nats-io/nats-server v2.12.0-preview.2

Release v2.12.0-preview.2

on GitHub

Changelog

This release also contains all changes up to and including v2.11.8.

Go Version

• 1.25.0 (#7166)

Added

General

• Exponential backoff on route/gateway reconnection attempts (#7042, #7048)
• Added allow_insecure_cipher_suites configuration option to tls block, as insecure ciphers are now disabled by default (#7144)
• No responders errors from the server now include the original subject in the Nats-Subject header (#5250)

JetStream

• Atomic batch publishes (#6966, #7057, #7060, #7085, #7090, #7091, #7119, #7152, #7175)
  • Stage-and-commit style batches for JetStream message publishes with normal consistency checks
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-50.md
• Counter streams (#6973, #6988, #7081, #7118)
  • Counters are incremented or decremented by publishing to the stream with Nats-Incr headers, with full aggregate consistency over sources and mirrors
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-49.md
• Prioritised mode for consumer priority groups (#7113)
  • Allows for low-latency switching between clients based on the priority set
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-42.md
• Added no_hdr flag to message get and direct get API endpoints (#6994)
  • Messages returned with this flag set will not contain headers, allowing fast access to e.g. counter values
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-52.md
• Support for trusted proxies (#7153)
  • Allows enforcing that connections arrive via a NATS protocol-aware proxy
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-55.md
• Added the ability to promote mirrors to normal streams by removing the mirror configuration (#7171)
  • This allows a mirror to take over operation if the original stream is lost, for example in a disaster recovery scenario
  • This operation cannot be undone and also requires configuring the stream subjects to continue operation
• Added delayed message scheduling (#7170)
  • Implements single schedule messages using the Nats-Schedule-TTL message header
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-51.md
• Added support for offline assets (#7158)
  • Streams and consumers from a higher API version or using unsupported features (i.e. after a downgrade) will be marked as offline to prevent corruption
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-44.md
• Added partition(n) for deterministic hash-based partitioning and random(n) for non-deterministic random partitioning to subject transforms (#6950)
• Added the ability to specify the required API level in JetStream API requests with the Nats-Required-Api-Level request header (#7157)
• Add server_metadata block to server config, allowing arbitrary key-pairs to be set on a per-server basis, similar to stream/consumer metadata (#6935)
• Asynchronous flush support for the filestore with the new allow_async_flush stream option (#7018)
• Support for empty votes, which improves how the Raft election logic handles nodes that have lost their stable storage and attempt to rejoin the cluster regardless (#7038)
• Added "leader_since" to the stream and consumer info responses (#7189)

Leafnodes

• Added the ability to isolate leafnode subject interest propagation with the hub-side isolate_leafnode_interest configuration option, suppressing east-west traffic and reducing subscription overheads when there are many leafnodes (#7238)
• Added disabled option for leafnode remotes, with support for reloading from the config at runtime (#7054)

Changed

JetStream

• The JetStream API level has been increased to 2 (#6969)
• The API surface is now in strict mode by default, erroring if unknown fields are provided in the request body (#7049)
• Replicated streams will now default to async flush as long as sync: always is not configured (#7163)
• The default value for max_buffered_msgs has been increased by 10x to 100,000 messages (#6633)

Improved

General

• When logging closed connections, the remote is now logged if known, making it easier to identify where route/gateway/leafnode connections have dropped (#7077)
• Client-specific log lines now include the account and user if known (#7079)

JetStream

• Raft nodes will no longer respond success to catchup messages and will ignore responses if not leader, fixing some potential stream desync scenarios (#6944)
• The stream leader is now responsible for remapping consumer assignments on scaling/moves, fixing some potential placement races (#7071, #7112, #7083)
• Replicated streams can now be created even if some of the replica nodes are offline (#7075)
• The storage type is now logged when logging resource limits exceeded (#7076)
• JetStream API requests are always handled from the worker pool, improving the semantics of the API request queue and logging when requests take too long (#7125)
• Filestore in-memory caches now use weak pointers and can respond to garbage collector (GC) pressure, which should help to avoid a number of possible out-of-memory scenarios (#7180)

Leafnodes

• Leafnode connections without auth no longer unexpectedly connect to the global account (#7116)

Fixed

JetStream

• Improved validation for stream/consumer configs (#7134)
• An error will now be correctly surfaced when the Nats-Expected-Last-Subject-Sequence-Subject header is supplied but the accompanying Nats-Expected-Last-Subject-Sequence header is not (#7196)

Complete Changes

v2.12.0-preview.1...v2.12.0-preview.2