[Bugs] [Bug 1577862] [geo-rep]: Upgrade fails, session in FAULTY state

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1577862

Worker Ant <bugzilla-bot at gluster.org> changed:

           What    |Removed                     |Added
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             Status|POST                        |MODIFIED



--- Comment #4 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/20018 committed in release-3.12 by "jiffin
tony Thottan" <jthottan at redhat.com> with a commit message- geo-rep: Fix upgrade
issue

Cause and Analysis:
The last synced changelog for entry operations is
marked in current version to avoid re-processing
of already processed entry operations in a batch
during crash/restart of geo-rep. This was not
present in previous versoins.

The marker is maintained in the dictionary with the
key 'last_synced_entry' and dictionary is persisted
into status file. So upgrading to current version in
which the marker is present was failing with KeyError.

Solution:
Load the dictionary with default keys first which
contains all the keys including latest ones and then
load the values from status file instead of doing
otherwise.

Backport of
> patch: https://review.gluster.org/19969/
> Change-Id: Ic654e6f9a3c97f616761f1362f890352a2186fb4
> Signed-off-by: Kotresh HR <khiremat at redhat.com>
(cherry picked from commit 23c1385b5f6f6103e820d15ecfe1df31940fdb45)

fixes: bz#1577862
Change-Id: Ic654e6f9a3c97f616761f1362f890352a2186fb4
Signed-off-by: Kotresh HR <khiremat at redhat.com>

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