[Bugs] [Bug 1266875] New: geo-replication: Fix races while handling rebalanced data in Tiering volume

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1266875

            Bug ID: 1266875
           Summary: geo-replication: Fix races while handling rebalanced
                    data in Tiering volume
           Product: GlusterFS
           Version: mainline
         Component: geo-replication
          Assignee: bugs at gluster.org
          Reporter: sarumuga at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:

Race conditions can occur while processing changelogs(by geo-replication) in
Tiering based volume, where rebalanace can cause frequent movement of files
between hot and cold tiers.

Also, rebalance operations are internal operations which needs to be avoided.
(Deletion of the file and Creation of the file while carrying out rebalance).

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


How reproducible:

Following is one such example:

==================================
Brick1             Brick2
==================================
Create file        (file moved due to rebalance).
            Data file
            Delete file
==================================

If Brick2 changelogs processed first followed by Brick1, file may be created.
But, we expect the file to be deleted (as per the last operation)

Steps to Reproduce:
1.
2.
3.

Actual results:
Files are not synced properly.

Expected results:
Files are synced as expected.

Additional info:

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