[v24.1.x] s/disk_log_impl: don't prefix-truncate empty segments #19801
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Consider the following sequence of events: 1. there is a single segment in the log, with offsets [0-9] 2. we call prefix_truncate(10) 3. concurrently, another batch of 5 messages is being appended. 4. empty segment with base_offset=10, dirty_offset=9 is created 5. the appended batch is placed at offsets 10-14 Previously, the empty segment would have passed the dirty_offset check and (after waiting for the append to finish) would get deleted (including the data at offsets 10-14). Check also the segment base_offset to prevent that. Fixes redpanda-data#19632 (cherry picked from commit 963ff23)
ztlpn
approved these changes
Jun 12, 2024
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Backport of PR #19790
Fixes: #19800,