Geo-replication does not send filesystem changes

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Hi everyone,

I have a problem with native geo-replication setup. It successfully starts, makes initial sync but does not send any filesystem data changes afterward.
I'm using CentOS 7.6.1810 with official glusterfs-6.3-1.el7 build on top of ZFS on Linux.
It is a single Master node with single brick and the same Slave node.

# "gluster vol geo-rep status" command gives the following output
 MASTER NODE = gfs-alfa1
 MASTER VOL = cicd
 MASTER BRICK = /zdata/cicd/brick
 SLAVE USER = root
 SLAVE = gfs-alfa2::cicd
 SLAVE NODE = gfs-alfa2
 STATUS = Active
 CRAWL STATUS = Changelog Crawl
 LAST_SYNCED = 2019-07-05 12:08:17
 ENTRY = 0
 DATA = 0
 META = 0
 FAILURES = 0
 CHECKPOINT TIME = 2019-07-05 12:13:46
 CHECKPOINT COMPLETED = No

I enabled DEBUG level log for gsyncd.log but did not get any error messages from it. Full log is available here: https://pastebin.com/pXL4dBhZ
On both brick I disabled ctime feature because it is incompatible with old versions of gfs clients, enabling this feature does not help too.

# gluster volume info
 Volume Name: cicd
 Type: Distribute
 Volume ID: 8f959a35-c7ab-4484-a1e8-9fa8e3a713b4
 Status: Started
 Snapshot Count: 0
 Number of Bricks: 1
 Transport-type: tcp
 Bricks:
 Brick1: gfs-alfa1:/zdata/cicd/brick
 Options Reconfigured:
 nfs.disable: on
 transport.address-family: inet
 features.ctime: off
 geo-replication.indexing: on
 geo-replication.ignore-pid-check: on
 changelog.changelog: on

# gluster volume get cicd rollover-time
Option                                  Value
------                                  -----
changelog.rollover-time                 15

# gluster volume get cicd fsync-interval
Option                                  Value
------                                  -----
changelog.fsync-interval                5

Could someone help me with debug of this geo-rep setup?
Thank you!

BR, Alexey


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