[v22.2.x] fixed serialization of mixed failed and successful heartbeat replies #8913
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When there was one failed heartbeat reply in the array of heartbeat replies it might cause all other heartbeats to fail as the not initialized field for target node_id was used for all of the heartbeat replies. Heartbeat reply serialization uses a varint delta encoding to minimize the size of exchanged messages and de-duplicate information. Changed the way how the target_node_id field is selected for serialization. Instead of using just a first node we will use last one after the array of responses is sorted for delta encoding. After sort operation the largest value of `last_flushed_offset` is at the end of the array as not initialized value is a `model::offset::min()` if there is any other value available it will reside at the end of the array after the sort. Fixes: redpanda-data#8733 Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit e89d69a)
Signed-off-by: Michal Maslanka <michal@redpanda.com> (cherry picked from commit c294827)
rystsov
approved these changes
Feb 15, 2023
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Backport of PR #8781