[Gluster-users] Self healing does not see files to heal

Дмитрий Глушенок glush at jet.msk.su
Tue Aug 16 17:14:34 UTC 2016


While testing healing after bitrot error it was found that self healing cannot heal files which were manually deleted from brick. Gluster 3.8.1:

- Create volume, mount it locally and copy test file to it
[root at srv01 ~]# gluster volume create test01 replica 2  srv01:/R1/test01 srv02:/R1/test01 
volume create: test01: success: please start the volume to access data
[root at srv01 ~]# gluster volume start test01
volume start: test01: success
[root at srv01 ~]# mount -t glusterfs srv01:/test01 /mnt
[root at srv01 ~]# cp /etc/passwd /mnt
[root at srv01 ~]# ls -l /mnt
итого 2
-rw-r--r--. 1 root root 1505 авг 16 19:59 passwd

- Then remove test file from first brick like we have to do in case of bitrot error in the file
[root at srv01 ~]# rm /R1/test01/passwd 
[root at srv01 ~]# ls -l /mnt
итого 0
[root at srv01 ~]# 

- Issue full self heal
[root at srv01 ~]# gluster volume heal test01 full
Launching heal operation to perform full self heal on volume test01 has been successful 
Use heal info commands to check status
[root at srv01 ~]# tail -2 /var/log/glusterfs/glustershd.log
[2016-08-16 16:59:56.483767] I [MSGID: 108026] [afr-self-heald.c:611:afr_shd_full_healer] 0-test01-replicate-0: starting full sweep on subvol test01-client-0
[2016-08-16 16:59:56.486560] I [MSGID: 108026] [afr-self-heald.c:621:afr_shd_full_healer] 0-test01-replicate-0: finished full sweep on subvol test01-client-0

- Now we still see no files in mount point (it becomes empty right after removing file from the brick)
[root at srv01 ~]# ls -l /mnt
итого 0
[root at srv01 ~]# 

- Then try to access file by using full name (lookup-optimize and readdir-optimize are turned off by default). Now glusterfs shows the file!
[root at srv01 ~]# ls -l /mnt/passwd
-rw-r--r--. 1 root root 1505 авг 16 19:59 /mnt/passwd

- And it reappeared in the brick
[root at srv01 ~]# ls -l /R1/test01/
итого 4
-rw-r--r--. 2 root root 1505 авг 16 19:59 passwd
[root at srv01 ~]#

Is it a bug or we can tell self heal to scan all files on all bricks in the volume?

Dmitry Glushenok
Jet Infosystems

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