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Moving a leader during snapshot synchronization can delete committed log entries #133

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negokaz opened this issue Feb 28, 2022 · 0 comments · Fixed by #134
Closed

Moving a leader during snapshot synchronization can delete committed log entries #133

negokaz opened this issue Feb 28, 2022 · 0 comments · Fixed by #134
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@negokaz
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negokaz commented Feb 28, 2022

Expected Behavior

Committed log entries are not deleted except by compaction

Current Behavior

Committed log entries can be deleted by snapshot synchronization

Steps to Reproduce

(It is assumed that the number of nodes is 3)

  1. The leader (m1) stops (or crashes) during the follower (m2) is synchronizing snapshots
  2. Remaining members commit new events and then entities reply some results
  3. Snapshot synchronization on m2 completes and then reset its log
  4. The latest leader (m3) stops (or crashes)
  5. Member m1 becomes the new leader

Example:
moving-leader-during-snapshot-sync drawio
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@negokaz