[Gluster-users] interpreting heal info and reported entries

Thu Jan 30 06:11:00 UTC 2020

On 29/01/20 9:56 pm, Cox, Jason wrote:
>
> I have glusterfs (v6.6) deployed with 3-way replication used by ovirt 
> (v4.3).
>
> I recently updated 1 of the nodes (now at gluster v6.7) and rebooted. 
> When it came back online, glusterfs reported there were entries to be 
> healed under the 2 nodes that had stayed online.
>
> After 2+ days, the 2 nodes still show entries that need healing, so 
> I’m trying to determine what the issue is.
>
> The files shown in the heal info output are small so healing should 
> not take long. Also, ‘Gluster v heal <vol>’ and ‘gluster v heal <vol> 
> full’ both return successful, but the entries persist.
>
> So first off, I’m a little confused by what gluster volume heal <vol> 
> info is reporting.
>
> The following is what I see from heal info:
>
> # gluster v heal engine info
>
> Brick repo0:/gluster_bricks/engine/engine
>
> /372501f5-062c-4790-afdb-dd7e761828ac/images/968daf61-6858-454a-9ed4-3d3db2ae1805/4317dd0d-fd35-4176-9353-7ff69e3a8dc3.meta 
>
>
> /372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta 
>
>
> Status: Connected
>
> Number of entries: 2
>
> Brick repo1:/gluster_bricks/engine/engine
>
> /372501f5-062c-4790-afdb-dd7e761828ac/images/968daf61-6858-454a-9ed4-3d3db2ae1805/4317dd0d-fd35-4176-9353-7ff69e3a8dc3.meta 
>
>
> /372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta 
>
>
> Status: Connected
>
> Number of entries: 2
>
> Brick repo2:/gluster_bricks/engine/engine
>
> Status: Connected
>
> Number of entries: 0
>
> Repo0 and repo1 were not rebooted, but repo2 was.
>
> Since repo2 went offline I would expect when it came back online it 
> would have entries that need healing, but based on the heal info 
> output that’s not what it looks like, so I’m thinking maybe heal info 
> isn’t reporting what I think it is reporting.
>
> *When gluster volume heal <vol> info reports entries as above, what is 
> it saying?
>
In heal info output, it is usually the nodes that were up that display 
the list of files that need heal. So the way to interpret it is while 
repo2 was down, repo0 and repo1 witnessed some modification to the files 
and therefore capture them as needing heal, whose list is what the CLI 
displays

> From the above output, I was reading it as repo0 has 2 entries that 
> need to be healed from the other bricks and repo1 has 2 entries that 
> need healing from the other bricks. However, that doesn’t make sense 
> since repo2 was the one that was rebooted and a ‘stat’ on the files in 
> the bricks show repo2 is the older version (checksums also show repo0 
> and repo1 match).  Trying to access the file through the FUSE mount on 
> any node gives input/output errors.
>
> Getfattr output:
>
> repo0 glusterfs]# getfattr -d -m. -e hex 
> /gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> getfattr: Removing leading '/' from absolute path names
>
> # file: 
> gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> security.selinux=0x73797374656d5f753a6f626a6563745f723a676c7573746572645f627269636b5f743a733000
>
> trusted.afr.dirty=0x000000000000000000000000
>
> trusted.afr.engine-client-2=0x000000020000000200000000
>
> trusted.bit-rot.signature=0x0102000000000000009338ff61a57fcb452b92ae816b8e5ff672be6d340e7da0a0dcfa34e26b26933b
>
> trusted.bit-rot.version=0x02000000000000005e09d54f000ef84f
>
> trusted.gfid=0xb85edc187d594872a594c25419154d05
>
> trusted.gfid2path.ff2d749198341aff=0x32393564303861372d386437352d343638392d393239332d3339336434346362656233342f63656234323734322d656161612d343836372d616135342d6461353235363239616165342e6d657461
>
> trusted.glusterfs.mdata=0x010000000000000000000000005e2f88ce000000002d1fe613000000005e2f88ce000000002d10ae53000000005e2f88ce000000002d067b3b
>
> trusted.glusterfs.shard.block-size=0x0000000004000000
>
> trusted.glusterfs.shard.file-size=0x00000000000001ad000000000000000000000000000000010000000000000000
>
> trusted.pgfid.295d08a7-8d75-4689-9293-393d44cbeb34=0x00000001
>
> repo1 glusterfs]# getfattr -d -m. -e hex 
> /gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> getfattr: Removing leading '/' from absolute path names
>
> # file: 
> gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> security.selinux=0x73797374656d5f753a6f626a6563745f723a676c7573746572645f627269636b5f743a733000
>
> trusted.afr.dirty=0x000000000000000000000000
>
> trusted.afr.engine-client-2=0x000000020000000200000000
>
> trusted.bit-rot.signature=0x0102000000000000009338ff61a57fcb452b92ae816b8e5ff672be6d340e7da0a0dcfa34e26b26933b
>
> trusted.bit-rot.version=0x02000000000000005e09db580000709b
>
> trusted.gfid=0xb85edc187d594872a594c25419154d05
>
> trusted.gfid2path.ff2d749198341aff=0x32393564303861372d386437352d343638392d393239332d3339336434346362656233342f63656234323734322d656161612d343836372d616135342d6461353235363239616165342e6d657461
>
> trusted.glusterfs.mdata=0x010000000000000000000000005e2f88ce000000002d1fe613000000005e2f88ce000000002d10ae53000000005e2f88ce000000002d067b3b
>
> trusted.glusterfs.shard.block-size=0x0000000004000000
>
> trusted.glusterfs.shard.file-size=0x00000000000001ad000000000000000000000000000000010000000000000000
>
> trusted.pgfid.295d08a7-8d75-4689-9293-393d44cbeb34=0x00000001
>
> repo2 glusterfs]# getfattr -d -m. -e hex 
> /gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> getfattr: Removing leading '/' from absolute path names
>
> # file: 
> gluster_bricks/engine/engine/372501f5-062c-4790-afdb-dd7e761828ac/images/4e3e8ca5-0edf-42ae-ac7b-e9a51ad85922/ceb42742-eaaa-4867-aa54-da525629aae4.meta
>
> security.selinux=0x73797374656d5f753a6f626a6563745f723a676c7573746572645f627269636b5f743a733000
>
> trusted.afr.dirty=0x000000000000000000000000
>
> trusted.bit-rot.signature=0x010200000000000000413e794bfbaf54b98bc00df95ce540fb6affe56ab5f5ddbb1fdb9eec096e0232
>
> trusted.bit-rot.version=0x02000000000000005e09d553000151af
>
> trusted.gfid=0xd36b1a8f63bc4a4bbcd0433882866733
>
> trusted.gfid2path.ff2d749198341aff=0x32393564303861372d386437352d343638392d393239332d3339336434346362656233342f63656234323734322d656161612d343836372d616135342d6461353235363239616165342e6d657461
>
> trusted.glusterfs.mdata=0x010000000000000000000000005e1df4a80000000020b618bf000000005e1df4a80000000020a1633c000000005e1df4a80000000020950ed4
>
> trusted.glusterfs.shard.block-size=0x0000000004000000
>
> trusted.glusterfs.shard.file-size=0x00000000000001ad000000000000000000000000000000010000000000000000
>
> trusted.pgfid.295d08a7-8d75-4689-9293-393d44cbeb34=0x00000001
>
> searching the gluster logs for 
> ceb42742-eaaa-4867-aa54-da525629aae4.meta I see:
>
> repo0:
>
> ./rhev-data-center-mnt-glusterSD-repo0:_engine.log:The message "E 
> [MSGID: 108008] 
> [afr-self-heal-common.c:384:afr_gfid_split_brain_source] 
> 0-engine-replicate-0: Gfid mismatch detected for 
> <gfid:295d08a7-8d75-4689-9293-393d44cbeb34>/ceb42742-eaaa-4867-aa54-da525629aae4.meta>, 
> d36b1a8f-63bc-4a4b-bcd0-433882866733 on engine-client-2 and 
> b85edc18-7d59-4872-a594-c25419154d05 on engine-client-1." repeated 5 
> times between [2020-01-28 23:01:22.912513] and [2020-01-28 
> 23:02:10.907716]
>
> ./rhev-data-center-mnt-glusterSD-repo0:_engine.log:[2020-01-28 
> 23:24:12.808924] E [MSGID: 108008] 
> [afr-self-heal-common.c:384:afr_gfid_split_brain_source] 
> 0-engine-replicate-0: Gfid mismatch detected for 
> <gfid:295d08a7-8d75-4689-9293-393d44cbeb34>/ceb42742-eaaa-4867-aa54-da525629aae4.meta>, 
> d36b1a8f-63bc-4a4b-bcd0-433882866733 on engine-client-2 and 
> b85edc18-7d59-4872-a594-c25419154d05 on engine-client-1.
>
> repo1:
>
> nothing
>
> repo2:
>
> ./rhev-data-center-mnt-glusterSD-repo0:_engine.log:The message "E 
> [MSGID: 108008] 
> [afr-self-heal-common.c:384:afr_gfid_split_brain_source] 
> 0-engine-replicate-0: Gfid mismatch detected for 
> <gfid:295d08a7-8d75-4689-9293-393d44cbeb34>/ceb42742-eaaa-4867-aa54-da525629aae4.meta>, 
> d36b1a8f-63bc-4a4b-bcd0-433882866733 on engine-client-2 and 
> b85edc18-7d59-4872-a594-c25419154d05 on engine-client-1." repeated 23 
> times between [2020-01-29 15:42:46.201849] and [2020-01-29 
> 15:44:36.873793]
>
> ./rhev-data-center-mnt-glusterSD-repo0:_engine.log:[2020-01-29 
> 15:44:47.016466] E [MSGID: 108008] 
> [afr-self-heal-common.c:384:afr_gfid_split_brain_source] 
> 0-engine-replicate-0: Gfid mismatch detected for 
> <gfid:295d08a7-8d75-4689-9293-393d44cbeb34>/ceb42742-eaaa-4867-aa54-da525629aae4.meta>, 
> d36b1a8f-63bc-4a4b-bcd0-433882866733 on engine-client-2 and 
> b85edc18-7d59-4872-a594-c25419154d05 on engine-client-1.
>
> So it looks like a split brain issue according to the log message.
>
> However,
>
>     *Why doesn’t heal info show a split brain condition?
>
>     *Why does the logs for repo1 not have anything concerning 
> ceb42742-eaaa-4867-aa54-da525629aae4.meta?
>
>     *If repo0 and repo1 match, why is there a split brain issue?
>
I think for some reason setting of AFR xattrs on the parent dir did not 
happen, which is why the files are stuck in split-brain (instead of 
getting recreated on repo2 using the files from repo0 or 1). You can 
resolve it using the split-brain CLI, eg: `gluster volume heal $volname 
split-brain  source-brick repo0:/gluster_bricks/engine/engine 
/372501f5-062c-4790-afdb-dd7e761828ac/images/968daf61-6858-454a-9ed4-3d3db2ae1805/4317dd0d-fd35-4176-9353-7ff69e3a8dc3.meta` 


Thanks,
Ravi
>
> ‘Gluster peer status’ on each node shows connected to each of the 
> other 2 nodes.
>
> ‘Gluster volume heal engine info’ on each node shows each brick is 
> connected.
>
> ‘Gluster status engine’ on each node shows all 3 bricks as online, all 
> 3 self-heal daemons as online, all 3 bitrot daemons online, and all 3 
> scrubber daemons online.
>
> Thanks,
>
> Jason
>
>
>
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