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Doc: add change-log for 0.9.2
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‎change-log.md

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## v0.9.2
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Summary:
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- Added:
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- [8b54a80f](https://github.com/datafuselabs/openraft/commit/8b54a80f6e5b06a181f12f55179e0928a470e21b) `Raft::config()` returns a ref to Config this raft node uses.
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- [7d5326ce](https://github.com/datafuselabs/openraft/commit/7d5326ce7b5534c93300eabbcefa0c4d3d45284e) add `RaftMetrics::millis_since_quorum_ack`.
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- Improved:
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- [d4a3053f](https://github.com/datafuselabs/openraft/commit/d4a3053fa7b77fbe7db4fc7e598785b8f4d78676) Update example network err implementation.
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- [d2d155db](https://github.com/datafuselabs/openraft/commit/d2d155db1e10a619a0bf82710db200ab43afd113) Use `Unreachable` error in `examples/raft-kv-rocksdb`.
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- Fixed:
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- [17795e7f](https://github.com/datafuselabs/openraft/commit/17795e7f08bedc3417438aff2486fad261465225) Ensure heartbeat results are returned to `RaftCore`.
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- [768dfdc9](https://github.com/datafuselabs/openraft/commit/768dfdc9cc1ce5ea1b985dd00274ae8221764ef9) Ensure `RaftMetrics` are sent after `RaftDataMetrics` and `RaftServerMetrics`.
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Detail:
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### Added:
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- Added: [8b54a80f](https://github.com/datafuselabs/openraft/commit/8b54a80f6e5b06a181f12f55179e0928a470e21b) `Raft::config()` returns a ref to Config this raft node uses; by 张炎泼; 2024-03-14
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- Added: [7d5326ce](https://github.com/datafuselabs/openraft/commit/7d5326ce7b5534c93300eabbcefa0c4d3d45284e) add `RaftMetrics::millis_since_quorum_ack`; by 张炎泼; 2024-03-15
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`RaftMetrics::millis_since_quorum_ack` is the interval in milliseconds
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since the last timestamp a quorum acknowledged.
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This duration is used by the application to assess the likelihood that
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the leader has lost synchronization with the cluster.
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A longer duration without acknowledgment may suggest a higher
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probability of the leader being partitioned from the cluster.
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### Improved:
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- Improved: [d4a3053f](https://github.com/datafuselabs/openraft/commit/d4a3053fa7b77fbe7db4fc7e598785b8f4d78676) Update example network err implementation; by Jonah Nestrick; 2024-03-15
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Update the example to return unreachable error for connection errors to
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prevent immediate retries.
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- Improved: [d2d155db](https://github.com/datafuselabs/openraft/commit/d2d155db1e10a619a0bf82710db200ab43afd113) Use `Unreachable` error in `examples/raft-kv-rocksdb`; by 张炎泼; 2024-03-14
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### Fixed:
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- Fixed: [17795e7f](https://github.com/datafuselabs/openraft/commit/17795e7f08bedc3417438aff2486fad261465225) Ensure heartbeat results are returned to `RaftCore`; by 张炎泼; 2024-03-17
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Previously, the heartbeat results were not sent back to
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`RaftCore`, which requires these results to calculate the **last
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timestamp acknowledged by a quorum**.
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This commit resolves the issue by ensuring that the heartbeat RPC
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results are sent back to `RaftCore`, allowing it to correctly update the
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**last timestamp acknowledged by a quorum**.
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- Fixed: [768dfdc9](https://github.com/datafuselabs/openraft/commit/768dfdc9cc1ce5ea1b985dd00274ae8221764ef9) Ensure `RaftMetrics` are sent after `RaftDataMetrics` and `RaftServerMetrics`; by 张炎泼; 2024-03-19
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This commit addresses an issue where `RaftMetrics` could be sent before
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`RaftDataMetrics` and `RaftServerMetrics`. Since `Wait` relies solely on
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`RaftMetrics` to reflect the latest state, it is crucial that
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`RaftMetrics` are dispatched only after the other two metrics have been
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updated. This change guarantees that once a change in `RaftMetrics` is
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detected, it accurately represents the most recent changes from both
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`RaftDataMetrics` and `RaftServerMetrics`.
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## v0.9.0
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Summary:

‎change-log/v0.9.2.md

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Summary:
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- Added:
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- [8b54a80f](https://github.com/datafuselabs/openraft/commit/8b54a80f6e5b06a181f12f55179e0928a470e21b) `Raft::config()` returns a ref to Config this raft node uses.
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- [7d5326ce](https://github.com/datafuselabs/openraft/commit/7d5326ce7b5534c93300eabbcefa0c4d3d45284e) add `RaftMetrics::millis_since_quorum_ack`.
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- Improved:
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- [d4a3053f](https://github.com/datafuselabs/openraft/commit/d4a3053fa7b77fbe7db4fc7e598785b8f4d78676) Update example network err implementation.
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- [d2d155db](https://github.com/datafuselabs/openraft/commit/d2d155db1e10a619a0bf82710db200ab43afd113) Use `Unreachable` error in `examples/raft-kv-rocksdb`.
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- Fixed:
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- [17795e7f](https://github.com/datafuselabs/openraft/commit/17795e7f08bedc3417438aff2486fad261465225) Ensure heartbeat results are returned to `RaftCore`.
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- [768dfdc9](https://github.com/datafuselabs/openraft/commit/768dfdc9cc1ce5ea1b985dd00274ae8221764ef9) Ensure `RaftMetrics` are sent after `RaftDataMetrics` and `RaftServerMetrics`.
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Detail:
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### Added:
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- Added: [8b54a80f](https://github.com/datafuselabs/openraft/commit/8b54a80f6e5b06a181f12f55179e0928a470e21b) `Raft::config()` returns a ref to Config this raft node uses; by 张炎泼; 2024-03-14
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- Added: [7d5326ce](https://github.com/datafuselabs/openraft/commit/7d5326ce7b5534c93300eabbcefa0c4d3d45284e) add `RaftMetrics::millis_since_quorum_ack`; by 张炎泼; 2024-03-15
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`RaftMetrics::millis_since_quorum_ack` is the interval in milliseconds
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since the last timestamp a quorum acknowledged.
23+
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This duration is used by the application to assess the likelihood that
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the leader has lost synchronization with the cluster.
26+
A longer duration without acknowledgment may suggest a higher
27+
probability of the leader being partitioned from the cluster.
28+
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### Improved:
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- Improved: [d4a3053f](https://github.com/datafuselabs/openraft/commit/d4a3053fa7b77fbe7db4fc7e598785b8f4d78676) Update example network err implementation; by Jonah Nestrick; 2024-03-15
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Update the example to return unreachable error for connection errors to
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prevent immediate retries.
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- Improved: [d2d155db](https://github.com/datafuselabs/openraft/commit/d2d155db1e10a619a0bf82710db200ab43afd113) Use `Unreachable` error in `examples/raft-kv-rocksdb`; by 张炎泼; 2024-03-14
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### Fixed:
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- Fixed: [17795e7f](https://github.com/datafuselabs/openraft/commit/17795e7f08bedc3417438aff2486fad261465225) Ensure heartbeat results are returned to `RaftCore`; by 张炎泼; 2024-03-17
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Previously, the heartbeat results were not sent back to
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`RaftCore`, which requires these results to calculate the **last
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timestamp acknowledged by a quorum**.
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This commit resolves the issue by ensuring that the heartbeat RPC
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results are sent back to `RaftCore`, allowing it to correctly update the
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**last timestamp acknowledged by a quorum**.
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- Fixed: [768dfdc9](https://github.com/datafuselabs/openraft/commit/768dfdc9cc1ce5ea1b985dd00274ae8221764ef9) Ensure `RaftMetrics` are sent after `RaftDataMetrics` and `RaftServerMetrics`; by 张炎泼; 2024-03-19
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This commit addresses an issue where `RaftMetrics` could be sent before
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`RaftDataMetrics` and `RaftServerMetrics`. Since `Wait` relies solely on
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`RaftMetrics` to reflect the latest state, it is crucial that
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`RaftMetrics` are dispatched only after the other two metrics have been
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updated. This change guarantees that once a change in `RaftMetrics` is
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detected, it accurately represents the most recent changes from both
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`RaftDataMetrics` and `RaftServerMetrics`.

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