Commits on Aug 6, 2026

1. Refactor syncrep parsing to represent bare standby lists explicitly

   The syncrep parser currently reduces a simple list form to FIRST 1
   (SYNC_REP_PRIORITY). That is acceptable for synchronous_standby_names,
   but it loses information about whether FIRST was explicitly written.
   Introduce SYNC_REP_DEFAULT to represent the bare list form parsed
   from standby_list. This allows callers to distinguish:
   - explicit priority syntax (FIRST N (...) or N (...))
   - quorum syntax (ANY N (...))
   - simple list syntax without FIRST/ANY
   With this change:
   - syncrep grammar emits SYNC_REP_DEFAULT for bare standby lists
   - check_synchronous_standby_names() maps SYNC_REP_DEFAULT to
     SYNC_REP_PRIORITY, preserving existing synchronous_standby_names
     behavior
   This is a preparatory patch for future synchronized_standby_slots
   changes, where callers can directly interpret SYNC_REP_DEFAULT as
   plain-list semantics, while keeping existing synchronous_standby_names
   semantics intact.
   Per suggestion from Zhijie Hou <houzj.fnst@fujitsu.com>

   

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2. Add ANY N semantics to synchronized_standby_slots

   Extend synchronized_standby_slots with quorum syntax for logical
   failover slot synchronization:
   - ANY N (slot1, slot2, ...)
   Plain-list semantics are preserved as-is:
   - slot1, slot2 continues to mean all listed slots are required
   Implementation details:
   - Reuse syncrep parser infrastructure in the GUC check hook and
     map parsed output into synchronized_standby_slots semantics.
   - Consume SYNC_REP_DEFAULT from the preparatory parser refactor to
     distinguish plain-list syntax from explicit parser modes.
   - In StandbySlotsHaveCaughtup(), enforce mode-specific behavior for:
     - existing all-listed-slots semantics (plain list)
     - quorum N-of-M behavior (ANY N)
   - Validation rejects configurations where N exceeds the number of
     listed slots.
   - Ignore duplicate synchronized_standby_slots entries, preserving the
     first occurrence and applying semantics to the resulting unique list.
   - Clarify synchronized_standby_slots comments and lagging restart_lsn
     reporting to match the implemented behavior.
   Tests and docs:
   - Add recovery coverage for plain-list behavior and ANY quorum
     behavior, including lagging-slot and validation-error scenarios.
   - Add duplicate-entry recovery coverage for synchronized_standby_slots.
   - Document ANY syntax and clarify plain-list behavior for this GUC.
   - Document that duplicate slot names are ignored and counted only once.
   Author: Satya Narlapuram <satyanarlapuram@gmail.com>
   Author: Ashutosh Sharma <ashu.coek88@gmail.com>
   Reviewed-by: Shveta Malik <shveta.malik@gmail.com>
   Reviewed-by: Ajin Cherian <itsajin@gmail.com>
   Reviewed-by: Hou, Zhijie <houzj.fnst@fujitsu.com>
   Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
   Reviewed-by: Surya Poondla <suryapoondla4@gmail.com>
   Reviewed-by: Japin Li <japinli@hotmail.com>
   Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com>

   

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3. Add FIRST N and N (...) priority syntax to synchronized_standby_slots

   Extend synchronized_standby_slots to support explicit priority
   forms aligned with synchronous_standby_names.
   - FIRST N (slot1, slot2, ...)
   - N (slot1, slot2, ...) as shorthand for FIRST N
   Implementation details:
   - Use the SYNC_REP_DEFAULT parser distinction from the earlier
     refactor so plain-list syntax remains separate from priority
     syntax.
   - Extend StandbySlotsHaveCaughtup() priority handling.
   - Select slots in list order.
   - Skip missing, logical, invalidated, and inactive lagging slots.
   - Wait for active lagging higher-priority slots.
   - Clarify duplicate handling for priority syntax in the
     synchronized_standby_slots documentation.
   - Simplify caught-up comments and clarify standby confirmation
     wait comments to match the final control flow.
   Tests and docs:
   - Add coverage for FIRST behavior and shorthand N (...) behavior.
   - Add plain-list disambiguation with first-prefixed slot names.
   - Add FIRST duplicate-entry recovery coverage to show duplicates
     do not create extra priority positions.
   - Update docs for FIRST and shorthand priority syntax semantics.
   - Clarify that duplicate slot names are ignored in priority-based
     forms and preserve first-occurrence order.
   Author: Satya Narlapuram <satyanarlapuram@gmail.com>
   Author: Ashutosh Sharma <ashu.coek88@gmail.com>
   Reviewed-by: Shveta Malik <shveta.malik@gmail.com>
   Reviewed-by: Ajin Cherian <itsajin@gmail.com>
   Reviewed-by: Hou, Zhijie <houzj.fnst@fujitsu.com>
   Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
   Reviewed-by: Surya Poondla <suryapoondla4@gmail.com>
   Reviewed-by: Japin Li <japinli@hotmail.com>
   Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com>

   

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