Zebra 1.0.0-beta.15

This release improves Zebra's sync and RPC performance, improves test coverage and reliability, and starts creating Docker Hub binaries for releases.

It also changes some of zebra-network's unstable Rust APIs to provide more peer metadata.

Breaking Changes

This release has the following breaking changes:

• Zebra's JSON-RPC server has an isolated thread pool, which is single threaded by default (#4806).
  Multi-threaded RPCs disable port conflict detection, allowing multiple Zebra instances to share
  the same RPC port (#5013).
  To activate multi-threaded RPC server requests, add this config to your zebrad.toml:

[rpc]
parallel_cpu_threads = 0

• Docker users can now specify a custom zebrad config file path (#5163, #5177).
  As part of this feature, the default config path in the Docker image was changed.

• zebrad now uses a non-blocking tracing logger (#5032).
  If the log buffer fills up, Zebra will discard any additional logs.
  Moving logging to a separate thread also changes the timing of some logs,
  this is unlikely to affect most users.

• Zebra's gRPC tests need protoc installed (#5009).
  If you are running Zebra's lightwalletd gRPC test suite, see the tonic README for details.

Added

Releasing Zebra

• Create Docker hub binaries when tagging releases (#5138)
• Document how Zebra is versioned and released (#4917, #5026)
• Allow manual Release Drafter workflow runs (#5165)

Network Peer Rust APIs

Note: Zebra's Rust APIs are unstable, they are not covered by semantic versioning.

• Return peer metadata from connect_isolated functions (#4870)

Testing

• Check that the latest Zebra version can parse previous configs (#5112)
• Test disabled lightwalletd mempool gRPCs via zebrad logs (#5016)

Documentation

• Document why Zebra does a UTXO check that looks redundant (#5106)
• Document how Zebra CI works (#5038, #5080, #5100, #5105, #5017)

Changed

Zebra JSON-RPCs

• Breaking: Add a config for multi-threaded RPC server requests (#5013)
• Isolate RPC queries from the rest of Zebra, to improve performance (#4806)

Zebra State

• Send treestates from non-finalized state to finalized state, rather than re-calculating them (#4721)
• Run StateService read requests without shared mutable chain state (#5132, #5107)
• Move the finalized block queue to the StateService (#5152)
• Simplify StateService request processing and metrics tracking (#5137)

Block Checkpoints

• Update Zebra checkpoints (#5130)

Docker Images

• Breaking: Allow Docker users to specify a custom zebrad config file path (#5163, #5177)

Continuous Integration and Deployment

• Wait 1 day before creating cached state image updates (#5088)
• Delete cached state images older than 2 days, but keep a few recent images
  (#5113, #5124, #5082, #5079)
• Simplify GitHub actions caches (#5104)
• Use 200GB disks for managed instances (#5084)
• Improve test reliability and test output readability (#5014)

Zebra Dependencies

• Breaking: Update prost, tonic, tonic-build and console-subscriber to the latest versions (#5009)
• Upgrade zcash\_script and other shared zcash dependencies (#4926)
• Update deny.toml developer docs and file comments (#5151, #5070)
• Update other Zebra Rust dependencies to the latest versions
  (#5150, #5160, #5176, #5149, #5136, #5135, #5118, #5009, #5074, #5071, #5037, #5020, #4914,
  #5057, #5058, #5047, #4984, #5021, #4998, #4916, #5022, #4912, #5018, #5019)

CI Dependencies

• Update Zebra CI dependencies to the latest versions (#5159, #5148, #5117, #5073, #5029)

Removed

Continuous Integration

• Disable beta Rust tests (#5090, #5024)

Fixed

Logging

• Breaking: Switch zebrad to a non-blocking tracing logger (#5032)

Testing

• Increase full sync timeout to 32 hours (#5172, #5129)
• Disable unreliable RPC port conflict tests on Windows and macOS (#5072)
• Increase slow code log thresholds to reduce verbose logs and warnings (#4997)

Continuous Integration

• Fix full sync CI failures by adding an extra GitHub job (#5166)
• Make checkpoint disk image names short enough for Google Cloud (#5128)
• Label lightwalletd cached state images with their sync height (#5086)

Lints

• Fix various Rust clippy lints (#5131, #5045)
• Fix a failure in tj-actions/changed-files on push (#5097)

Documentation

• Enable all cargo features in Zebra's deployed documentation (#5156)

Security

JSON-RPC Server

• Isolate RPC queries from the rest of Zebra, so that lightwalletd clients are more isolated from each other (#4806)