[Gluster-users] major problems with Samba - 0-md-cache: xattr key trusted.afr.GROUP_WORK-client-3 doesn't satisfy caching requirements & Buffer overflow of a buffer whose size limit is 5. About to flush least recently used log message to disk

[lejeczek]

hi everyone,

I do not suppose it is a matter of tweaking Gluster(or Samba) as these
problems I think started appearing after upgrade of Samba
(samba-4.9.1-6.el7.x86_64) and/or Gluster(glusterfs-6.5-1.el7.x86_64)

How it manifests it that Samba operations that a user performs are
incredibly slow. To create a new file(via right-click in Windows) takes
more then dozen of seconds, sometimes fails, the same with renaming
files, etc.

At the same time I samba's part of glusterfs log I see:

...

[2019-10-07 10:42:02.252880] D [logging.c:2006:_gf_msg_internal]
0-logging-infra: Buffer overflow of a buffer whose size limit is 5.
About to flush least recently used log message to disk
The message "T [MSGID: 0] [md-cache.c:678:is_mdc_key_satisfied]
0-md-cache: xattr key glusterfs.parent-entrylk doesn't satisfy caching
requirements" repeated 4 times between [2019-10-07 10:42:02.252788] and
[2019-10-07 10:42:02.252874]
[2019-10-07 10:42:02.252878] T [MSGID: 0]
[md-cache.c:678:is_mdc_key_satisfied] 0-md-cache: xattr key
trusted.glusterfs.dht doesn't satisfy caching requirements
[2019-10-07 10:42:02.252981] D [logging.c:2006:_gf_msg_internal]
0-logging-infra: Buffer overflow of a buffer whose size limit is 5.
About to flush least recently used log message to disk
The message "T [MSGID: 0] [md-cache.c:678:is_mdc_key_satisfied]
0-md-cache: xattr key trusted.glusterfs.dht doesn't satisfy caching
requirements" repeated 4 times between [2019-10-07 10:42:02.252878] and
[2019-10-07 10:42:02.252974]
[2019-10-07 10:42:02.252978] T [MSGID: 0]
[md-cache.c:678:is_mdc_key_satisfied] 0-md-cache: xattr key
trusted.afr.GROUP_WORK-client-3 doesn't satisfy caching requirements
[2019-10-07 10:42:02.253059] D [logging.c:2006:_gf_msg_internal]
0-logging-infra: Buffer overflow of a buffer whose size limit is 5.
About to flush least recently used log message to disk
The message "T [MSGID: 0] [md-cache.c:678:is_mdc_key_satisfied]
0-md-cache: xattr key trusted.afr.GROUP_WORK-client-3 doesn't satisfy
caching requirements" repeated 4 times between [2019-10-07
10:42:02.252978] and [2019-10-07 10:42:02.253052]
[2019-10-07 10:42:02.253056] T [MSGID: 0]
[md-cache.c:678:is_mdc_key_satisfied] 0-md-cache: xattr key link-count
doesn't satisfy caching requirements
[2019-10-07 10:42:02.253140] D [logging.c:2006:_gf_msg_internal]
0-logging-infra: Buffer overflow of a buffer whose size limit is 5.
About to flush least recently used log message to disk
The message "T [MSGID: 0] [md-cache.c:678:is_mdc_key_satisfied]
0-md-cache: xattr key link-count doesn't satisfy caching requirements"
repeated 4 times between [2019-10-07 10:42:02.253056] and [2019-10-07
10:42:02.253131]
[2019-10-07 10:42:02.253138] T [MSGID: 0]
[md-cache.c:792:mdc_inode_xatt_set] 0-md-cache: xatt cache set for
(00000000-0000-0000-0000-000000000001) time:1570444922

I'm going to try to tweak vol's some opts/features but I'd appreciate
suggestions & thoughts.

Many thanks, L.

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