at /var/log/glusterfs/glustershd.log? That has all of the healed
> > files + timestamps, if we can see a disconnect during the rsync and a self
> > heal of the missing file I think we can safely assume that the disconnects
> > may have caused this. I'll try this on my test systems, how much data did
> > you rsync? What size ish of files / an idea of the dir layout?
> >
> > @Pranith - Could bricks flapping up and down during the rsync cause the
> > files to be missing on the first ls(written to 1 subvol but not the other
> > cause it was down), the ls triggered SH, and thats why the files were
> > there for the second ls be a possible cause here?
> >
> > -b
> >
> >
> >> Pranith
> >>>
> >>> Pranith
> >>>> On 02/05/2015 03:44 PM, Xavier Hernandez wrote:
> >>>> Is the failure repeatable ? with the same directories ?
> >>>>
> >>>> It's very weird that the directories appear on the volume when you do
> >>>> an 'ls' on the bricks. Could it be that you only made a single 'ls'
> >>>> on fuse mount which not showed the directory ? Is it possible that
> >>>> this 'ls' triggered a self-heal that repaired the problem, whatever
> >>>> it was, and when you did another 'ls' on the fuse mount after the
> >>>> 'ls' on the bricks, the directories were there ?
> >>>>
> >>>> The first 'ls' could have healed the files, causing that the
> >>>> following 'ls' on the bricks showed the files as if nothing were
> >>>> damaged. If that's the case, it's possible that there were some
> >>>> disconnections during the copy.
> >>>>
> >>>> Added Pranith because he knows better replication and self-heal details.
> >>>>
> >>>> Xavi
> >>>>
> >>>>> On 02/04/2015 07:23 PM, David F. Robinson wrote:
> >>>>> Distributed/replicated
> >>>>>
> >>>>> Volume Name: homegfs
> >>>>> Type: Distributed-Replicate
> >>>>> Volume ID: 1e32672a-f1b7-4b58-ba94-58c085e59071
> >>>>> Status: Started
> >>>>> Number of Bricks: 4 x 2 = 8
> >>>>> Transport-type: tcp
> >>>>> Bricks:
> >>>>> Brick1: gfsib01a.corvidtec.com:/data/brick01a/homegfs
> >>>>> Brick2: gfsib01b.corvidtec.com:/data/brick01b/homegfs
> >>>>> Brick3: gfsib01a.corvidtec.com:/data/brick02a/homegfs
> >>>>> Brick4: gfsib01b.corvidtec.com:/data/brick02b/homegfs
> >>>>> Brick5: gfsib02a.corvidtec.com:/data/brick01a/homegfs
> >>>>> Brick6: gfsib02b.corvidtec.com:/data/brick01b/homegfs
> >>>>> Brick7: gfsib02a.corvidtec.com:/data/brick02a/homegfs
> >>>>> Brick8: gfsib02b.corvidtec.com:/data/brick02b/homegfs
> >>>>> Options Reconfigured:
> >>>>> performance.io-thread-count: 32
> >>>>> performance.cache-size: 128MB
> >>>>> performance.write-behind-window-size: 128MB
> >>>>> server.allow-insecure: on
> >>>>> network.ping-timeout: 10
> >>>>> storage.owner-gid: 100
> >>>>> geo-replication.indexing: off
> >>>>> geo-replication.ignore-pid-check: on
> >>>>> changelog.changelog: on
> >>>>> changelog.fsync-interval: 3
> >>>>> changelog.rollover-time: 15
> >>>>> server.manage-gids: on
> >>>>>
> >>>>>
> >>>>> ------ Original Message ------
> >>>>> From: "Xavier Hernandez" <xhernandez at datalab.es>
> >>>>> To: "David F. Robinson" <david.robinson at corvidtec.com>; "Benjamin
> >>>>> Turner" <bennyturns at gmail.com>
> >>>>> Cc: "gluster-users at gluster.org" <gluster-users at gluster.org>; "Gluster
> >>>>> Devel" <gluster-devel at gluster.org>
> >>>>> Sent: 2/4/2015 6:03:45 AM
> >>>>> Subject: Re: [Gluster-devel] missing files
> >>>>>
> >>>>>>> On 02/04/2015 01:30 AM, David F. Robinson wrote:
> >>>>>>> Sorry. Thought about this a little more. I should have been clearer.
> >>>>>>> The files were on both bricks of the replica, not just one side. So,
> >>>>>>> both bricks had to have been up... The files/directories just
> >>>>>>> don't show
> >>>>>>> up on the mount.
> >>>>>>> I was reading and saw a related bug
> >>>>>>> (https://bugzilla.redhat.com/show_bug.cgi?id=1159484). I saw it
> >>>>>>> suggested to run:
> >>>>>>> find <mount> -d -exec getfattr -h -n trusted.ec.heal {} \;
> >>>>>>
> >>>>>> This command is specific for a dispersed volume. It won't do anything
> >>>>>> (aside from the error you are seeing) on a replicated volume.
> >>>>>>
> >>>>>> I think you are using a replicated volume, right ?
> >>>>>>
> >>>>>> In this case I'm not sure what can be happening. Is your volume a pure
> >>>>>> replicated one or a distributed-replicated ? on a pure replicated it
> >>>>>> doesn't make sense that some entries do not show in an 'ls' when the
> >>>>>> file is in both replicas (at least without any error message in the
> >>>>>> logs). On a distributed-replicated it could be caused by some problem
> >>>>>> while combining contents of each replica set.
> >>>>>>
> >>>>>> What's the configuration of your volume ?
> >>>>>>
> >>>>>> Xavi
> >>>>>>
> >>>>>>>
> >>>>>>> I get a bunch of errors for operation not supported:
> >>>>>>> [root at gfs02a homegfs]# find wks_backup -d -exec getfattr -h -n
> >>>>>>> trusted.ec.heal {} \;
> >>>>>>> find: warning: the -d option is deprecated; please use -depth
> >>>>>>> instead,
> >>>>>>> because the latter is a POSIX-compliant feature.
> >>>>>>> wks_backup/homer_backup/backup: trusted.ec.heal: Operation not
> >>>>>>> supported
> >>>>>>> wks_backup/homer_backup/logs/2014_05_20.log: trusted.ec.heal:
> >>>>>>> Operation
> >>>>>>> not supported
> >>>>>>> wks_backup/homer_backup/logs/2014_05_21.log: trusted.ec.heal:
> >>>>>>> Operation
> >>>>>>> not supported
> >>>>>>> wks_backup/homer_backup/logs/2014_05_18.log: trusted.ec.heal:
> >>>>>>> Operation
> >>>>>>> not supported
> >>>>>>> wks_backup/homer_backup/logs/2014_05_19.log: trusted.ec.heal:
> >>>>>>> Operation
> >>>>>>> not supported
> >>>>>>> wks_backup/homer_backup/logs/2014_05_22.log: trusted.ec.heal:
> >>>>>>> Operation
> >>>>>>> not supported
> >>>>>>> wks_backup/homer_backup/logs: trusted.ec.heal: Operation not
> >>>>>>> supported
> >>>>>>> wks_backup/homer_backup: trusted.ec.heal: Operation not supported
> >>>>>>> ------ Original Message ------
> >>>>>>> From: "Benjamin Turner" <bennyturns at gmail.com
> >>>>>>> <mailto:bennyturns at gmail.com>>
> >>>>>>> To: "David F. Robinson" <david.robinson at corvidtec.com
> >>>>>>> <mailto:david.robinson at corvidtec.com>>
> >>>>>>> Cc: "Gluster Devel" <gluster-devel at gluster.org
> >>>>>>> <mailto:gluster-devel at gluster.org>>; "gluster-users at gluster.org"
> >>>>>>> <gluster-users at gluster.org <mailto:gluster-users at gluster.org>>
> >>>>>>> Sent: 2/3/2015 7:12:34 PM
> >>>>>>> Subject: Re: [Gluster-devel] missing files
> >>>>>>>> It sounds to me like the files were only copied to one replica,
> >>>>>>>> werent
> >>>>>>>> there for the initial for the initial ls which triggered a self
> >>>>>>>> heal,
> >>>>>>>> and were there for the last ls because they were healed. Is there
> >>>>>>>> any
> >>>>>>>> chance that one of the replicas was down during the rsync? It could
> >>>>>>>> be that you lost a brick during copy or something like that. To
> >>>>>>>> confirm I would look for disconnects in the brick logs as well as
> >>>>>>>> checking glusterfshd.log to verify the missing files were actually
> >>>>>>>> healed.
> >>>>>>>>
> >>>>>>>> -b
> >>>>>>>>
> >>>>>>>> On Tue, Feb 3, 2015 at 5:37 PM, David F. Robinson
> >>>>>>>> <david.robinson at corvidtec.com <mailto:david.robinson at corvidtec.com>>
> >>>>>>>> wrote:
> >>>>>>>>
> >>>>>>>> I rsync'd 20-TB over to my gluster system and noticed that I had
> >>>>>>>> some directories missing even though the rsync completed
> >>>>>>>> normally.
> >>>>>>>> The rsync logs showed that the missing files were transferred.
> >>>>>>>> I went to the bricks and did an 'ls -al
> >>>>>>>> /data/brick*/homegfs/dir/*' the files were on the bricks.
> >>>>>>>> After I
> >>>>>>>> did this 'ls', the files then showed up on the FUSE mounts.
> >>>>>>>> 1) Why are the files hidden on the fuse mount?
> >>>>>>>> 2) Why does the ls make them show up on the FUSE mount?
> >>>>>>>> 3) How can I prevent this from happening again?
> >>>>>>>> Note, I also mounted the gluster volume using NFS and saw the
> >>>>>>>> same
> >>>>>>>> behavior. The files/directories were not shown until I did the
> >>>>>>>> "ls" on the bricks.
> >>>>>>>> David
> >>>>>>>> ===============================
> >>>>>>>> David F. Robinson, Ph.D.
> >>>>>>>> President - Corvid Technologies
> >>>>>>>> 704.799.6944 x101 <tel:704.799.6944%20x101> [office]
> >>>>>>>> 704.252.1310 <tel:704.252.1310> [cell]
> >>>>>>>> 704.799.7974 <tel:704.799.7974> [fax]
> >>>>>>>> David.Robinson at corvidtec.com
> >>>>>>>> <mailto:David.Robinson at corvidtec.com>
> >>>>>>>> http://www.corvidtechnologies.com
> >>>>>>>> <http://www.corvidtechnologies.com/>
> >>>>>>>>
> >>>>>>>> _______________________________________________
> >>>>>>>> Gluster-devel mailing list
> >>>>>>>> Gluster-devel at gluster.org <mailto:Gluster-devel at gluster.org>
> >>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-devel
> >>>>>>>
> >>>>>>>
> >>>>>>> _______________________________________________
> >>>>>>> Gluster-devel mailing list
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> >>>
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