[Bugs] [Bug 1510342] New: Not all files synced using geo-replication

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1510342

            Bug ID: 1510342
           Summary: Not all files synced using geo-replication
           Product: GlusterFS
           Version: 3.12
         Component: geo-replication
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: dimitri.ars at gmail.com
                CC: bugs at gluster.org



Description of problem:
When using Sonatype Nexus3 as a docker repository on glusterfs and
geo-replicating this volume, at least the .bytes files which contain the docker
layer data do not get synced. The files are created on the geo-replicated site,
but remain 0 bytes. Other files, like the .properties files are synced
properly.
The moment you add a character to the .bytes file manually (echo >>), the
.bytes file data does get synced...it seems like gluster doesn't detect writing
data to the file in some cases, at least the way Nexus3 does it to those .bytes
files. We suspect that there will more applications / files affected by this,
resulting in a corrupt / incomplete data on the geo-replicated site.

Version-Release number of selected component (if applicable):
3.12.1-2

How reproducible:
100%

Steps to Reproduce:
1. Run Sonatype Nexus3 with a hosted docker repository and it's data
(/nexus-data) on a glusterfs volume which is geo-replicated.
2. docker push an arbitrary image into this nexus docker repo
3. ls -laRf blobs/default/content | grep .bytes
   on both main site and geo-replicated site and see that the ones on the main
site are non-0 bytes and on the geo-replicated site they're 0 bytes

Actual results:
main:
-rw-r--r--. 2 200 200  529 Nov  3 15:27
e39d9b3a-53e0-44bc-b4a2-31d145aeec81.bytes
-rw-r--r--. 1 200 200 1991435 Nov  3 19:00
613953bb-b542-4db7-ba18-01a331361994.bytes


geo-replicated:
-rw-r--r--. 0 root root    0 Nov  3 19:01
613953bb-b542-4db7-ba18-01a331361994.bytes
-rw-r--r--. 0 root root    0 Nov  3 15:28
e39d9b3a-53e0-44bc-b4a2-31d145aeec81.bytes

Expected results:
main:
-rw-r--r--. 2 200 200  529 Nov  3 15:27
e39d9b3a-53e0-44bc-b4a2-31d145aeec81.bytes
-rw-r--r--. 1 200 200 1991435 Nov  3 19:00
613953bb-b542-4db7-ba18-01a331361994.bytes


geo-replicated:
-rw-r--r--. 2 200 200  529 Nov  3 15:27
e39d9b3a-53e0-44bc-b4a2-31d145aeec81.bytes
-rw-r--r--. 1 200 200 1991435 Nov  3 19:00
613953bb-b542-4db7-ba18-01a331361994.bytes

Additional info:
Tried both rsync and use-tarssh, same issue.
Date/time is the same on main and geo-replicated site servers
An initial sync does correctly sync the .bytes files.
Maybe related to https://bugzilla.redhat.com/show_bug.cgi?id=1437244

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