[Bugs] [Bug 1379935] SMB[md-cache Private Build]: Error messages in brick logs related to upcall_cache_invalidate gf_uuid_is_null

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1379935

Prasad Desala <tdesala at redhat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tdesala at redhat.com



--- Comment #1 from Prasad Desala <tdesala at redhat.com> ---
Same issue is seen with private glusterfs build:
3.8.4-2.26.git0a405a4.el7rhgs.x86_64

This issue is specific to md-cache upcall, with the setup in same state
disabled below md-cache options (see gluster v info ouput for more info) and
ERROR messages were not seen in brick logs. Enabling the md-cache started
spamming the brick logs with the error messages.

Steps that were performed:

1. Create a distributed replica volume and started it.
2. Enabled md-cache supported options to the volume. Please see below gluster v
info for the more details on the md-cache enabled options.
3. Mounted volume on multiple clients. Simultaneosuly, from one client touch
10000 files and from another client create 10000 hardlinks for the same file.
4. Add few bricks and start rebalance.
5. Once the rebalance is completed, remove all the files on the mount point
using "rm -rf".
6.  Check for brick logs, for the invalid argument messages.

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