EDB Postgres Distributed 4.4.0 release notes v4.4.0

A bug has been fixed that caused false positives in update-origin-change conflict detection. The fix ensures the correct LSN is used and conflicts are now detected accurately and only when they genuinely occur.

A fix has been implemented to resolve an issue where concurrent updates on non-unique indexes could cause replication to break with a "concurrent INSERT when looking for delete rows" error. This bug was caused by an incorrect comparison of tuples during the lookup process. The fix ensures that the correct tuples are compared, which prevents this error and maintains replication stability.

A bug has been fixed that could cause bdr_init_physical to hang when the upstream node had a synchronous commit scope. This issue, which prevented a new node from completing physical initialization, was caused by a specific interaction with synchronous commit settings. The fix ensures that bdr_init_physical now works reliably in all configurations, even before the new node joins the group and is considered for synchronous commits.

Fixes a bug so a Raft snapshot is correctly created before sending append entries as needed.