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v0.6.2-alpha.4.md

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Changed:

  • Changed: 954c67a9 InstallSnapshotRequest: merge last_included{term,index} into last_included; by drdr xp; 2021-07-08

  • Changed: 933e0b32 use snapshot-id to identify a snapshot stream; by drdr xp; 2021-07-09

    A snapshot stream should be identified by some id, since the server end should not assume messages are arrived in the correct order. Without an id, two install_snapshot request belonging to different snapshot data may corrupt the snapshot data, explicitly or even worse, silently.

    • Add SnapshotId to identify a snapshot stream.

    • Add SnapshotSegmentId to identify a segment in a snapshot stream.

    • Add field snapshot_id to snapshot related data structures.

    • Add error RaftError::SnapshotMismatch.

    • Storage::create_snapshot() does not need to return and id. Since the receiving end only keeps one snapshot stream session at most. Instead, Storage::do_log_compaction() should build a unique id everytime it is called.

    • When the raft node receives an install_snapshot request, the id must match to continue. A request with a different id should be rejected. A new id with offset=0 indicates the sender has started a new stream. In this case, the old unfinished stream is dropped and cleaned.

    • Add test for install_snapshot API.

  • Changed: 85859d07 CurrentSnapshotData: merge term and index into included.; by drdr xp; 2021-07-09

  • Changed: 5eb9d3af RaftCore: replace snapshot_index with snapshot_last_included: LogId. Keep tracks of both snapshot last log term and index.; by drdr xp; 2021-07-09

    Also SnapshotUpdate::SnapshotComplete now contains an LogId instead of an u64 index.

  • Changed: 9c5f3d7e RaftCore: merge last_log_{term,index} into last_log: LogId; by drdr xp; 2021-07-09

  • Changed: 58d8e3a2 AppendEntriesRequest: merge prev_log_{term,index} into prev_log: LogId; by drdr xp; 2021-07-10

  • Changed: 9e4fb64f InitialState: last_log_{term,index} into last_log: LogId; by drdr xp; 2021-07-10

  • Changed: 24e38130 Entry: merge term and index to log_id: LogId; by drdr xp; 2021-07-11

Added:

  • Added: 8e0b0df9 report snapshot metrics to RaftMetrics::snapshot, which is a LogId: (term, index) that a snapshot includes; by drdr xp; 2021-07-09

    • Add: Wait.snapshot() to watch snapshot changes.
    • Test: replace sleep() with wait_for_snapshot() to speed up tests.