pglogical Release Notes v3.6

pglogical 3.6.33

This is a maintenance release for PGLogical 3.6 which includes fixes for issues identified previously.

Don't replicate TRUNCATE as global message (BDR-2821, RT87453)
The TRUNCATE command now takes the replication set into account.

Upgrades

This release supports upgrading from following versions of pglogical:

3.6.23 and higher
2.4.0 and 2.4.1
2.3.3 and 2.3.4

pglogical 3.6.32

This is a maintenance release for PGLogical 3.6. It is equivalent to 3.6.31, but still gets a release and a version bump to match the BDR version number.

Upgrades

This release supports upgrading from following versions of pglogical:

3.6.23 and higher
2.4.0 and 2.4.1
2.3.3 and 2.3.4

pglogical 3.6.31

This is a maintenance release for PGLogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Keep the lock_timeout as configured on non-CAMO-partner BDR nodes (BDR-1916)
A CAMO partner uses a low lock_timeout when applying transactions from its origin node. This was inadvertently done for all BDR nodes rather than just the CAMO partner, which may have led to spurious lock_timeout errors on pglogical writer processes on normal BDR nodes.
Prevent walsender processes spinning when facing lagging standby slots (RT80295, RT78290)
Correct signaling to reset a latch so that a walsender process does consume 100% of a CPU in case one of the standby slots is lagging behind.

Upgrades

This release supports upgrading from following versions of pglogical:

3.6.23 and higher
2.4.0 and 2.4.1
2.3.3 and 2.3.4

pglogical 3.6.30

This is a maintenance release for PGLogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Push snapshot in SPI writer for every transaction (RT76368)
This is required in newer versions of Postgres.

Upgrades

This release supports upgrading from following versions of pglogical:

3.6.23 and higher
2.4.0 and 2.4.1
2.3.3 and 2.3.4

pglogical 3.6.29

This is a maintenance release for PGLogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Stop replication in case of a CAMO misconfiguration (RT74906, BDR-1724)
In case a normal BDR node was treated as a CAMO partner, but it itself is not configured as such via bdr.camo_partner_of, the node applied all transactional changes, but did not ever commit them. Correct this to throw a FATAL error and halt replication instead of silently ignoring transactions. This will allow for the node to resume replication once configured properly.

pglogical 3.6.28

This is a maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Don't wait on own replication slot when waiting for standby_slot_names (RT74036)
The walsenders that use slots named in standby_slot_names should not wait for anything, otherwise we might wait forever.
Close partitions when get replication info about tables in repsets (RT74658)
The partitions are skipped as the replication is handeld from the parent table, these partitions were not closed, thus issuing the reference leak warning.
Enabling async conflict resolution for explicit 2PC (BDR-1609, RT71298)
Continue applying the transaction using the async conflict resolution for explicit two phase commit.

Improvements

Allow upgrades from pglogical 2.4.1

pglogical 3.6.27

This is a maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Don't materialize remote tuple slot for conflict reporting (BDR-734, RT71005)
Otherwise we might fill in defaults for any missing columns instead of keeping the existing value.
Don't drop temporary synchronization replication slots which may still be needed by the synchronization connection (BDR-647, RT70760, RT68455, RT68352)
Instead of doing cleanup periodically in the background, make the walsender that creates the slot responsible for the cleanup. Similar to how native temporary slots work in newer versions of PostgreSQL.
Fix memory leak in the pglogical COPY handler (BDR-1219, RT72091)
This fixes memory leak when synchronizing large tables.
Fix snapshot handling around our internal executor processing (BDR-904)
Recent changes in PostgreSQL uncovered minor issues in snapshot handling in row filtering and slot manipulation. This is mostly to improve compatibility with latest minor version of PostgreSQL.

Improvements

Allow upgrades from pglogical 2.4.0
Allow binary and internal protocol on more hardware combinations. This currently only affects internal testing.

pglogical 3.6.26

This is a security and maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Fix pg_dump/pg_restore execution (CVE-2021-3515) Correctly escape the connection string for both pg_dump and pg_restore so that exotic database and user names are handled correctly.
Reported by Pedro Gallegos
Fix potential divergence after physical failover (BDR-365, RT68894, RM19886)
The pglogical.standby_slot_names setting now also protects subscriber standbys using those slots from being behind. Previously the slot on provider could move ahead of subscriber's standby causing data loss on failover of subscriber to that standby. Configuring pglogical.standby_slot_names on the subscriber for stanbys that are promotion targets prevents this issue now.
Fix writer crash caused by concurrent relcache invalidation (RT70549) This crash is caused by a race with concurrent relcache invalidation deliveries. This was triggered by concurrent execution of commands that invalidate whole relcache (for example VACUUM FULL).
Don't re-enter worker error handling loop recursive
This should help make what happens clearer in any cases where we do encounter errors during error processing.

Other Changes

Document pglogical.alter_subscription_set_conflict_resolver
This functions allows configuration of conflict resolution used for the subscription.

Upgrades

This release supports upgrading from following versions of pglogical:

2.3.3
2.3.4
3.6.23 and higher

pglogical 3.6.25

This is a security and maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Correctly set verbosity of pg_ctl command when executed from pglogical_create_subscriber
The pg_ctl was always executed in silent mode even when -v option was given to pglogical_create_subscriber in previous versions of pglogical.
This allows for getting more meaningful troubleshooting information when analyzing issues with pglogical_create_subscriber.

Other Changes

Optimize utility command processing (RT69617)
For commands that won't affect any DB objects and don't affect pglogical we can skip the processing early without reading any pgl or system catalogs or calling to DDL replication plugin interfaces.
This is optimization for systems with large number of such utility command calls (for example using pglogical in transaction pooling).

pglogical 3.6.24

This is a security and maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Correct cleanup of dead synchronization slots (RT69227)
Instead of statistics, use the internal process list to reliably find backends for a given xmin.

pglogical 3.6.23

This is a security and maintenance release for pglogical 3.6 which includes fixes for issues identified previously.

Resolved Issues

Don't replicate DDL on temporary objects (RM19491, RT69170) Don't replicate CREATE or DROP statements on objects(table, function, procedure, type and sequence) if they are on the "pg_temp" schema.

Other Changes

Make smart shutdown of writer timeout after half of wal_receiver_timeout (RM19310) Otherwise it might get stuck forever when waiting in Postgres internal code.
Add initial support for upgrades from 2.3.3
Drop support for upgrading from long deprecated version 3.2, 3.3, 3.4 and 3.5

pglogical 3.6.22

This is a security and maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Resolved Issues

Ensure that pglogical.standby_slot_names takes effect when pglogical.standby_slots_min_confirmed is at the default value of -1.
On 3.6.21 and older pglogical.standby_slot_names was ignored if pglogical.standby_slot_names is set to zero (RM19042).
Clusters satisfying the following conditions may experience inter-node data consistency issues after a provider failover:
- Running pglogical 3.0.0 through to 3.6.21 inclusive;
- Using pglogical subscriptions/or providers directly (BDR3-managed subscriptions between pairs of BDR3 nodes are unaffected);
- Have a physical standby (streaming replica) of a pglogical provider intended as a failover candidate;
- Have pglogical.standby_slot_names on the provider configured to list that physical standby;
- Have left pglogical.standby_slots_min_confirmed unconfigured or set it explicitly to zero;
This issue can cause inconsistencies between pglogical provider and subscriber and/or between multiple subscribers when a provider is replaced using physical replication based failover. It's possible for the subscriber(s) to receive transactions committed to the pre-promotion original provider that will not exist on the post-promotion replacement provider. This causes provider/subscriber divergence. If multiple subscribers are connected to the provider, each subscriber could also receive a different subset of transactions from the pre-promotion provider, leading to inter-subscriber divergence as well.
The pglogical.standby_slots_min_confirmed now defaults to the newly permitted value -1, meaning "all slots listed in pglogical.standby_slot_names". The default of 0 on previous releases was intended to have that effect, but instead effectively disabled physical-before-logical replication.
To work around the issue on older versions the operator is advised to set pglogical.standby_slots_min_confirmed = 100 in postgresql.conf. This has no effect unless pglogical.standby_slot_names is also set.
No action is generally required for this issue on BDR3 clusters. BDR3 has its own separate protections to ensure consistency during promotion of replicas.
Fix very rare replication set cache invalidation race condition which could cause crash of a backend or walsender (RM19043, RM19244)
Fix very rare writer relation cache invalidation race condition which could cause crash of the writer (RM19037)

Improvements

Add pglogical.replication_origin_status view which allows pglogical_superuser role to see the status of replication origins.
This is normally visible only to superuser in PostgreSQL itself.
Improve wal_receiver_timeout handling introduced in 3.6.21
Don't timeout on nodes that are doing table resynchronization but are oterwise idle.

pglogical 3.6.21

This is a security and maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Resolved Issues

Fix segmentation fault encountered when adding a partitioned table with many partitions to replication set (RM15733, RT68352)
The segmentation fault was caused by a cache entry of one of the partitions invalidated during copying data to the subscriber. This has been fixed by using a valid cache entry for this purpose.
Fix a failure encountered when adding a large table to replication set (RM18154, RT68455)
pglogical.replication_set_add_table() may fail to add a large table containing millions of rows to a replication set. Similar failure may be seen if the replication takes longer say due to a slow network between publisher and subscriber. Server logs of the subscriber node will indicate START_REPLICATION SLOT command failing with ERROR 42704 "replication slot does not exist". This failure has been fixed by correcting the logic which periodically removes unused replication slots created for synchronizing table being added to the replication set.
Fix crash when running replica triggers on partitions (RM18252)
Prohibit INSERT ON CONFLICT and MERGE (2ndQPostgres) commands on tables without replica identity (RM17323, RT68146)
These commands might end up doing UPDATE or DELETE which would break replication when table does not have any replica identity.
Fix memory leak in executor state cache during the initial data COPY (RM17668)
This was particularly problematic when adding large tables to replication set.
Fix memory leak in writer INSERT processing (RM17668)
Resulted in unusually large memory use when applying of INSERTs that affected many rows.
Fix race condition in invalidation handling of local_sync_status (RM17929)
This could result in receiver waiting forever for the table resynchronization triggered by pglogical.alter_subscription_resynchronize_table() to finish.
Fix rare race condition where reported flush lsn would be ahead of apply lsn (RM18044)
This would mostly cause monitoring queries on provider to show odd values.

Improvements

Document limitations of using primary_conninfo for slot synchronization to a standby (RM14612, RT67443)
Make PGL receiver respect wal_receiver_timeout (RM13805, RT67066)
After an unclean disconnect, the receiver process now terminates once the wal_receiver_timeout is exceeded. This allows it to be restarted and then attempt to reconnect. Prior to this release, the TCP expiration time of the OS applied.

pglogical 3.6.20

This is a security and maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Resolved Issues

Only process keepalives in writer if they come outside of transaction (RT67858)
Keepalives sent in middle of forwarded transactions could move wrong origin forward resulting in skipping future transactions from that origin.
Use timestamp of slot snapshot for initial copy transaction (RM16396)
We can't set commit timestamp of individual rows correctly when doing logical copy during subscription initialization because that would be too slow (every row would have to have separate transaction). But we can use the knowledge that each row had to be committed at or before the snapshot which we use to read the data was taken. So we find the last commit in that snapshot and use the timestamp of that commit.
This helps with time base conflict resolution against the existing data copied during the subscription initialization.
Keep open the connection until pglogical_create_subscriber finishes (RM13649)
Set idle_in_transaction_session_timeout to 0 so we avoid any user setting that could close the connection and invalidate the snapshot.

Improvements

CentOS 8 is now supported, starting with this release.

pglogical 3.6.19

This is a security and maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Resolved Issues

SECURITY: Set search_path to empty for internal PGLogical SQL statements (RM15373)
Also, fully qualify all operators used internally. PGLogical is now protected from attack risks identified in CVE-2018-1058, when the user application avoids the insecure coding practices identified there.
Correct parsing of direct WAL messages (RT67762)
Custom WAL messages emitted by PGLogical (or plugins building on top of it) can be broadcast or direct types. Decoding of the latter was incorrect and could in rare cases (depending on the node name) lead to "insufficient data left in message" or memory allocation errors. Decoding of such direct WAL messages has been corrected.
Add pglogical.sync_failover_slots() function (RM14318)
Signal the supervisor process to restart the mechanism to synchronize the failover slots specifyed in the "pglogical.synchronize_failover_slot_name".
Fix the --extra-basebackup-args argument passed to pg_basebackup (RM14808)
Corrects how the pglogical_create_subscriber tool passes on such extra arguments to pg_backbackup.

Improvements

Add more diagnostic information to pglogical.queue message (RM15292)
A new key info has been added to pglogical.queue providing additional information about a queued DDL operation.

pglogical 3.6.18

This is a maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Improvements

Warn about failover issues if standby_slot_names is not set (RT66767, RM12973) If pglogical.standby_slot_names is not set and a physical standby is configured; failover to this standby will have data consistency issues as per our documentation. However, the replica could just be a simple read replica. In any case, we now warn on the replica about the potential data corruption/divergence that could result if failover is desired to such a standby.
Check repsets in create_subscription for pgl2 upstreams also.
Various improvements to systemtap integration.

Resolved Issues

Prevent a hang in case of an early error in the PGL writer (RT67433, RM14678)
Allow postgres to start with pglogical library loaded but activity suspended
Add start_workers commandline-only GUC to facilitate this.

pglogical 3.6.17

This is a maintenance release for pglogical 3.6 which includes minor features as well as fixes for issues identified previously.

Improvements

Make the slot synchronization to standby more configurable (RM13111)
Added several new configuration parameters which tune the behavior of the synchronization of logical replication slots from a primary to a standby PostgreSQL servers. This allows for better filtering, inclusion of non-pglogical replication sets and also using different connection string than physical replication uses (useful when different user or database should be used to collect information about slots).

Resolved Issues

Fix issue with UPDATEs on partitions with different physical row representation than partition root (RM13539, RT67045)
The partitions must have same logical row as partition root they can have different physical representation (primarily due to dropped columns). UPDATEs on such partitions need to do special handling to remap everything correctly otherwise constraints and not-updated TOAST columns will refer to wrong incoming data.
Fix truncation of \_tmp slot names in sync slots
Long slot names could previously cause the temporary slot to be suffixed by \_tm rather than the expected \_tmp suffix.

Support, Diagnostic and Logging Changes

These changes don't directly change existing behaviour or add new user-facing features. They are primarily of interest to 2ndQuadrant support operations and for advanced diagnostic analysis.

Expand non-invasive tracing (SystemTap, linux-perf, DTrace, etc) support to cover inspection of the pglogical receiver's input protocol stream, walsender output plugin protocol stream, and other useful events. (RM13517)
Add a test and debug utility that decodes captured pglogical protocol streams into human-readable form (RM13538)
Improve error context logging in the pglogical writer to show more information about the transaction being applied and its origin.
Fix incorrectly reported commit lsn in errcontext messages from the pglogical heap writer (RM13796). This fix only affects logging output. The writer would report the lsn of the original forwarded transaction not the lsn of the immediate source transaction.
Add subscription, local node and peer node names to heap writer errcontext log output.

pglogical 3.6.16

This is the sixteenth minor release of the Pglogical 3.6 series. This release includes mostly just enables BDR 3.6.16 without any significant changes to pglogical.

pglogical 3.6.15

This is the fifteenth minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Resolved Issues

Fix backwards-compatibility to PGLogical 2 (RM13333, RT66919)
Recent releases performed additional checks during create_subscription, which are fine against other PGLogical 3 installations, but not backwards-compatible. This release corrects the check to account for backwards-compatibility.
Correct a warning about GUC nest level not being reset (EE) (RM13375)
The addition of the lock_timeout in 3.6.14 led to a warning being issued for CAMO and Eager All Node transaction ("GUC nest level = 1 at transaction start"). With this release, GUC nest levels are properly managed and the warning no longer occurs.

Improvements

Add a new pglogical.worker_tasks view that tracks and records pglogical's background worker use. The view exposes information about the number of times a given type of worker has been restarted, how long it has been running, whether it accomplished any useful work, and more. This offers administrators more insight into pglogical's internal activity when diagnosing problems, especially when joined against the pglogical.worker_error table.
Add support for rate-limiting pglogical background worker (re)launches. The new pglogical.min_worker_backoff_delay configuration option sets a minimum delay between launches of all types of pglogical background workers so that rapid respawning of workers cannot fill the log files and or excessive load on the system that affects other operations.
For example, if configured with pglogical.min_worker_backoff_delay = '500ms', pglogical will not retry any given background worker startup more often than twice per second (1000/500 = 2).
A simple fixed-rate factor was deemed to be the most predictable and production-safe initial approach. Future enhancements may add a heuristic delay factor based on worker type, time from start to exit, number of recent launches, etc.
The launch backoff delay defaults to 0 (off) to prevent surprises for upgrading users.
A setting of pglogical.min_worker_backoff_delay = '5s' or similar is a reasonable starting point, and may become the default in a future release.

Upgrades

The PostgreSQL Global Development Group has phased out support for PostgreSQL 9.4 on all Debian based distributions. Following that, this release covers only PostgreSQL 9.5 and newer. We advise to upgrade to a newer version.

For RedHat based distributions, this release is still available for PostgreSQL 9.4.

pglogical 3.6.14

This is the fourteenth minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Resolved Issues

Resolve deadlocked CAMO or Eager transactions (RM12903, RM12910)
Add a lock_timeout as well as an abort feedback to the origin node to resolve distributed deadlocking due to conflicting primary key updates. This also prevents frequent restarts and retries of the PGL writer process for Eager All Node and sync CAMO transactions.

pglogical 3.6.12

This is the twelveth minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Improvements

Add infrastructure for check_full_row in DELETE operations used by BDR 3.6.12 (RT66493)
Validate requested replication sets at subscribe time (RM12020, RT66310)
pglogical.create_subscription() now checks that all requested replication sets actually exist on the provider node before returning. If any are missing it will raise an ERROR like:
ERROR: replication set(s) "nonexistent_repset" requested by subscription are missing on provider
with a DETAIL message listing the full sets requested, etc.
On prior releases subscriptions with missing repsets would fail after pglogical.create_subscription(...) returned, during initial sync. The failure would only be visible in the logs where it is much less obvious to the user. Or if schema sync was not enable they could appear to succeed but not populate the initial table contents.

Resolved Issues

Fix a potential deadlock at CAMO partner startup. (RM12187)
After a restart, the CAMO partner resends all confirmations for recent CAMO protected transactions. In case these fill the internal queue between the receiver and writer processes, a deadlock was possible. This release ensures the receiver consumes pending feedback messages allowing the writer to make progress.

pglogical 3.6.11

This is the eleventh minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Improvements

Implement remote_commit_flush for CAMO. (RM11564)
Additional level of robustness for CAMO, only replying when xact is known committed and flushed on partner node.
Make receiver-writer shared queues of configurable size. (RM11779)
Two new GUCs are introduced: pglogical.writer_input_queue_size (default 1MB) pglogical.writer_output_queue_size (default 1MB)
Add a warning when user tries to set update_origin_change to skip
Add callback to request replay progress update. (RM6747)

Resolved Issues

Send TimeZone GUC when replicating DDL (RT66019)
To ensure that timezone dependent expressions in DDL get evaluated to same value on all nodes.
Only use isvalid indexes when searching for conflicts (RT66036)
Indexes currently being created or failed index creations will be ignored, to prevent concurrency issues with change apply and CREATE INDEX CONCURRENTLY.
Fix crash when replication invalidations arrive outside a transaction (RM11159)
Make the receiver apply the queue before shutting down (RM11778)
Upon smart shutdown, the PGL writer no longer terminates immediately, requiring queued transactions to be resent, but applies already received transactions prior to shutting down.

pglogical 3.6.10

This is the tenth minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Improvements

Add support for a CAMO remote_write mode (RM6749)

Resolved Issues

COMMIT after initial sync of a table. This avoids treating the first catchup xact as if it was part of the initial COPY, which could lead to strange errors or false conflicts. (RM11284).
Remove the 4 billion row limit during the initial subscription synchronization (RT66050).
Cleanup table replication cache when replication set configuration changes.
Previously we could use stale cache on multiple calls for table replication info on same connection if user changed the configuration in meantime. This could result in initial sync missing replicated table if the configuration was changed while the subscription was being created.
Remember repsets when caching table replication info.
If the client calls the table replication info with different parameters, we need to remember them otherwise we might return cached value for wrong replication sets. This could result in initial sync copying data from table which were not supposed to be replicated.

pglogical 3.6.9

This is the ninth minor release of the Pglogical 3.6 series. This release includes minor improvements.

Improvements

Add support for local, remote_apply and remote_write. (RM11069, RT65801)
We now accept the use of all the values that PostgreSQL accepts when configuring the "pglogical.synchronous_commit".
Immediately forward all messages from the PGL receiver back to origin (BDR CAMO)
Confirmations for CAMO protected transactions flow from the PGL writer applying the transaction back to origin node via the PGL receiver. This process used to consume only one confirmation message per iteration. It now consumes all pending confirmations from the PGL writer and immediately sends them back to the origin. It also decreases latency for BDR CAMO transactions in case confirmations queue up.

pglogical 3.6.8

This is the eigth minor release of the Pglogical 3.6 series. This release includes fixes for issues identified previously.

Resolved Issues

Use RelationGetIndexAttrBitmap to get pkey columns. (RT65676, RT65797)
No need to try to fetch pkey columns from index itself, we have relcache interface that does exactly what we need and does so in more performant way.

pglogical 3.6.7.1

This is a hot-fix release on top of 3.6.7.

Resolved Issues

Fix a protocol violation after removal of an origin. (RT65671, RM10605)
Removal of a replication subscription may lead to a walsender trying to forward data for unknown origins. Prevent emission of an invalid message in that case.

pglogical 3.6.7

pglogical 3.6.7 is the seventh minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified earlier.

Improvements

Replicate TRUNCATE on a partition if only parent table is published in replication set (RT65335)
Previously, we'd skip such TRUNCATE unless the partition was also published.
Generate target_table_missing for TRUNCATE which is executed against non-existing table (RT10291)
Allows for user-configured decision if it should be a replication-stopping issue or not.
Improve performance of repeated UPDATEs and DELETEs executed on origin node by caching the replication configuration of tables in a user session.
Reduce CPU usage of receiver worker when writer queue is full (RM10370).

Resolved Issues

Fix partition replication set membership detection for multi-level partitioned tables
Replicate changes correctly for multi-level partitioned tables, where only the intermediate partition is part of replication set (not root or leaf partitions).
Support replication TRUNCATE CASCADE on tables referenced by FOREIGN KEY (RT65518)
Previously this would throw error on the subscriber. This will only work if all tables on subscriber which have FOREIGN KEY on the table being TRUNCATEd are replicated tables. Also it's only supported on PostgreSQL 11 and higher.
Flush writer between data copy and constraint restore
Otherwise there could in some rare cases still be unapplied changes when creating constraints during initial synchronization of a subscription, potentially causing deadlocks.
Fix potential writer queue corruption on very wide (1000+ columns) tables

Upgrades

This release supports upgrading from following versions of pglogical:

2.2.0
2.2.1
2.2.2
3.2.0 and higher

pglogical 3.6.6

pglogical 3.6.6 is the sixth minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified earlier.

Improvements

New conflict type update_pkey_exists (RM9976)
Allows resolving conflicts when a PRIMARY KEY was updated to one which already exists on the node which is applying the change.
Add pglogical.apply_log_summary (RM6596)
View over pglogical.apply_log which shows the human-readable conflict type and resolver string instead of internal id.
Improve logging during both the initial data synchronization of a subscription and the individual table resynchronization.

Resolved Issues

Make sure writer flushes changes after initial data copy (RT65185)
Otherwise depending on timing and I/O load the subscription might not update positioning info and get data both via initial copy and replication stream catchup that follows.

Upgrades

This release supports upgrading from following versions of pglogical:

2.2.0
2.2.1
2.2.2
3.2.0 and higher

pglogical 3.6.5

pglogical 3.6.5 is the fifth minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified in 3.6.4.

Improvements

Improve tuple lock waits during apply for deletes (RM9569)
This should improve performance of replication of deletes and updates in contentious situation.

Resolved Issues

Use consistent table list in initial data copy (RM9651/RT64809) To prevent issues during initial data copy and concurrent table drop.
Cleanup worker_dsm_handle on worker detach (internal)
Otherwise we could leave dangling DSM segment handle for a worker after a crash, which could confuse plugins using this API.
Fix handling of empty eager transactions (RM9550)
In case no relevant change remains to be applied on a replica node, the prepare of such an empty transaction now works just fine.
Fix the replication sets output in pglogical.pglogical_node_info()
Previously it could be garbled.
Reduce log level for messages when resolving ERRCODE_T_R_SERIALIZATION_FAILUREs (RM9439)

Upgrades

This release supports upgrading from following versions of pglogical:

2.2.0
2.2.1
2.2.2
3.2.0 and higher

Note that upgrades from 2.2.x are only supported on systems with pglogical.conflict_resolution set to last_update_wins.

pglogical 3.6.4

pglogical 3.6.4 is the fourth minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified in 3.6.3.

New Features

Apply statistics tracking (RM9063)
We now track statistics about replication and resource use for individual subscriptions and relations and make them available in pglogical.stat_subscription and pglogical.stat_relation views. The tracking can be configured via pglogical.stat_track_subscription and pglogical.stat_track_relation configuration parameters.
The replicate_inserts option now affects initial COPY
We now do initial copy of data only if the table replicates inserts.

Resolved Issues

Fix initial data copy of multi-level partitioned tables (RT64809)
The initial data copy used to support only single level partitioning, multiple levels of partitioning are now supported.
Don't try to copy initial data twice for partitions in some situations (RT64809)
The initial data copy used to try to copy data from all tables that are in replication sets without proper regard to partitioning. This could result in partition data to be copied twice if both root partition and individual partitions were published via replication set. This is now solved, we only do the initial copy on the root partition if it's published.
Fix handling of indexes when replicating INSERT to a partition (RT64809)
Close the indexes correctly in all situations.
Improve partitioning test coverage (RM9311)
In light of the partitioning related issues, increase the amount of automated testing done against partitioned tables.
Fix a leak in usage of the relation cache (RT64935)
Fix a potential queue deadlock between writer and receiver (RT64935, RT64714)

pglogical 3.6.3

pglogical 3.6.3 is the third minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified in 3.6.2.

New Features

Support DoNotReplicateId special origin
This allows correct handling of "do not replicate" origin which allows skipping replication of some changes. Primarily needed internally for other features.
Persist the last_xact_replay_timestamp (RT63881)
So that it's visible even if the subscription connection is down.
Rework documentation build procedure for better consistency between HTML and PDF documentation
This mainly changes the way docs are structured into chapters so that there is single source of chapter list and ordering for both PDF and HTML docs.

Resolved Issues

Invalidate local cache when adding new invalidation
Fixes visibility of changes in the catalog cache view of the transaction which did those changes. Not triggered yet by any code but will be in the future releases.
Open indexes after partition routing
Otherwise we might be opening indexes of the root table rather than the partition, causing issues with handling conflicts for INSERT operation replication.

pglogical 3.6.2

pglogical 3.6.2 is the second minor release of the pglogical 3.6 series. This release includes minor new features as well as fixes for issues identified in 3.6.1.

New Features

Support DEFERRED UNIQUE indexes
They used to work only in limited cases before this release.
Support covering UNIQUE indexes (RT64650)
The use of covering UNIQUE indexes could result in ambiguous error messages in some cases before.
Add --log-file option to pglogical_create_subscriber (RT64129) So that log can be saved somewhere other than the current working directory

Resolved Issues

Fix error message when the database name in the connection string in pglogical_create_subscriber is missing (RT64129) The previous message was ambiguous.
Raise error when unknown parameter was specified for pglogical_create_subscriber (RT64129)
Otherwise mistakes in command line arguments could be silently ignored.
Solve timing issue with workers exiting while another one tries to start using same worker slot
Before, we could corrupt the worker information causing the newly starting worker to crash (and having to start again later), this will no longer happen.
Set statement time on start of every transaction in pglogical workers (RT64572)
Fixes reporting of xact_start in pg_stat_activity

pglogical 3.6.1

pglogical 3.6.1 is the first minor release of the pglogical 3.6 series. This release includes minor new features and fixes including all the fixes from 3.6.0.1.

New Features

Add slot failover documentation
Add pglogical.get_sub_progress_timestamp for retrieving origin timestamp of the last committed change by the subscription

Resolved Issues

Stop retrying subscription synchronization after unrecoverable error (RT64463)
If the schema synchronization failed (which is an unrecoverable error) don't keep retrying forever. Instead mark the subscription synchronization as failed and disable the subscription.
Improve handling and messaging with missing replication sets in output plugin (RT64451)
Report all missing and found sets and make sure the sets are looked up using current snapshot.

pglogical 3.6.0.1

The pglogical 3.6.0.1 is the first bug-fix release in the pglogical 3.6 series.

Resolved Issues

Improve synchronous remote_write replication performance (RT64397)
Re-add support for binary protocol

pglogical 3.6.0

The version 3.6 of pglogical is a major update which brings performance improvements, better conflict handling, bug fixes and infrastructure necessary for BDR 3.6.

New Features

Significant replication performance improvement
- Cache table synchronization state
- Only send keepalives when necessary
- Only do flush when necessary
- Serialize transactions in fewer cases in walsender (2ndQPostgres)
Improved replication position reporting which is more in line with how physical streaming replication reports it
Conflict detection and resolution improvements
- Add new types of conflicts (like target_table_missing)
- Add new types of conflict resolvers
- Make conflict resolution configurable by subscription and conflict type
- Improve conflict detection for updates

Resolved Issues

Don't try to replicate REINDEX on temporary indexes

Other Improvements

Fix potential message parsing error for two-phase commits
Make initial COPY of data interruptible