[Backport stable/8.1] fix: take snapshot if nothing was exported since last snapshot #10625
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In cases where the log contains no entry at the snapshot position but a previous snapshot exists and taking a new snapshot is desirable because the processed position changed, verify that a new snapshot is taken that has the same term and index as the previous snapshot but a higher processed position. (cherry picked from commit 42ee7c6)
When figuring out where to take the next snapshot, we determine the snapshot position as the minimum of processing and exporter positions. There was an edge case where a leader could process but no export. In that case it'd use the exporter position as snapshot position and try and find a log entry at that position. If the log starts with the exporter position, for example because the same broker previously received a snapshot and compacted the log, no entry could be found which led to a failed snapshot. We now try and use the latest snapshot's term and index if the log entry could not be found. This ensures that new snapshots can be taken even if nothing was exported since the last snapshot. (cherry picked from commit ef090ab)
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bors r+ |
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👎 Rejected by too few approved reviews |
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Build succeeded: |
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Description
Backport of #10611 to
stable/8.1.relates to #9761