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CHANGELOG.md

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changelog

0.4

0.4.3 (unreleased)

Added a few convenience derivations.

  • Derive Eq on messages::MembershipConfig.
  • Derive Eq on metrics::State.
  • Derive PartialEq & Eq on metrics::RaftMetrics.
  • Update development dependencies.

0.4.2

A few QOL improvements.

  • Fixed an issue where the value for current_leader was not being set to None when becoming a candidate. This isn't really a bug per se, as no functionality depended on this value as far as Raft is concerned, but it is an issue that impacts the metrics system. This value is now being updated properly.
  • Made the messages::ClientPayload::new_base constructor pub(crate) instead of pub, which is what the intention was originally, but I was apparently tired :).
  • Implemented #25. Implementing Display+Error for the admin error types.

0.4.1

A few bug fixes.

  • Fixed an issue where a node in a single-node Raft was not resuming as leader after a crash.
  • Fixed an issue where hard state was not being saved after a node becomes leader in a single-node Raft.
  • Fixed an issue where the client request pipeline (a Stream with the actix::StreamFinish) was being closed after an error was returned during processing of client requests (which should not cause the stream to close). This was unexpected and undocumented behavior, very simple fix though.

0.4.0

This changeset introduces a new AppDataResponse type which represents a concrete data type which must be sent back from the RaftStorage impl from the ApplyEntryToStateMachine handler. This provides a more direct path for returning application level data from the storage impl. Often times this is needed for responding to client requests in a timely / efficient manner.

  • AppDataResponse type has been added (see above).
  • A few handlers have been updated in the RaftStorage type. The handlers are now separated based on where they are invoked from the Raft node. The three changed handlers are:
    • AppendEntryToLog: this is the same. It is the initial step of handling client requests to apply an entry to the log. This is still where application level errors may be safely returned to the client.
    • ReplicateToLog: this is for replicating entries to the log. This is part of the replication process.
    • ApplyEntryToStateMachine: this is for applying an entry to the state machine as the final part of a client request. This is where the new AddDataResponse type must be returned.
    • ReplicateToStateMachine: this is for replicating entries to the state machine. This is part of the replication process.

0.3

0.3.1

Overhauled the election timeout mechanism. This uses an interval job instead of juggling a rescheduling processes. Seems to offer quite a lot more stability. Along with the interval job, we are using std::time::Instants for performing the comparisons against the last received heartbeat.

0.3.0

Another backwards incompatible change to the RaftStorage trait. It is now using associated types to better express the needed trait constraints. These changes were the final bit of work needed to get the entire actix-raft system to work with a Synchronous RaftStorage impl. Async impls continue to work as they have, the RaftStorage impl block will need to be updated to use the associated types though. The recommend pattern is as follows:

impl RaftStorage<..., ...> for MyStorage {
    type Actor = Self;
    type Context = Context<Self>; // Or SyncContext<Self>;
}

My hope is that this will be the last backwards incompatible change needed before a 1.0 release. This crate is still young though, so we will see.

0.2

0.2.0

  • Made a few backwards incompatible changes to the RaftStorage trait. Overwrite its third type parameter with actix::SyncContext<Self> to enable sync storage.
  • Also removed the RaftStorage::new constructor, as it is a bit restrictive. Just added some docs instead describing what is needed.

0.1

0.1.3

  • Added a few addition top-level exports for convenience.

0.1.2

  • Changes to the README for docs.rs.

0.1.1

  • Changes to the README for docs.rs.

0.1.0

  • Initial release!