zbentley commented on issue #19210:
URL: https://github.com/apache/pulsar/issues/19210#issuecomment-1380739363
I work with @awitghirmai; we were investigating this together. This part of
the stats output seems impossible/like an invariant violation inside the broker:
```
"msgBacklog": 9,
"backlogSize": 0,
"earliestMsgPublishTimeInBacklog": 0,
```
If a subscription has a backlog that backlog must have a size and
oldest-message timestamp. If pulsar's internal state is updating those things
non-atomically that is a significant defect. That is, the act of adding a
message to the backlog must transactionally also update the backlog size and
earliest-timestamp if applicable: either all three of those things must succeed
and be observable globally at the same instant, or none of them must succeed.
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