[Gluster-users] Possible reason for "meta-data data entry missing-entry gfid self-heal failed"?

[Marc Seeger]

Hey, in our testing we seem to sometimes run into a problem with gluster fs breaking.
The most recent occurrence was two processes on two machines trying to stat the same lock file:
2013-03-06T16:41:27+00:00 daemon.notice : creating directory: dir=/home/vcltest464/.drush, user=10036, group=10036, mode=0700
2013-03-06T16:41:27+00:00 daemon.notice : PHP Warning:  stat(): stat failed for /home/vcltest464/.drush/vcltest464.aliases.drushrc.php.lock in [...].php on line 695
2013-03-06T16:41:27+00:00 daemon.notice : PHP Warning:  stat(): stat failed for /home/vcltest464/.drush/vcltest464.aliases.drushrc.php.lock in [...].php on line 695
2013-03-06T16:41:27+00:00 daemon.notice : PHP Warning:  stat(): stat failed for /home/vcltest464/.drush/vcltest464.aliases.drushrc.php.lock in [...].php on line 695
(a few thousand times. it was a bug in the locking code when the stat failed)

It ends up as something like this in the gluster log files:

[2013-03-06 16:34:36.875559] W [client3_1-fops.c:2457:client3_1_link_cbk] 0-remote8: remote operation failed: File exists (00000000-0000-0000-0000-000000000000 -> /home/vcltest418/prod)
[2013-03-06 16:34:36.875559] W [client3_1-fops.c:2457:client3_1_link_cbk] 0-remote7: remote operation failed: File exists (00000000-0000-0000-0000-000000000000 -> /home/vcltest418/prod)
[2013-03-06 16:36:24.809098] W [client3_1-fops.c:327:client3_1_mkdir_cbk] 0-remote8: remote operation failed: File exists. Path: /vcltest473/php_sessions (00000000-0000-0000-0000-000000000000)
[2013-03-06 16:36:24.809098] W [client3_1-fops.c:327:client3_1_mkdir_cbk] 0-remote7: remote operation failed: File exists. Path: /vcltest473/php_sessions (00000000-0000-0000-0000-000000000000)
[2013-03-06 16:36:24.809098] W [fuse-bridge.c:292:fuse_entry_cbk] 0-glusterfs-fuse: 9061: MKDIR() /vcltest473/php_sessions => -1 (File exists)
[2013-03-06 16:36:26.179144] I [afr-self-heal-common.c:1189:afr_sh_missing_entry_call_impunge_recreate] 0-replicate0: no missing files - /home/vcltest473/.drush/vcltest473.aliases.drushrc.php.lock. proceeding to metadata check
[2013-03-06 16:36:34.899435] I [afr-self-heal-entry.c:2333:afr_sh_entry_fix] 0-replicate0: /vcltest473/livedev: Performing conservative merge
[2013-03-06 16:41:02.118580] W [client3_1-fops.c:327:client3_1_mkdir_cbk] 0-remote8: remote operation failed: File exists. Path: /vcltest723/files-private (00000000-0000-0000-0000-000000000000)
[2013-03-06 16:41:02.118580] W [client3_1-fops.c:327:client3_1_mkdir_cbk] 0-remote7: remote operation failed: File exists. Path: /vcltest723/files-private (00000000-0000-0000-0000-000000000000)
[2013-03-06 16:41:02.118580] W [fuse-bridge.c:292:fuse_entry_cbk] 0-glusterfs-fuse: 12435: MKDIR() /vcltest723/files-private => -1 (File exists)
[2013-03-06 16:41:27.179425] I [afr-self-heal-common.c:1941:afr_sh_post_nb_entrylk_conflicting_sh_cbk] 0-replicate0: Non blocking entrylks failed.
[2013-03-06 16:41:27.179425] E [afr-self-heal-common.c:2160:afr_self_heal_completion_cbk] 0-replicate0: background  meta-data data entry missing-entry gfid self-heal failed on /home/vcltest464/.drush/vcltest464.aliases.drushrc.php.lock
[2013-03-06 16:41:27.179425] W [inode.c:914:inode_lookup] (-->/usr/lib/libglusterfs.so.0(default_lookup_cbk+0xc1) [0x7f93c6ac7d01] (-->/usr/lib/glusterfs/3.3.1/xlator/mount/fuse.so(+0xf198) [0x7f93c45ef198] (-->/usr/lib/glusterfs/3.3.1/xlator/mount/fuse.so(+0xeffb) [0x7f93c45eeffb]))) 0-fuse: inode not found


After this, the mountpoint was not responding to file_exists() anymore which usually means the client died. Any idea what could have caused such behaviour?


Cheers,
Marc
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