Month 2026-03 monthly work summary focusing on key accomplishments and business impact for citusdata/citus. The key feature addressed this month was improving shard move reliability in block_writes mode by fixing idle_in_transaction timeouts on metadata workers. This issue caused shard moves and shard splits to fail when the data copy phase took longer than the idle-transaction timeout on non-participating metadata workers. The fix involved adjusting transaction timeout handling to ensure metadata workers do not terminate unnecessarily, while preserving normal activity for other sessions. The commit that implements the fix and the related code path changes were made with clear documentation and rationale.

January 2026 monthly review for citusdata/citus focused on stability, correctness, and cross-node consistency improvements. Delivered targeted fixes for metadata synchronization with DOMAIN types in non-public schemas and implemented MX-safe restore point semantics to ensure cluster-wide consistency across all metadata and worker nodes. The work enhances reliability during worker onboarding, topology changes, and restore operations, directly supporting safer upgrades and operational stability.

December 2025: Delivered a critical correctness fix for colocated joins under Row Level Security (RLS) in citusdata/citus. Implemented a two-pass algorithm to detect and merge equivalence classes so joins on distribution columns are recognized even when RLS policies use volatile expressions. Added regression tests to ensure this scenario remains reliable. This work improves query correctness under security constraints, enhances planner reliability, and reduces risk of future regressions. Commit: cec2ab84ce574f48b9bcbb7d26545b776750b63d; PR #8357.

In August 2025, two high-impact features were delivered for citusdata/citus, enhancing scalability, availability, and observability. 1) Parallel shard rebalancing enables parallel transfers of reference tables and colocated shards to reduce rebalance windows and increase concurrency. It introduces configurable parallelism and refined locking strategies to maximize throughput while preserving data integrity. 2) Snapshot-based node splits and clone promotion establishes foundational logic for snapshot-driven splits, enabling the promotion of a streaming replica to a primary. This work includes UDFs for registering/managing clone nodes, core promotion and shard rebalancing implementations, a preview split plan, and improved test infrastructure, with refinements to clone replication status messaging.

March 2025 monthly summary for citusdata/citus focusing on the Citus upgrade deadlock mitigation delivered in March 2025. Key outcomes include a robust fix that prevents upgrade-time deadlocks by pre-establishing worker connections, eliminating unnecessary cache lookups for system objects, and thereby reducing cluster stalls and upgrade downtime. The work was tied to commit 95da74c47f4f95361e6b053ef8febcde0fed3f1c with the message 'Fix Deadlock with transaction recovery is possible during Citus upgrades (#7910)'.

November 2024 monthly summary for percona/postgres focused on hardening WAL resource management and expanding encryption key management capabilities within the TDE extension. Delivered a critical bug fix to align WAL RMGR ID with the officially registered value and introduced dynamic key provider switching for the principal key, enabling runtime key management flexibility and better operational control.

2024-10 Monthly summary for percona/postgres: Focused on security, data integrity, and performance improvements in storage and join paths. Delivered encryption optimization in the pg_tde storage manager, refined encryption data handling within SMgrRelation, and fixed a critical decrypted buffer copy bug in MergeJoin. These changes reduce encryption overhead, improve data integrity, and enhance reliability of critical query paths.

In September 2024, the team focused on branding alignment for the percona/postgres repository, delivering a branding update that renames PostgreSQL to Percona Server for PostgreSQL and updates version numbers to reflect branding (17.1.1 and 17.2.1). This work establishes a consistent product identity across recent deliverables and prepares the project for upcoming releases. There were no major bug fixes this month; the changes were isolated to branding and versioning tasks, with no adverse impact on existing functionality.