[Bugs] [Bug 1362129] New: rename of a file can cause data loss in an arbiter volume configuration

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1362129

            Bug ID: 1362129
           Summary: rename of a file can cause data loss in an arbiter
                    volume configuration
           Product: Red Hat Gluster Storage
           Version: 3.1
         Component: arbiter
          Keywords: Triaged
          Severity: urgent
          Assignee: ravishankar at redhat.com
          Reporter: ravishankar at redhat.com
        QA Contact: storage-qa-internal at redhat.com
                CC: bugs at gluster.org, nchilaka at redhat.com,
                    rhs-bugs at redhat.com
        Depends On: 1357000



+++ This bug was initially created as a clone of Bug #1357000 +++

Description of problem:
=========================
there is a case where rename of a file leads to data loss.



Steps to Reproduce:
===================
1.create a 1x(2+1) volume with bricks as say db1,db2 and ab1
2.now mount the vol by fuse
3.create a directory say dir1
4. Now bring down the first data brick(db1) 
5. create a file say f1 under dir1 with some contents 
6. note down the getfattr details from both db2 and ab1 
7. now bring down db2 and bring up db1
8. trigger a heal 
9. now rename f1 to f2
10. now bring up db2 and trigger a heal
11. from mount do a cat of f2

We get EIO
[root at dhcp42-93 db1_Down]# cat renamdatafile 
cat: renamdatafile: Input/output error

client logs:
[2016-07-15 12:25:40.299090] W [MSGID: 108008]
[afr-read-txn.c:244:afr_read_txn] 0-arbit-replicate-0: Unreadable subvolume -1
found with event generation 7 for gfid 091d29dd-f4e1-49da-8353-1686e59818de.
(Possible split-brain)
[2016-07-15 12:25:40.301196] E [MSGID: 108008]
[afr-read-txn.c:89:afr_read_txn_refresh_done] 0-arbit-replicate-0: Failing
FGETXATTR on gfid 091d29dd-f4e1-49da-8353-1686e59818de: split-brain observed.
[Input/output error]
[2016-07-15 12:25:40.302017] W [MSGID: 108027]
[afr-common.c:2245:afr_discover_done] 0-arbit-replicate-0: no read subvols for
(null)
[2016-07-15 12:25:40.305693] W [fuse-bridge.c:2228:fuse_readv_cbk]
0-glusterfs-fuse: 796: READ => -1 gfid=091d29dd-f4e1-49da-8353-1686e59818de
fd=0x7fcbf801579c (Input/output error)
[2016-07-15 12:25:40.303768] W [MSGID: 108008]
[afr-read-txn.c:244:afr_read_txn] 0-arbit-replicate-0: Unreadable subvolume -1
found with event generation 7 for gfid 091d29dd-f4e1-49da-8353-1686e59818de.
(Possible split-brain)
[2016-07-15 12:25:40.305666] E [MSGID: 108008]
[afr-read-txn.c:89:afr_read_txn_refresh_done] 0-arbit-replicate-0: Failing READ
on gfid 091d29dd-f4e1-49da-8353-1686e59818de: split-brain observed.
[Input/output error]



db1 getfattr:
root at dhcp43-157 ~]#  getfattr -d -m . -e hex
/bricks/brick2/arbit/db1_Down/renamdatafile 
getfattr: Removing leading '/' from absolute path names
# file: bricks/brick2/arbit/db1_Down/renamdatafile
security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000
trusted.afr.arbit-client-0=0x000000030000000000000000
trusted.afr.arbit-client-1=0x000000010000000000000000
trusted.afr.dirty=0x000000000000000000000000
trusted.bit-rot.version=0x02000000000000005788cb3000085f14
trusted.gfid=0x091d29ddf4e149da83531686e59818de


db2:[root at dhcp43-153 ~]# getfattr -d -m . -e hex
/bricks/brick1/arbit/db1_Down/renamdatafile 
getfattr: Removing leading '/' from absolute path names
# file: bricks/brick1/arbit/db1_Down/renamdatafile
security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000
trusted.gfid=0x091d29ddf4e149da83531686e59818de

ab1:

[root at dhcp43-157 ~]#  getfattr -d -m . -e hex
/bricks/brick0/arbit/db1_Down/renamdatafile 
getfattr: Removing leading '/' from absolute path names
# file: bricks/brick0/arbit/db1_Down/renamdatafile
security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000
trusted.gfid=0x091d29ddf4e149da83531686e59818de


Volume Name: arbit
Type: Replicate
Volume ID: 0069b5a7-bfdf-4f59-86ec-851f500ed902
Status: Started
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: 10.70.43.129:/bricks/brick0/arbit
Brick2: 10.70.43.153:/bricks/brick1/arbit
Brick3: 10.70.43.129:/bricks/brick2/arbit (arbiter)
Options Reconfigured:
nfs.disable: on
performance.readdir-ahead: on
transport.address-family: inet
[root at dhcp43-157 ~]# 





Expected results:


Additional info:

--- Additional comment from Vijay Bellur on 2016-07-27 00:20:31 EDT ---

REVIEW: http://review.gluster.org/15017 (afr: some coverity fixes) posted (#1)
for review on release-3.7 by Ravishankar N (ravishankar at redhat.com)

--- Additional comment from Ravishankar N on 2016-07-27 00:22:42 EDT ---

Ignore comment #1, that patch is for a different bug.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1357000
[Bug 1357000] rename of a file can cause data loss in an arbiter volume
configuration
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