File-Level write-write conflict detection (Generally Available)

Data Warehouse · General availability · Planned

Data Warehouse General availability Planned
Last Modified: May 07, 2026 Release Date: September 08, 2026

Description

This feature is part of the concurrency control strategy for Fabric DW. File-level write-write conflict detection is a mechanism designed to prevent two concurrent transactions from modifying the same physical file in a data warehouse at the same time. More precise than table-level detection (which blocks any concurrent changes to the same table).What It Does?Scope: Operates at the file level (e.g., Parquet files in Fabric DW), rather than at the table or row level.Goal: Detect overlapping changes (updates, deletes) to the same file during concurrent transactions.Trigger: When a transaction tries to commit changes, the system checks if any newer manifests indicate modifications to the same file since the transaction started.Lays groundwork for even finer-grained detection (row-level) in later releases.

📰 Related Blog Article

Resolving Write Conflicts in Microsoft Fabric Data Warehouse
🔗 blog.fabric.microsoft.com

Change History

  1. 2026-04-01
    Release Date 2026-06-09 -> 2026-09-08
  2. 2026-03-02
    Release Date 2026-04-30 -> 2026-06-09
  3. 2025-11-18
    Roadmap Item Added
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