[jira] [Created] (SLING-4711) Syncing via a coordinate agent - conflicts resolution

["Maciej Dybek (JIRA)" <ji...@apache.org>]

Maciej Dybek created SLING-4711:
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             Summary: Syncing via a coordinate agent - conflicts resolution
                 Key: SLING-4711
                 URL: https://issues.apache.org/jira/browse/SLING-4711
             Project: Sling
          Issue Type: Bug
          Components: Distribution
    Affects Versions: Content Distribution Core 0.1.1
            Reporter: Maciej Dybek


Basically this issue should be treated as a question/bug.

I'm trying to synchronize two Sling instances A and B via a (third) coordinating instance C. This scenario is described [here|https://github.com/apache/sling/tree/trunk/contrib/extensions/distribution#sync-distribution].

I am using SyncDistributionAgentFactory on the syncing instance and QueueDistributionAgentFactory on synced instances.
On the syncing instance I'm using ScheduledDistributionTrigger which runs every 60 seconds.

The scenario I wanted to test is conflict resolution. I made changes to the same resource on both "publish" instances A and B. On A instance I changed property X to value "A" and on B instance I changed the same property  to value "B" 

Currently the algorithm is as follows:
1. The syncing agent retrieves distribution packagages from both synced instances A and B.
2. The syncing agent have now two packagages which should be send to importers on synced instances.
3. The agent checks the first package and it sees that the package is from instance A thus it is not going to send the package to A instance. The agent sends the package to B instance. On B instance property X is of value "A".
4. The agent checks the second package and it sees that the package is from instance B thus it sends the package only to A instance. On A instance property X is of value B.

*Actual results:*
Instances A and B are unsynchronized because the same property is of different values on both of them.

*Expected results:*
Instances A and B should have the same content.

The question is if this is expected behaviour? Should I use some other implementations to sync my Sling instances?



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