GitHub user lhotari added a comment to the discussion: Does tiered storage 
offloading change message IDs?

> Is this an error or are there expected scenarios where message IDs become 
> invalid?

@haithir 

There have been some rare bugs in Pulsar and BookKeeper in the past where 
invididual entries get corrupted already in writing and become unreadable. 
That's why running on [a recent supported and maintained 
version](https://pulsar.apache.org/download/) is important for stability.

Another reason could be a case where bookies fail and the cluster doesn't have 
sufficient replication level to recover. That's why running with at least 2 
replicates (E=2,Qw=2,Qa=2) is recommended and paying attention to the bookie 
[autorecovery](https://bookkeeper.apache.org/docs/admin/autorecovery) state.

It always possible that there are also unresolved bugs that lead to transient 
errors where reading an entry fails. Which Pulsar version do you use?

GitHub link: 
https://github.com/apache/pulsar/discussions/23630#discussioncomment-11414388

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