Compatibility changes ===================== Many changes in PGD 5 aren’t backward compatible with PGD 4 or PGD 3.7. Connection routing ------------------ HARP Manager doesn’t exist anymore. It’s been replaced by new :ref:`Routing functions ` configuration. HARP Proxy is replaced by similarly functioning PGD Proxy, which removes any deprecated features and is configured through connection management configuration. Commit At Most Once ------------------- CAMO configuration is now done through :ref:`Monitoring commit scopes ` . The ``bdr.camo_pairs`` catalog and any related manipulation functions don’t exist anymore. The ``bdr.enable_camo`` GUC was removed. The ``synchronous_replication_availability`` GUC doesn’t affect CAMO anymore. Use the ``DEGRADE ON ... TO ASYNC`` clause of a commit scope. Eager All-Node Replication -------------------------- The ``global`` scope no longer exists. To create scope with the same behavior, use :ref:`Group commit ` . .. code:: sql SELECT bdr.add_commit_scope( commit_scope_name := eager_scope, origin_node_group := top_group, rule := ALL (top_group) GROUP COMMIT (conflict_resolution = eager, commit_decision = raft) ABORT ON (timeout = 60s), wait_for_ready := true ); The ``bdr.global_commit_timeout`` GUC was removed. Use the ``ABORT ON`` clause for the commit scope. Lag Control ----------- Similarly to CAMO and Eager, Lag Control configuration was also moved to :ref:`Monitoring commit scopes ` for more flexible durability configuration. Catalogs -------- - ``bdr.workers`` doesn’t show worker-specific info like ``worker_commit_timestamp`` anymore. - ``bdr.worker_errors`` is deprecated and lost most of the info. - ``bdr.state_journal_details`` is deprecated and lost most of the info. - ``bdr.event_summary`` replaces ``bdr.worker_errors`` and ``bdr.state_journal_details`` with additional info like Raft role changes. - The table ``bdr.node_catchup_info`` now has the user-consumable view ``bdr.node_catchup_info_details`` , which shows info in a more friendly way. - Witness node is no longer distinguished by the replication sets it replicates but by using the ``node_kind`` value in ``bdr.node_summary`` . - All the Raft (consensus) related tables and functions were adjusted to support multiple Raft instances (sub-group Raft). - ``bdr.node_pre_commit`` view and the underlying table was removed, as the information is no longer stored in a table. - ``bdr.commit_decisions`` view was added and replaces the ``bdr.node_pre_commit`` one. - Multiple internal autopartition tables were replaced by taskmgr ones, as the mechanism behind it was generalized. - ``bdr.network_monitoring`` view was removed along with underlying tables and functions. - Many catalogs were added and some have new columns, as described in `Catalogs `_ . These aren’t breaking changes strictly speaking, but we recommend reviewing them when upgrading.