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@LeftHandCold LeftHandCold released this 26 Aug 14:25
v4.2.1
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Release date: August 26, 2026
MatrixOne version: v4.2.1

MatrixOne 4.2.1 is a feature and reliability update on top of 4.2.0. It adds DATASTREAM external tables and improves query correctness, memory ownership, distributed retry bounds, and lockservice recovery behavior.

Key Improvements

External Data

  • DATASTREAM External Tables: Add ENGINE = DATASTREAM external tables backed by a streaming gRPC data-load bridge, with conservative filter pushdown, optional API-key authentication, and a reference server.

Memory Diagnostics

  • On-Heap MPool Visibility: Expose live Go-heap-backed MPool bytes and objects through global metrics and per-pool diagnostics while preserving explicit ownership and teardown semantics.

Key Bug Fixes

Query Correctness & Resource Management

  • Preserve every nested primary-key OR branch so large parameterized IN queries do not silently lose requested rows.
  • Release query-result metadata batches after serialization and clean partially constructed batches on append failures.
  • Apply deterministic SQL ordering for floating-point NaNs across full sort, Top, MergeTop, MergeOrder, and window paths.

Distributed Reliability

  • Bound stale pipeline backend admission and connection retries by the configured per-connect timeout.
  • Avoid the lock inversion between unknown-commit cleanup and stale-bind fencing that could block subsequent lock requests.

What's Changed

Full Changelog: v4.2.0...v4.2.1

Contributors

fengttt, aunjgr, and 3 other contributors
Assets 4
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