[Bugs] [Bug 1575490] [geo-rep]: Upgrade fails, session in FAULTY state

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1575490

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

           What    |Removed                     |Added
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             Status|POST                        |MODIFIED



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/19969 committed in master by "Aravinda VK"
<avishwan 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.

fixes: bz#1575490
Change-Id: Ic654e6f9a3c97f616761f1362f890352a2186fb4
Signed-off-by: Kotresh HR <khiremat at redhat.com>

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