[Gluster-users] split-brain on glusterfs running with quorum on server and client

Sat Sep 6 12:29:12 UTC 2014

What is the glusterfs version where you ran into this issue?

Pranith
On 09/05/2014 11:52 PM, Ramesh Natarajan wrote:
> I have a replicate glusterfs setup on 3 Bricks ( replicate = 3 ). I 
> have client and server quorum turned on.  I rebooted one of the 3 
> bricks. When it came back up, the client started throwing error 
> messages that one of the files went into split brain.
>
> When i check the file sizes and sha1sum on the bricks, 2 of the 3 
> bricks have the same value. So by quorum logic the first brick should 
> have healed with this information. But i don't see that happening. Can 
> someone please tell me if this is expected behavior?
>
>
> Can someone please tell me if i have things misconfigured...
>
> thanks
> Ramesh
>
> My config is as below.
>
> [root at ip-172-31-12-218 ~]# gluster volume info
> Volume Name: PL1
> Type: Replicate
> Volume ID: a7aabae0-c6bc-40a9-8b26-0498d488ee39
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: 172.31.38.189:/data/vol1/gluster-data
> Brick2: 172.31.16.220:/data/vol1/gluster-data
> Brick3: 172.31.12.218:/data/vol1/gluster-data
> Options Reconfigured:
> performance.cache-size: 2147483648
> nfs.addr-namelookup: off
> network.ping-timeout: 12
> cluster.server-quorum-type: server
> nfs.enable-ino32: on
> cluster.quorum-type: auto
> cluster.server-quorum-ratio: 51%
> Volume Name: PL2
> Type: Replicate
> Volume ID: fadb3671-7a92-40b7-bccd-fbacf672f6dc
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: 172.31.38.189:/data/vol2/gluster-data
> Brick2: 172.31.16.220:/data/vol2/gluster-data
> Brick3: 172.31.12.218:/data/vol2/gluster-data
> Options Reconfigured:
> performance.cache-size: 2147483648
> nfs.addr-namelookup: off
> network.ping-timeout: 12
> cluster.server-quorum-type: server
> nfs.enable-ino32: on
> cluster.quorum-type: auto
> cluster.server-quorum-ratio: 51%
> [root at ip-172-31-12-218 ~]#
>
>
> I have 2 clients each mounting one of the volumes. At no time the same 
> volume is mounted by more than 1 client.
>
> mount -t glusterfs -o 
> defaults,enable-ino32,direct-io-mode=disable,log-level=WARNING,log-file=/var/log/gluster.log,backupvolfile-server=172.31.38.189,backupvolfile-server=172.31.12.218,background-qlen=256 
> 172.31.16.220:/PL2  /mnt/vm
>
>
> I restarted the Brick 1 172.31.38.189 and when it came up, one of the 
> file on PL2 volume went into split mode..
>
>
> [2014-09-05 17:59:42.997308] W [afr-open.c:209:afr_open] 
> 0-PL2-replicate-0: failed to open as split brain seen, returning EIO
> [2014-09-05 17:59:42.997350] W [fuse-bridge.c:2209:fuse_writev_cbk] 
> 0-glusterfs-fuse: 3359683: WRITE => -1 (Input/output error)
> [2014-09-05 17:59:42.997476] W [fuse-bridge.c:690:fuse_truncate_cbk] 
> 0-glusterfs-fuse: 3359684: FTRUNCATE() ERR => -1 (Input/
> output error)[2014-09-05 17:59:42.997647] W 
> [fuse-bridge.c:2209:fuse_writev_cbk] 0-glusterfs-fuse: 3359686: WRITE 
> => -1 (Input/output erro
> r)[2014-09-05 17:59:42.997783] W [fuse-bridge.c:1214:fuse_err_cbk] 
> 0-glusterfs-fuse: 3359687: FLUSH() ERR => -1 (Input/output e
> rror)[2014-09-05 17:59:44.009187] E 
> [afr-self-heal-common.c:233:afr_sh_print_split_brain_log] 
> 0-PL2-replicate-0: Unable to self-he
> al contents of '/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00' 
> (possible split-brain). Please delete the file from all but the 
> preferred subvolume.- Pending matrix:  [ [ 0 1 1 ] [ 3398 0 0 ] [ 3398 
> 0 0 ] ]
> [2014-09-05 17:59:44.011116] E 
> [afr-self-heal-common.c:2868:afr_log_self_heal_completion_status] 
> 0-PL2-replicate-0:  backgroung data self heal  failed, on 
> /apache_cp_mm1/logs/access_log.2014-09-05-17_00_00
> [2014-09-05 17:59:44.011480] W [afr-open.c:209:afr_open] 
> 0-PL2-replicate-0: failed to open as split brain seen, returning EIO
>
> Starting time of crawl: Fri Sep  5 17:55:32 2014
>
> Ending time of crawl: Fri Sep  5 17:55:33 2014
>
> Type of crawl: INDEX
> No. of entries healed: 4
> No. of entries in split-brain: 1
> No. of heal failed entries: 0
> [root at ip-172-31-16-220 ~]# gluster volume heal PL2 info
> Brick ip-172-31-38-189:/data/vol2/gluster-data/
> /apache_cp_mm1/logs/mm1.access_log.2014-09-05-17_00_00
> Number of entries: 1
>
> Brick ip-172-31-16-220:/data/vol2/gluster-data/
> /apache_cp_mm1/logs/mm1.access_log.2014-09-05-17_00_00
> Number of entries: 1
>
> Brick ip-172-31-12-218:/data/vol2/gluster-data/
> /apache_cp_mm1/logs/mm1.access_log.2014-09-05-17_00_00
> Number of entries: 1
>
>
> BRICK1
> ========
>
> [root at ip-172-31-38-189 ~]# sha1sum access_log.2014-09-05-17_00_00
> aa72d0f3949700f67b61d3c58fdbc75b772d607b  access_log.2014-09-05-17_00_00
>
> [root at ip-172-31-38-189 ~]# ls -al
> total 12760
> dr-xr-x---  3 root     root         4096 Sep  5 17:42 .
> dr-xr-xr-x 24 root     root         4096 Sep  5 17:34 ..
> -rw-r-----  1 root     root     13019808 Sep  5 17:42 
> access_log.2014-09-05-17_00_00
>
> [root at ip-172-31-38-189 ~]# getfattr -d -m . -e hex 
>  /data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00 
>
> getfattr: Removing leading '/' from absolute path names
> # file: 
> data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00
> trusted.afr.PL2-client-0=0x000000000000000000000000
> trusted.afr.PL2-client-1=0x000000010000000000000000
> trusted.afr.PL2-client-2=0x000000010000000000000000
> trusted.gfid=0xea950263977e46bf89a0ef631ca139c2
>
>
> BRICK 2
> =======
>
> [root at ip-172-31-16-220 ~]# sha1sum access_log.2014-09-05-17_00_00
> 0f7b72f77a792b5c2b68456c906cf7b93287f0d6  access_log.2014-09-05-17_00_00
>
> [root at ip-172-31-16-220 ~]# getfattr -d -m . -e hex 
>  /data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00 
>
> getfattr: Removing leading '/' from absolute path names
> # file: 
> data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00
> trusted.afr.PL2-client-0=0x00000d460000000000000000
> trusted.afr.PL2-client-1=0x000000000000000000000000
> trusted.afr.PL2-client-2=0x000000000000000000000000
> trusted.gfid=0xea950263977e46bf89a0ef631ca139c2
>
> BRICK 3
> =========
>
> [root at ip-172-31-12-218 ~]# sha1sum access_log.2014-09-05-17_00_00
> 0f7b72f77a792b5c2b68456c906cf7b93287f0d6  access_log.2014-09-05-17_00_00
>
> [root at ip-172-31-12-218 ~]# getfattr -d -m . -e hex 
>  /data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00 
>
> getfattr: Removing leading '/' from absolute path names
> # file: 
> data/vol2/gluster-data/apache_cp_mm1/logs/access_log.2014-09-05-17_00_00
> trusted.afr.PL2-client-0=0x00000d460000000000000000
> trusted.afr.PL2-client-1=0x000000000000000000000000
> trusted.afr.PL2-client-2=0x000000000000000000000000
> trusted.gfid=0xea950263977e46bf89a0ef631ca139c2
>
>
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